Sleep tracking · iPhone
Track your sleep with just your iPhone — or sync your Apple Watch. Sleep stages, heart rate, HRV, long-term trends, and a smart alarm. No account. No sign-up.
Inside the app
Sleep rings, iPhone tracking, Apple Health sync, long-term trends, and per-night tags.
← swipe or scroll to explore every screen →
Key features
Real sleep tracking, whether or not you own an Apple Watch.
Questions about SleepTracker? Here are the most common ones. If you don't see your answer, email us — we read every message.
Email us and we'll get back to you. Please include your iPhone model and iOS version so we can help faster.
Email support →Last updated: August 25, 2026. This policy applies to the SleepTracker iOS application published by Mark Utility Labs.
Short version: SleepTracker keeps your sleep and health data on your device. It reads from Apple Health only with your permission, uses the microphone on-device to estimate snoring — saving short snore clips only if you switch that on, and only to your own iPhone — and never uploads any of it. What does leave the app is anonymous and technical: a crash report when the app crashes, and a count of how the unlock screen is used. No ads, no advertising identifiers, no tracking you across other apps or websites, and no sale of your data, ever.
SleepTracker works with sleep and wellness data so it can show your nightly analysis:
All of this is created and used on your device.
If you connect Apple Health, the app reads your sleep analysis, heart rate, heart-rate variability, respiratory rate, and blood oxygen to display your sleep history. This data is read on-device and is not transmitted anywhere. You can review or revoke the app's access at any time in iOS Settings → Privacy & Security → Health → SleepTracker. SleepTracker writes back only the nights it measures itself: when you track a night with your iPhone, that night’s sleep is saved to Apple Health so it appears alongside the rest of your health data and is available to your other apps. Nothing you did not record with SleepTracker is ever written, and you can turn writing off in the same Settings screen.
If you use iPhone sleep tracking, the app measures the ambient sound level to estimate snoring and room noise during the night. That analysis happens on-device in real time, and only a numeric loudness value is kept with your night's summary.
Snore Recording is a separate, optional feature you control in Settings. When it is on, iPhone tracking also saves a 10-second audio clip each time snoring is detected — at most 30 clips a night, and at most 100 MB in total, after which the oldest nights' recordings are deleted automatically. These clips are written to the app's private storage on your iPhone. They are never uploaded, shared, or transmitted anywhere, and no one but you can play them. You can delete any clip, a whole night's clips, or every clip on the device at any time, and uninstalling the app deletes them all. Apple Watch nights never have snore audio, because the watch has no microphone the app can record from.
If you installed SleepTracker before this feature existed, Snore Recording starts off — the app will not save audio unless you turn it on yourself.
Your sleep sessions and settings are stored locally on your device using the app's on-device storage. Deleting a night inside the app removes it, and uninstalling the app removes all SleepTracker data from your device.
SleepTracker uses Firebase Crashlytics, a service run by Google, to report crashes automatically so bugs get found and fixed. When the app crashes, a report goes to Google containing the device model, the iOS and app version, the technical details of the crash, and a random identifier Firebase generates for your installation of the app. That identifier is not your name, your email, or your Apple ID; delete and reinstall the app and it changes. A crash report never contains your sleep sessions, your Apple Health data, or any snore recording.
When SleepTracker shows its unlock screen, it counts a short list of events through Firebase Analytics, also from Google: that the screen was shown (and which of its two asks it was), that the free week offered there was taken, which layout was shown, and that an unlock completed. These events carry no personal content — none of your sleep sessions, your Apple Health data, or any snore recording, no name, no contact details. SleepTracker never attaches your identity to them; Firebase records them against the same kind of per-install identifier described above. They exist so we can tell whether the unlock screen works, and for nothing else.
Apple handles the transaction itself. Mark Utility Labs never sees or stores your card details, billing address, or Apple ID password.
Your unlock is kept on your device, in the iOS Keychain. If you unlock the whole collection of Mark Utility Labs apps at once, that record is also kept in your own iCloud, using Apple's CloudKit, so it follows your Apple Account to a new device. It is stored in your private iCloud database, not somewhere we can browse. SleepTracker does not ask you to sign in to anything, and nothing about your purchase is sent to Google.
It's worth being explicit about the absences:
Google (Firebase) receives crash reports and the anonymous usage counts. Apple handles the transaction, and keeps the all-apps unlock record in your own private iCloud database. There are no other recipients.
The app requests these system permissions, each only when you use the related feature:
All are optional; declining one simply disables that feature.
SleepTracker is not directed at children under 13 and does not knowingly collect personal information from children. It never asks anyone, of any age, for a name, an email address, or any other identifying detail.
If this policy changes, the "Last updated" date above will be revised. Continued use of the app after an update constitutes acceptance of the revised policy.
Questions about this policy or your privacy? Please contact us at:
Mark Utility Labs
Email: mark@vibecode.review
Last updated: August 2, 2026. These terms cover the SleepTracker iOS application published by Mark Utility Labs.
Short version: SleepTracker runs on your device, needs no account, and shows you no ads. Use it however you like; just double-check anything critical.
SleepTracker is published by Mark Utility Labs for your personal use. It needs no account and no sign-up, it shows no advertisements, and your sleep data stays on your device.
Some features are unlocked by an in-app purchase. Any purchase is a one-time, non-consumable unlock — there is no subscription, nothing renews, and you are not charged again for what you have already unlocked. Purchases are processed by Apple through the App Store rather than by Mark Utility Labs, and refunds are handled by Apple under its standard App Store refund process at reportaproblem.apple.com.
SleepTracker converts times using the standard IANA time zone database, including daylight-saving rules. Those rules change, and software can contain mistakes. For anything critical — flights, interviews, court dates, launches — please confirm the time against an authoritative source. Mark Utility Labs is not liable for missed meetings, travel, or other losses arising from use of the app.
The app is provided "as is" and "as available", without warranties of any kind, express or implied, including fitness for a particular purpose.
Please don't reverse engineer, resell, or pass the app off as your own. That's the whole list.
If these terms change, we'll update the "Last updated" date above. Continued use after a change means you accept the updated terms.
Questions about these terms? Please contact us at:
Mark Utility Labs
Email: mark@vibecode.review
No company, no investors, no exit plan — just a retired dev, AI, and the growing conviction that this stuff should already cost almost nothing. I'm releasing a new app every week when the waves are bad and I'm not surfing.
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