onSleep: Bedtime Sleep Tracker

onSleep is a simple sleep tracker and sleep diary. Tap once at bedtime, tap again when you wake up, and see exactly how you slept.

No wearable needed. No account. Your sleep log stays on your phone.

Why a sleep diary works

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Most people cannot say how much sleep they actually got last week. A sleep diary fixes that. Log every night and every nap, rate how you felt, and the pattern shows up on its own: the late bedtime that costs you an hour, the weekend lie in that wrecks Monday, the nap that actually helped.

If you are dealing with insomnia, a rotating shift schedule or jet lag after a long flight, a written sleep log is the first thing that shows you what is really going on.

What the sleep tracker records

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• One tap sleep and nap logging, no wearable required

• Daily sleep score from 0 to 100, colour coded by quality

• Sleep stages: light sleep, deep sleep, REM and time awake

• Sleep debt calculator, so you can see how many hours you are behind

• Sleep cycle timing and a consistency gauge for your bedtime

• Calendar heatmap of your full sleep history

• Weekly and monthly trend charts

• Quality rating from 1 to 5 stars with notes on every night

• Health Connect sync to import sleep from a watch or band

• CSV and JSON export of your entire sleep log

Bedtime and morning reminders

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onSleep sends a gentle wind down reminder before your target bedtime and a friendly note in the morning. No sirens, no guilt, no streak you have to defend. Just a nudge that keeps your sleep routine steady.

Set your own sleep goal, bedtime and wake time, and change them whenever your schedule changes.

Built for real schedules

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• Night shifts and rotating rosters

• Jet lag after travelling across time zones

• New parents sleeping in fragments

• Students and anyone whose bedtime drifts later every week

• Anyone who naps and wants naps counted properly

Private by default

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Every sleep record stays on your device. No cloud upload, no account, no data selling, no ads. It is a sleep tracker that works completely offline. Export your sleep diary or delete it whenever you like.

onSleep PRO

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Unlock full history, advanced analytics, pattern detection and unlimited export with onSleep PRO. Everything else, including unlimited sleep and nap logging, is free.

Available in 24 languages.

Start tonight. Tap the moon, go to sleep, and tomorrow morning you will have the first entry in your sleep diary.