Nocturnal Privacy Policy

Last updated: November 9, 2026

The short version

Nocturnal helps you track your sleep and recovery. The iPhone app keeps your data on your iPhone. It has no accounts, no ads, no tracking and no analytics, it contains no third-party advertising or analytics code, and it never sends your data to any server. We don't sell your data.

iPhone app

What it stores: the sleep times, naps, ratings, notes, dreams, workouts and profile details (age, weight, height, wake-up time) you enter. This is stored only on your device. The Nocturnal widget and Siri Shortcuts read the same on-device data and nothing else.
No account: the iPhone app has no sign-in and doesn't send your data anywhere.
Apple Health (optional): if you tap Sync from Apple Watch / Health or turn on auto-import, Nocturnal reads sleep and workout data from Apple Health after you give permission. If you turn on Save my sleep to Apple Health, Nocturnal writes the time you were in bed to Apple Health. Health data stays on your device, is never shared with anyone, and is never used for advertising or marketing. You can change or revoke access any time in Settings → Health → Data Access & Devices.
Microphone (optional, off by default): if you turn on Record sounds while I sleep, Nocturnal listens through the microphone while a sleep session you started is running. Sound is analysed on your iPhone, using Apple's on-device sound classification, to detect snoring, coughing, talking and loud noise. Nocturnal keeps a few short audio clips (about 8 seconds each) and a timeline of events on your device for 14 days, then deletes them. Audio is never uploaded or shared. You can delete saved clips at any time in Profile → Sleep goals & habits, or turn the feature off.
Wind-down sounds: relaxing sounds such as rain or ocean are generated on your device. They don't use any data.
Notifications (optional): a bedtime reminder and a weekly recap, scheduled on your device.
Export and backup: in Profile, Export & backup saves a CSV or backup file to a place you choose. What you do with that file is up to you.
Deleting your data: Profile → Export & backup → Delete all my data erases everything the app has stored, including sound clips, and resets your profile. Deleting the app also removes it. Data you saved to Apple Health stays in Apple Health until you delete it there.
Backups and losing data: your history lives only on your iPhone. If you delete the app or lose your phone without exporting a backup, it can't be recovered.

Web app

Account: you sign in with an email address and password. We store your email, your profile details, and the sleep, workout and dream entries you save, so they're available when you sign in.
Where it's stored: with our database provider, Supabase, and the site is hosted on Netlify. These providers process data on our behalf to run the service.
Who can see it: your entries are private to your account. We don't sell or share them, and we don't use them for ads.
Deleting it: Profile → Delete my data removes your sleep and workout history and profile. To delete the account itself, contact us below.
The web app does not record audio.

Children

Nocturnal is not directed at children under 13, and we don't knowingly collect their data.

Not medical advice

Scores, recommendations and tips are estimates based on general sleep guidelines and your own entries. They are not medical advice, diagnosis or treatment. If you're regularly exhausted despite enough sleep, snore heavily or have other concerns, talk to a doctor.

Changes

If this policy changes, we'll update the date above.

Contact

Questions or data requests: support.nocturnal.app@gmail.com