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FAQ — MaxRecovery Timer for Pixel Watch & Android

Last updated / 最終更新: 2026-09-27 Contact / 連絡先: anraku.tech@gmail.com

🌐 言語 / Language: English / 🇯🇵 日本語

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This FAQ describes v1.0.0 (the 1.0.0 candidate; the phone app is 1.0.0-beta). If your screens look different, update both the watch app and the phone app from Google Play.

Contents: 1. Subscription & Billing · 2. Data and Privacy · 3. Usage & Features · 4. Troubleshooting · 5. Other

1. Subscription & Billing

Q. Do I need to buy Premium in the test version (closed testing)?
No. In the test version, all Premium features are free to use (no purchase needed). You have it when Settings → Premium shows the status “Premium active (test version)”. If it doesn’t, you have an older version: don’t buy Premium there; update the app from Google Play instead (purchases in older versions are charged). The Premium screen has no purchase buttons and shows the date the free access ends. After that date, the usual purchase screen comes back, and purchases are charged for real. The released version will require a purchase. If you have not bought Premium, it returns to the unsubscribed state once your app updates to the released version (your records stay). If you subscribed in an earlier version, the subscription keeps renewing and charging until you cancel, even while Premium is free in the test version. Cancel it with “Manage subscription (cancel, payment)” on the Premium screen.

Q. How much is Premium?
Premium is an auto-renewing subscription with a Monthly plan and a Yearly plan. Prices are loaded from Google Play and shown on the app’s Premium screen and on the Google Play purchase screen, in your local currency. First-time Premium subscribers get a free period (such as “Premium: first month free”). Google Play decides eligibility; if you are eligible, the free period is shown on the Premium screen and the purchase screen.

Q. What does Premium unlock?
Per-set recovery curves with the straight slope line for each set (the “Show slope lines” toggle, plus per-set slope (bpm/min), R² and lag), the advanced Analytics (HRR trend, recovery-slope trend, by-set-count / by-session-length averages, set-position HRR, the recovery-curve overlay, and the recovery summary), the PDF report (generated from the Analytics tab), CSV import/export, the heart-rate chart image in share + Save graph to Photos, the experimental new Afterglow value β (when you also turn it on in Settings → Experimental), the Premium app icon, and no banner ads. (The personal z-score / vs-previous comparison, the movement-quality score, the end-location map, the free overview cards (streak / best sessions / heatmap / map), and the basic per-session and Analytics analysis are free — see below.)

Q. What is free?
The heart-rate chart with phase bands, the absolute Afterglow score, the per-set breakdown, the Detailed data card (Max / Min / Avg HR, HR drop, HRR1 / HRR3 / HRR5), the history list (left-swipe a row to reveal a trash button, then tap it to delete a single session), the personal z-score (個人比) and vs-previous (前回比) comparisons, the movement-quality (Flow) score, the end-location map with venue-name entry (nearby-venue search up to 5 times a day), the basic Analytics (Afterglow-over-time, by-mode average, and the period summary), sharing the heart-rate graph as text, watch-settings editing, and the Force-English toggle. The free overview cards in the Analytics tab (current / longest streak and total count, the Best Sessions TOP 10, the visit-frequency calendar heatmap, and the Venue Map of your visited venues) are also free, as are the Sleep score and the resting-HR reference line when you connect Health Connect.

Q. Is watch ↔ phone sync Premium?
No. Finished sessions transfer from the Pixel Watch to your Android phone automatically over the Wearable Data Layer, for everyone. The optional Google Drive cloud sync (see “How does cloud sync / backup work?” below) doesn’t require Premium either (it is rolling out gradually and may not yet be available for your Google account).

Q. Where do I subscribe?
Open Settings → Premium → “Upgrade to Premium”, or tap “See Premium” on the locked recovery curve, advanced Analytics or CSV import/export, to reach the Premium screen, then tap the button for the Monthly or Yearly plan. If you’re eligible for the free period, the button reads “Start … free, then …”; otherwise it reads “Subscribe for …”. The price after the free period, automatic renewal and how to cancel are shown right next to each plan’s button.

Q. How does auto-renewal work?
When the free period ends, your subscription automatically becomes a paid subscription at the plan’s price and renews every month (Monthly plan) or every year (Yearly plan) until you cancel. If you cancel in Google Play before the next renewal date, you are not charged for later periods. Cancel during the free period and you won’t be charged.

Q. How do I switch between the Monthly and Yearly plans?
Open Settings → Premium → “Premium member (view or change plan)” and tap “Switch to yearly” or “Switch to monthly”. The new plan starts right away and the new price applies from your next billing date. (Plans can’t be changed from the Google Play Store’s subscription screen.)

Q. How do I cancel?
In the app, open the Premium screen from Settings → Premium and tap “Manage subscription (cancel, payment)”. This opens the app’s subscription in Google Play; tap Cancel subscription there. To start from the Google Play Store instead: tap your profile → Payments & subscriptions → Subscriptions → this app’s subscription (Google Play currently shows it under its former name, “MaxSauna Premium（月額）”) → Cancel subscription. After canceling, you keep Premium features until the end of the period you’ve paid for.

Q. Does canceling delete my data?
No. Your sessions, history, and settings all stay (they are stored locally on each device). Only the Premium features (recovery curves and slope lines, the advanced Analytics, the PDF report, CSV import/export, the HR-graph image share / save, the β experimental value, the Premium app icon, ad-free) revert to the free tier. If you used the Premium app icon, it switches back to the default after Google Play confirms that Premium has ended, when you leave the app (for example, go to the home screen). If you subscribe again and the setting is still on, the Premium icon comes back.

Q. It says “Your subscription is on hold”.
Your subscription is on hold because of a payment problem or because it’s paused, and Premium isn’t available until it’s resumed. Tap “Open Google Play (payment, resume)” in Settings or on the Premium screen, then update your payment method or resume the subscription in Google Play; Premium comes back once it’s active. During a payment grace period you keep Premium, and Google Play asks you to fix your payment method.

Q. I paid but Premium isn’t active on a new device.
Make sure you’re signed in to Google Play with the Google account you used to subscribe, then open the Premium screen from Settings → Premium and tap Restore purchase to re-check your Google Play entitlement.

Q. Can I use Premium I bought on the iPhone version?
No. Premium on the iPhone version (App Store) and on the Android version (Google Play) are separate purchases and don’t carry over to each other.

Q. Refunds?
Google handles all refund requests for Google Play purchases. Use your Google Play order history at play.google.com.

2. Data and Privacy

Q. What data do you collect?
The developer does not collect, receive, or store any of your data. There is no server and no account. Session data, heart-rate data, and locations are stored on your devices (and, if you use cloud sync, in your own Google Drive) and are not sent to the developer. Note that showing maps and searching for nearby venues sends the session’s end location to Google. For ads in the free version (AdMob), see the question below.

Q. Where is my data stored?
By default, locally on your Android phone and your Pixel Watch (local JSON files). When the two are paired, finished sessions transfer Watch → Phone directly over the Wearable Data Layer (Bluetooth / Wi-Fi); the watch keeps each session and resends it until the phone confirms it was received. Watch settings sync bidirectionally, so you can edit watch settings from the phone (if you change them on both, the newer change to each item is kept). There is no developer server and no login to the developer. Optionally, you can turn on Cloud sync (Google Drive) to back up a snapshot of your sessions to your own Google Drive (it is rolling out gradually and may not be available for your account) — see “How does cloud sync / backup work?” below. Cloud sync is off until you sign in and tap Sync. Note that if Android backup is on for your phone, Android may back up a copy of the app’s data to your Google Account (see “What if I delete the app?” below).

Q. How does cloud sync / backup work?
Cloud sync is optional and free (note: it is rolling out gradually and may not yet be available for your Google account). In Settings → Cloud sync (Google Drive) you tap Sync with Google Drive: the app signs you in with Google and uses the drive.appdata permission to store and retrieve a snapshot of your sessions in your own Google Drive — in its app-private, hidden “App Data” folder under your Google account. The purpose is to back up your sessions and move them between devices; sync is two-way and merges by session. Syncing happens when you tap the button (not automatically). If the cloud data can’t be fetched or read, or if saving would reduce the number of sessions in the cloud, the app stops without changing the cloud and tells you why. Deletions are synced too (see the next question). If you sync two or more devices, update the app on all of them before syncing. Importantly, the developer still operates no server and stores nothing: your data goes to your own Google Drive, not to the developer, and the developer cannot access it. It stays off until you sign in / tap Sync — if you do not use it, your data stays on your devices (Watch ↔ Phone over the Wearable Data Layer) exactly as before. You can delete the synced data from your own Google Drive at any time, and revoke the app’s access whenever you like by deleting its connection in your Google Account → Security → “Your connections to third-party apps & services” (the app itself has no disconnect setting).

Q. Are deleted sessions also removed from the cloud and my other devices?
Yes. Both a single-session delete (left-swipe → trash) and Settings → Data → “Delete all received data” are applied, if you use Google Drive sync, to the cloud and your other synced devices at the next sync. Deleted sessions don’t come back from a watch resend or from Drive sync (the app keeps only each deleted session’s ID and the time it was deleted, to keep it from coming back). To bring sessions back, restore them explicitly with CSV import (Premium); the restore also reaches your other devices at the next sync. Devices running an older version of the app can’t read the deletion records, so deleted sessions stay on those devices — update the app on all of them.

Q. What if I delete the app?
Data is stored on-device by default, so deleting the app removes its data from the device. However, if Android backup (backup to your Google Account) is on for your phone, Android may have backed up the app’s data (such as your sessions, deletion records and settings) automatically, so your sessions may come back when you reinstall the app with the same Google Account or move to a new phone (the watch app’s data may likewise be included in the watch’s backup). That backup is handled by Google and is separate from the app’s Cloud sync (the developer can’t access it). If you don’t want the restored sessions, delete them from History or with Settings → Data → “Delete all received data”. To keep your records, export them as CSV in Settings → Data import/export (CSV) before deleting the app, and keep the files off the device (for example on a computer or in cloud storage); you can import them after reinstalling (CSV import/export is a Premium feature, free in the test version). If Cloud sync (Google Drive) is available for your account, syncing before you delete the app also lets you bring your sessions back by syncing again after reinstalling (it is rolling out gradually and may not be available).

Q. Where does the heart rate come from?
The app reads heart rate live from the Pixel Watch’s optical sensor via Wear OS Health Services (the watch’s workout feature) during a session. If heart rate can’t be read (no heart rate permission, no sensor, no readings, etc.), the watch keeps timing without heart rate and shows “Heart rate unavailable”. On the phone, that session is marked “No heart-rate data (reason)” and is not used for scores (see below). Optionally, if you connect Health Connect (Settings → Health Connect, with your permission), the app can also read your Resting heart rate and draw it as a reference line on the session HR chart, and export your sessions to Health Connect as exercise + heart-rate records with “Export sessions to Health Connect” in Settings, so other apps can use them (export is manual, not automatic, and exporting again never creates duplicates). Health Connect is entirely optional — if you do not connect it, the app works exactly as before with no health-data integration.

Q. What is the Sleep score / Next-day status?
If you connect Health Connect and you have sleep data recorded there, the session detail can show a Next-day status section for the night after a session: a reference Sleep score (free) and your average respiratory rate for that night, read from Health Connect. These are reference values only and require both Health Connect to be connected and sleep data to be present — if either is missing, the section simply does not appear.

Q. Does the free version share my data with advertisers?
Without Premium, the app shows an AdMob banner ad. Ad-network data handling follows Google’s policies and your device’s privacy settings (Android advertising-ID controls under system Settings → Privacy → Ads). In the EEA, the UK and Switzerland, the app shows Google’s consent form (UMP) before ads are loaded. Where the law requires it, such as in some US states, you can choose how your data is used for ads (see the next question). Heart-rate, location and Health Connect data are never used for ads or given to ad networks. Premium removes ads. See the Privacy Policy for details.

Q. How do I change my ad consent (privacy settings)?
Use Settings → Help & legal → “Ad privacy settings”. This item appears only where a way to change consent or opt out is required, such as the EEA, the UK, Switzerland and some US states (it normally doesn’t appear in Japan). To reset or delete your advertising ID, use Android Settings → Privacy → Ads.

3. Usage & Features

Q. What is the Afterglow Score?
A 0–100 score estimating how quickly your parasympathetic nervous system (“rest mode”) engages after a sauna session, derived from your heart-rate recovery (HRR1 / HRR3 / HRR5). It puts a number on what Japanese sauna culture calls “totonou”. The absolute score, the personal z-score (個人比) and the vs-previous (前回比) comparisons are all free; the experimental new Afterglow value β is Premium (and only when you turn it on in Settings → Experimental). Reference value only — not a medical metric.

Q. Can I use the app without a Pixel Watch?
No. Timing and heart-rate measurement run in the watch app, so a Pixel Watch (or other Wear OS smartwatch) is required. The phone app is for reviewing and analyzing the sessions sent from the watch.

Q. How do I control the timer with wet hands during a session?
Use the rotary crown: rotate up to advance to the next phase, rotate down to pause. To resume, rotate up again. During a running session the screen does not respond to touch (to prevent wet-hand misfires) — the crown is the only control, on every watch. While paused, an on-screen menu appears with Resume / Back / End. If you prefer touch controls, turn on Settings → Watch settings → “Show control buttons” to also show Next/Pause buttons during a running session. There is also an optional “Double-tap to advance” gesture (beta, OFF by default). On Pixel Watch 3 and later you can also try two experimental gestures in the watch’s settings (both OFF by default; see below): “Use Double pinch (beta)” to advance with a double pinch (tap your thumb and index finger together twice), and “Wrist turn to pause (beta)” to pause and resume by turning your wrist. Phase times are haptic alerts only — the app does not auto-advance, so you choose when to move on. When a confirmation or warning appears, turning the crown (either way) closes it too (it cancels a confirmation and continues on the inactivity warning, without changing phase); End is tap-only.

Q. The second “Next” in a row doesn’t respond.
To prevent skipping two phases by accident, a Next within 1 second of the previous input is ignored, whether it comes from the crown, the Next button, the body double-tap or any other input. Also, the crown works as one turn, one phase: keeping on turning doesn’t advance a second phase. To advance again, stop and wait at least 1 second.

Q. Can I use double pinch?
You can try it as an experimental feature on Pixel Watch 3 and later (Wear OS 7); it’s OFF by default. On the watch, go to the MaxRecovery home → Settings → Options → “Use Double pinch (beta)” and turn it on. The option only appears when hand gestures (double pinch) are turned on in the watch’s own system settings. When it’s on, a Next button is shown while running and a double pinch presses it (the button can also react to wet fingers or water drops). If it doesn’t respond well, the crown works as usual. While it’s on and double pinch is available, “Double-tap to advance” isn’t used.

While it’s off, the app doesn’t accept double pinch (it won’t close a confirmation or save a rating, for example). However, if “Double-tap to advance” is on, the finger movement of a pinch may be picked up and advance to the next phase. If that bothers you, turn “Double-tap to advance” off.

Q. Can I pause with a gesture?
As an experimental feature on Pixel Watch 3 and later (Wear OS 7), you can pause and resume with a wrist turn; it’s OFF by default. On the watch, go to the MaxRecovery home → Settings → Options → “Wrist turn to pause (beta)” and turn it on. The option only appears when wrist turn is turned on in the watch’s own system settings. When it’s on, turning your wrist (a quick turn outward and back) pauses a running session and turning it again resumes. On a confirmation (end, go back, final-set choice) it cancels. It doesn’t close heart-rate alerts or the inactivity warning (so you don’t miss them). So that one movement can’t pause and then resume, a wrist turn within 1 second of the previous wrist turn, or of pausing/resuming with the crown or a button, is ignored. If it doesn’t respond well, the crown works as usual (down to pause, up to resume). Double pinch and the body double-tap only advance (Next); they don’t pause. However, if “Double-tap to advance” is also on, the wrist movement may be picked up and advance to the next phase. If that bothers you, turn one of them off.

Q. Turning my wrist shows “End session?”.
In the latest version, while “Wrist turn to pause (beta)” is off (the default), wrist turn is disabled during a session (Pixel Watch 3 and later; it doesn’t close confirmations or alerts either). While it’s on, a wrist turn pauses/resumes or cancels a confirmation, and never opens the end confirmation (see the question above). Outside a session (home, settings and so on), wrist turn stays the system’s Back. If the confirmation does appear, close it by turning the crown (either way) or by tapping Cancel; the session keeps running. Even in earlier versions, that confirmation closes by itself after 5 seconds and the session doesn’t end unless you tap End. Please update the app.

Q. Can I use the system “Water Lock” during a session?
It’s best not to. Wear OS Water Lock is exited by turning the crown, so while it’s on the crown can’t change phase or pause either. The app already ignores screen touch during a session (to prevent wet-hand / splash mis-taps, except for buttons such as Next), so Water Lock isn’t needed — leave it off and just use the crown.

Q. Does recording keep running in the background during a session?
The session runs in a foreground service with an ongoing notification. While a session runs, an ongoing-activity icon appears on the watch face, and the session keeps running if you go back to the watch face or the screen turns off (tap the icon or the notification to return to the session screen). While the session screen is shown, the display is kept on by default. However, without the Heart rate permission the foreground service can’t run, so recording may stop when the screen turns off (the watch tells you). Also, when the watch’s workout feature can’t be used (for example while another app is recording a workout), heart rate may stop while the screen is off. Keeping the session screen open during a session is recommended.

Q. How is the elapsed time shown, and what happens when the screen dims?
While the screen is on, the current phase’s elapsed time shows tenths of a second (e.g. “01:18.4”, with the tenths in smaller type). The total time shows seconds (e.g. “Total 18:40”). If the screen dims (for example when you cover it with your palm), the app does not go back to the watch face; it shows a low-power view on a black background with the phase name, the elapsed time in whole minutes (e.g. “8 min”; “0 min” for the first minute) and the heart rate. This view refreshes about once a minute, which is why it shows whole minutes (the heart rate is also the value at that moment). The gauge, chart and battery are hidden while the screen is dim. Tap the screen or turn the crown to bring back the full view with tenths right away. While the screen is dim, a tap or crown turn only wakes the screen: it never moves to the next phase or pauses (if you woke it with the crown, pause briefly before turning again). On other screens (home and so on), the dimmed view shows only the time.

Q. Can I interact with the heart-rate chart?
Yes — the HR chart is interactive. Tap a point to see a value card showing the bpm, the elapsed time, and the phase at that point. Pinch to zoom in up to 20×, drag to scroll along the timeline, and double-tap to reset the view.

Q. Can I add moving-average lines or hide the preparation phase on the chart?
Yes. In Settings → Display you can toggle two trailing moving-average overlays on the HR chart — “Show 60s moving average” and “Show 10min moving average” — each independently. There is also a “Hide prep phase from chart” toggle that re-bases the X axis so 0:00 is your sauna entry. All three default to OFF.

Q. What’s the difference between Standard and Simple mode?
Standard mode tracks distinct phases (Sauna → Cold bath → Cool-down) per set, with per-set times and HR thresholds, plus an optional Prep phase and an optional extra phase. Simple mode doesn’t split the cold bath and cool-down into phases: at each set break you move to the next set yourself (rotate the crown up, or use the Next set button). There is no set limit; to finish, pause and tap End. One sauna time and one pair of HR thresholds apply to every set, and the Prep phase can be used too. On the phone, the per-set breakdown and the recovery curves are found from your heart-rate peaks.

Q. What is HRR (HRR1 / HRR3 / HRR5)?
HRR = Heart Rate Recovery. HRR1 is your heart-rate drop 1 minute after the peak, HRR3 at 3 minutes, HRR5 at 5 minutes. Higher means faster recovery, which is the basis for the Afterglow Score.

Q. What is the recovery slope?
A Premium analytics metric (bpm/min) — the slope (β) of the linear-fitted central portion of your recovery curve. Steeper means faster recovery.

Q. What is the Movement Quality score?
A score (0–100, Excellent / Good / Average / Needs work) that measures how many heart-rate spikes occur after each sauna peak. Long walking distances between sauna → cold water → cool-down area cause HR rebounds; fewer spikes = better facility flow. The per-session score is free in the session analysis; the detailed breakdown and the period-average (in the Premium PDF report) are Premium.

Q. What is in the History tab?
The History tab is now just the session list. Tap a row to open that session’s full analysis. Left-swipe a row to reveal a trash button, then tap it to delete that single session (no confirmation dialog — deletion is immediate); this is the only per-session delete. The free overview cards (streak, best sessions, heatmap, map) have moved to the Analytics tab — see below.

Q. Where did the streak / best / heatmap / map overview go?
Free. Those overview cards moved from the History tab to the Analytics tab. The app shows your current and longest streak plus your total session count, a Best Sessions TOP 10 ranking (by Afterglow score), a visit-frequency calendar heatmap, and a Venue Map that plots all of your visited venues on one map. These are all free and live in the app (no Premium and no PDF required).

Q. How do I delete a single session?
In the History tab, left-swipe the session row to reveal a trash button, then tap the trash button to delete just that one session. There is no confirmation dialog — deletion is immediate. This left-swipe is the only per-session delete. If you use Google Drive sync, the session is also removed from the cloud and your other devices at the next sync.

Q. How do I generate a PDF report?
Premium feature. From the Analytics tab, generate the report and share it via the Android share sheet (file name MaxRecovery_Report_<start>_<end>.pdf). An A4-portrait, 3-page report is produced:

Sessions without heart-rate data are not used for the score and recovery-curve pages; they only appear in the recent-sessions table. The Best Sessions ranking and the visit/calendar heatmap are also available free in the Analytics tab (TOP 10 there); the PDF still includes its own versions as part of the exported report.

Q. What is in the Analytics tab?
The Analytics tab is partly free. Free: Afterglow-over-time, average Afterglow by mode, the period summary, and the free overview cards (current / longest streak and total count, Best Sessions TOP 10, the visit-frequency heatmap, and the Venue Map). Premium: the HRR trend (1/3/5), the recovery-slope trend, average Afterglow by set count / by session length, set-position HRR, a recovery-curve overlay, the recovery summary (avg HRR1/3/5, best set position, best HRR1, recovery completeness, time-to-bottom, front-loading), and the PDF report button. A period filter (All / 30 days / 7 days) is available to everyone.

Q. Can I save or share the heart-rate graph image?
Free: the Share button on the heart-rate chart shares text only (basic info). Premium: “Save graph to Photos” + “Share graph” share detailed text plus a PNG image of the HR chart; you can choose “Info + HR graph” or “HR graph only”. Saved images (MaxRecovery_<date-time>.png) go to your device’s own Photos (Pictures/MaxRecoveryTimer) — nothing is uploaded. Images saved with earlier versions stay in Pictures/MaxSaunaTimer (they are not moved).

Q. The CSV file names changed.
With the new app name, exported files are named maxrecovery_*.csv (sessions), maxrecovery_sets_*.csv, maxrecovery_phases_*.csv and maxrecovery_hr_samples_*.csv (the same as the iPhone version; * is the export date and time). The columns haven’t changed, and files exported by earlier versions (max_sauna_*.csv) can still be imported. You can rename a file on the save screen, and after exporting the app shows the name of the saved file.

Q. What are the recovery-curve slope lines?
Premium feature. On the per-set recovery curve the app overlays a straight slope line for each set, with a “Show slope lines” toggle and a per-set legend showing the slope (bpm/min), R², and lag (seconds). Dashed 1-minute and 3-minute guide lines are also drawn.

Q. What is the “Detailed data” card?
Free. In the session detail the Detailed data card shows your Max HR, Min HR, Avg HR, HR drop (peak − min), and HRR1 / HRR3 / HRR5 for that session.

Q. What is the experimental new Afterglow value (β)?
β is an experimental new Afterglow value. It is shown only when you are Premium AND you turn on Settings → Experimental → “Show new Afterglow value (β)”. On the free tier it is not shown at all and the Experimental section is hidden.

Q. What is the Premium app icon?
A Premium-only option. In Settings → Premium, “Use Premium app icon” switches your home-screen app icon to the Premium version. The icon doesn’t change the moment you switch the setting; it changes when you leave the app (for example, go to the home screen), and may take a few seconds. If you placed the icon on your home screen, you may need to add it again. When Premium ends (including when the free access in the test version ends), the icon switches back to the default when you leave the app.

Q. The self-rating ★ I entered on the watch — where does it show?
In the session detail header, e.g. “Standard • 2 sets • 58min • ★5”.

Q. How does the venue / map work?
Free. If Location permission is granted, the app captures the session end location once when the session ends and shows it on a Google Map in the session detail. You can set the venue name in these ways:

There is no continuous GPS tracking. Each session can also have a 1–5 star rating.

Q. Why doesn’t tapping a suggestion fill in the venue name?
Because the Google Maps Platform terms don’t allow the app to store venue names from Google’s suggestions. Suggestions are shown for reference only, and the app saves only the venue names you type in (the suggestion list itself is never saved on your device; it is kept in memory for up to 30 minutes). Once you have typed a name, it appears under “Your past venues” for nearby sessions (within about 500 m), ready to set with one tap.

Q. Is there a limit on nearby-venue searches?
Yes — 5 per day per device (Premium included). The count resets when your device’s date changes. A search that finds no suggestions still counts as one. If you reopen a session at the same place within 30 minutes, the previous suggestions are shown again without using a search (they can be cleared sooner, for example when the app is fully closed). If the app-wide daily search limit is reached, the app tells you so and shows when search will resume. Either way, you can type the venue name in with “Enter venue name”.

Q. The venue names I set earlier are gone.
Venue names picked from suggestions in earlier versions can’t be stored under Google’s terms, so they are removed the first time the updated app starts (the app tells you how many, once). You can add them again by typing. Venue names imported from CSV are removed too, because earlier versions couldn’t tell them apart from picked suggestions — import the CSV exported from the iPhone app again to bring them back (CSV import/export is Premium).

4. Troubleshooting

Q. Watch session data isn’t reaching my Android phone.
Open the MaxRecovery Timer app on both devices, keep them nearby with Bluetooth (or Wi-Fi) on, and relaunch both apps. The watch keeps each session until the phone confirms it was received and resends it automatically once they reconnect (the phone app also picks up sessions it missed when it starts). If there is still no confirmation after 1 hour, the watch history marks the session “Not on phone yet”. If the watch home screen says “Update the phone app to receive N session(s).”, the phone app is too old to receive long sessions — update it from Google Play and the sessions arrive automatically.

Q. Heart rate isn’t showing on the watch.
Make sure the watch is worn snugly and that the Heart rate permission is allowed. When heart rate can’t be read, the heart-rate field shows “—” (the last reading is more than 10 seconds old) or “♡×” (unavailable), and a “Heart rate unavailable” notice appears. The timer keeps running and the session is recorded without heart rate. If the permission is off, allow “Heart rate” (“Sensors” on earlier watch software) in the watch’s Settings → Apps → MaxRecovery Timer → Permissions (if you declined only once, the “Before you start” screen asks again when you start a session).

Q. The watch says “Unfinished session”.
If the app stopped unexpectedly during a session, the session kept restarting, or the last save was more than 60 minutes ago, the watch asks instead of resuming automatically. Tap Continue to resume, Save to save what was recorded and end, or Discard to throw that session away.

Q. Watch battery drains during a session.
While a session screen is on, the display is kept awake and a foreground service runs so the timer and heart-rate keep running, which uses more battery than an idle watch (if the screen dims, the session stays on screen in a low-power view). The app auto-ends after 60 minutes with no input (it warns first, then auto-ends) to protect the battery; you can turn this off with Settings → Watch settings → “Auto-end after 60 min idle” (on by default). There is also an optional low-HR warning during cold water / cool-down.

Q. The Afterglow Score didn’t appear after my session.
The score needs valid heart-rate data after the peak. If you ended the session within 1 minute of the sauna peak, or the watch lost contact (dropouts), the score may be missing. Sessions with too few samples are marked as unscored. Sessions where the watch couldn’t read heart rate are marked “No heart-rate data (reason)” and are not used for the Afterglow Score, personal comparisons, recovery curves, trends or the PDF report (they still count toward visits, total time and streaks).

Q. A red banner says the history file couldn’t be read.
Your phone’s history file (or some records in it) was damaged and couldn’t be read, so the app set it aside and kept it instead of overwriting it. Tap “Export the set-aside file” on the banner and choose where to save it. Set-aside files are also listed under Settings → Data import/export (CSV) → “Set-aside history files”, and you can export them without Premium. Attaching them when you contact support helps us investigate. If the banner asks you to restart the app, please do so.

Q. Health Connect has duplicate sessions / names still say “Sauna”.
The latest version never creates duplicates, however many times you export. Records exported by earlier versions may be duplicated and keep the name “Sauna” (the latest version names records without a venue “MaxRecovery”). Tap Settings → Health Connect → “Clean up duplicates from earlier exports”: for the time ranges of the sessions on your phone, the exercise and heart-rate records this app exported earlier are deleted and exported again. Data from other apps is not affected. Records of sessions you deleted from the phone remain; delete them in Health Connect if you don’t need them.

Q. The resting-HR line, Sleep score, or Next-day status isn’t showing.
These come from Health Connect. Make sure you connected it in Settings → Health Connect and granted the relevant read permissions, and that the data exists there (a recorded resting heart rate, and sleep data for the night after the session). If Health Connect is not connected, or the data is missing, those items simply do not appear and the rest of the app is unaffected.

5. Other

Q. Can I switch the app to English?
Yes. Both the phone app and the watch app are available in English and Japanese. The phone app follows the phone’s language setting, and the watch app follows the watch’s own language setting (on both, languages other than Japanese show English). Turn on Settings → Display → “Force English” on the phone to show both the phone and the watch in English regardless of their language settings (if you switch it while a session is running on the watch, the watch changes after the session ends).

Q. Can I use this for medical purposes?
No. The Afterglow Score, heart-rate values, HRR, the Sleep score, and all other figures are reference information only. They are not medical metrics and must not be used for diagnosis or treatment decisions. Consult a physician if you have concerns.

Q. What is the recommended use?
Personal wellness tracking. Go at a pace that suits how you feel, and follow the venue’s rules. Avoid using it after drinking alcohol. Follow the manufacturer’s guidance on where to wear your watch.

Q. How do I contact support?
Email anraku.tech@gmail.com. Please include your Android / Wear OS versions and a brief description of the issue.

Q. Where can I find the Privacy Policy and Terms of Use?
Privacy Policy / Terms of Use.

関連 / See also