KnowSleep
Sleep insights, not just data
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Your watch says how you slept. KnowSleep says why — last night read back as a paragraph, with one thing to try tonight. When the nights do not add up yet, it says so.
KnowSleep does not measure your sleep, and it does not upload anything. It reads the night your Apple Watch has already written into Health, and explains it on your iPhone.
One reading, every morning
How long you slept, how much deep sleep, when you fell asleep, how often you woke — each compared against your own usual figures, then read back as one conclusion. Add a note that you had coffee in the afternoon or were on your phone in bed, and the reading takes it into account.
Only you, against you
No "you sleep worse than 80% of people your age". Every comparison is to the median of your own recent nights. What counts as a lot of deep sleep, or as an early bedtime, is settled by your records alone.
A sleep score you can open up
Duration, bedtime consistency and night-time interruptions: how much each is worth, and what this night earned on each. Anything that could not be measured is left out rather than scored as zero.
Trends by week, month, quarter, year — or any range you pick
Seven metrics over any stretch of time. Tap any night to open that night.
Reports (KnowSleep Pro)
Weekly, monthly, quarterly and yearly: a whole stretch of nights read as one, compared with the stretch before it, and checked against the behaviours you tagged — "on the 12 nights you tagged coffee, median deep sleep was 18 minutes lower". That takes enough nights to say honestly; when there aren't enough, KnowSleep says so instead of inventing a conclusion.
Your data stays on the device
No server, no account, no analytics SDK. Every calculation happens on this iPhone. Everything can be exported as a single JSON file, or erased in one tap.
What you need
An iPhone running iOS 17 or later. Sleep stages and overnight heart rate need an Apple Watch worn to bed; without one the app still works, reading bedtime and time in bed. The watch needs Sleep Focus turned on, or watchOS records no sleep stages at all.
KnowSleep reads sleep habits. It is not medical advice and makes no diagnosis. See a doctor about anything that persists.
About the subscription
Every night's own data, score, charts and daily reading are free for ever. KnowSleep Pro unlocks the periodic reports, as a yearly subscription (with a 7-day free trial) or a one-time lifetime purchase. A subscription renews within 24 hours of the end of the period and can be turned off any time in Settings – Apple ID – Subscriptions; the lifetime purchase is paid once and does not renew.
Terms: https://knowsleep.soakout.com/terms.html
Privacy: https://knowsleep.soakout.com/privacy.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
This release changes what the reports say.
The weekly report now contrasts your best nights with your worst, and speaks only when the two groups' bedtimes are fully separated.
Tag contrasts gained a tier: with at least 3 nights on each side you get the arithmetic comparison, stated with both counts. It claims no statistical significance — it puts the two numbers side by side.
Attribution now reads your full history, while the description still covers only the window you chose. When the nights do not add up, it says it is still watching rather than reaching for a conclusion.
Also: a locked finding no longer invites you to share it.
The developer, 北京丈量世界科技有限公司, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Beijing Zhang Liang World Technology Co., Ltd.
- Size
- 46.3 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Simplified Chinese
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Lifetime $39.99
- Yearly $24.99
- Copyright
- © 2021 Beijing Zhang Liang World Technology Co., Ltd.