cykel

your body. your data. your device.

Private by design Encrypted on your phone. No accounts. No servers.
Predictions & fertility Track your cycle. See what's coming next.
Works offline forever Install once. Never needs internet again.
1
Tap the share button
2
Scroll down, tap Add to Home Screen
3
Tap Add — that's it

Open this link on your phone to install Cykel.

cykel

your body. your data. your device.

Tip: a few random words you'll remember beats a short complex password.

No recovery. Forget this passphrase and your data is gone forever. By design.

cykel

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Set a daily reminder Set a phone alarm for 9:00 PM to check Cykel — we can't send notifications without a server, and we don't use servers.

Tap a day to log how you're feeling

Track 2 cycles and Panda starts predicting your next period

Next period
Fertile window
Week

Conception tip
period
spotting
symptoms
predicted
fertile

Flow

Mood

Symptoms

Pain
Pain level
5
barely there send help
Digestive
Skin & Body
Discharge

Discharge Texture

Color

Sexual Activity

Drive

Lifestyle

Energy
Sleep
Exercise

Notes

Your Cycle

Log at least 2 complete cycles to see your stats

--avg cycle
--avg period
--shortest
--longest
Total cycles tracked--
Last period started--
Last period ended--

Cycle History

Common Symptoms

Common Moods

Creates a printable summary of the last 6 months

Doctor's Report

Settings

Mode

Birth Control

Current MethodNone
Type
History
Fertility WindowShow estimated fertile days on calendar
Face ID / FingerprintUnlock with biometrics
Auto-lock
5 min

Calendar Colors

Tap to customize your vibe

Period
Spotting
Symptoms
Predicted
Fertile
BackupDownload an encrypted .cykel backup file
RestoreRestore from a .cykel backup file
Import from FloImport a CSV export — processed on-device only

Support Cykel

Cykel is free, open source, and funded by people who believe reproductive health data should stay private. Send a tip to keep it that way.

feathersensible605709@getalby.com

Works with any Lightning wallet — Alby, Phoenix, Muun, Cash App, Strike

Danger Zone

Permanently deletes everything. There is no undo.

cykel v0.1.0 open source · zero tracking · on-device