Wren: Private Period Tracker

Opus Lab

In-app purchases

About this app

Wren is a period and cycle tracker built around one promise: your data stays on your phone.

No account. No cloud. No ads. No tracking. What you log stays with you — always.


▸ WHY WREN

Most period trackers ask you to sign up, then quietly send your intimate data to advertisers, insurers, or worse. Wren was built differently. There's no server. There's no account. There's genuinely nothing to leak, because your cycle data never leaves your device.

Wren is a beautiful, offline period tracker for anyone who wants a private cycle app they can actually trust.


▸ EVERYTHING YOU NEED — FREE

- Log period days with a single tap
- Backdate previous periods you forgot to log
- Track flow, symptoms, mood, and personal notes
- Predict your next period and fertile window
- Warm cycle-phase guide: menstrual, follicular, ovulation, luteal
- Gentle daily messages that meet you where you are
- Full calendar view — see months at a glance
- Insights: cycle length, regularity score, history chart
- Doctor-ready PDF report for appointments
- CSV export you can save anywhere
- Offline period reminders (no internet needed)
- Runs 100% offline. Works with airplane mode on.


▸ WREN PRO — OPTIONAL, ONE-TIME UNLOCK

Pay once. Yours forever. No subscription. No hidden fees.

- App Lock — PIN and biometric protection
- Encrypted backup you control (save to your Drive, Files, anywhere)
- Unlimited custom symptoms and tags
- Beautiful calendar themes
- Support a genuinely private app


▸ FOR EVERYONE

Whether you're tracking your first cycle, trying to conceive (TTC), managing PCOS, watching for irregularity, or simply wanting to understand your body — Wren is here as a quiet, warm companion.

Wren is not a medical device. Predictions are estimates, not medical advice. Not a method of contraception. If you have health concerns, please speak with a doctor.


▸ TRUE PRIVACY, BY DESIGN

We can't see your data because we never collect it.
We can't sell it because it never leaves your phone.
We can't lose it in a breach because we don't have a server.

That's what "private" should mean.


Your body. Your data. Your Wren.

What’s new

Wren is here.

A private period and cycle tracker built around one promise: your data stays on your phone. No accounts. No cloud. No ads. No tracking.

- Log periods with a single tap
- Track flow, symptoms, mood, and notes
- Predictions and cycle phase guidance
- Insights and doctor-ready PDF report
- Wren Pro: App Lock, Encrypted Backup, custom tags, themes

Your body. Your data. Your Wren.

Thank you for being an early user. ♥