Perla Period & Cycle Tracker

Perla is the period tracker built on one rule: your data never leaves your phone.

No account. No cloud. No ads. No third-party analytics. Everything runs on your device - including the AI.

Try free for 14 days. $2.99/month or $19.99/year.

PREDICT YOUR CYCLE WITH CONFIDENCE

Log your period, flow intensity, and 30+ symptoms in seconds. Perla's multi-layer prediction engine analyzes your patterns, BBT data, cervical mucus, and OPK results to predict your next 12 cycles - with confidence scores that show how certain each prediction is.

YOUR APPLE WATCH IS YOUR THERMOMETER

Own an Apple Watch Series 8 or newer? Perla automatically imports your overnight wrist temperature. No separate thermometer. No $150/year subscription. Just the watch you already wear.

DAILY FERTILITY SCORE YOU CAN ACTUALLY UNDERSTAND

A transparent 0-100 score that breaks down exactly why it's that number: cycle position, cervical mucus, temperature, OPK results, and confidence. No black box.

AI INSIGHTS, 100% ON-DEVICE

Perla's AI analyzes your cycle patterns, predicts symptoms before they hit, and explains what your charts actually mean - all running on your device. Zero network calls, zero data sent anywhere.

PRIVACY IS THE ARCHITECTURE, NOT A FEATURE

This is not a marketing claim. Perla has no server. No API. No database in the cloud. There is nothing to hack, subpoena, or leak.

- 100% on-device storage
- No account or sign-up required
- No cloud sync (iCloud backup is managed by Apple)
- No analytics or tracking SDKs - zero Firebase, zero Amplitude, zero MixPanel
- AI runs entirely on your device (on-device neural engine)
- Full data export (JSON, PDF) and one-tap deletion

EVERYTHING INCLUDED, ONE PRICE

No "upgrade to unlock" gates. No premium tiers. Every feature, every mode, full access:

- Period & flow tracking with auto-fill
- 30+ symptoms with severity + custom categories
- Cervical mucus, BBT, OPK, pregnancy tests, sexual activity
- 12-month predictions with confidence windows
- Symptom predictions with 7-day forecasts
- Daily fertility score with factor breakdown
- Apple Watch wrist temperature auto-import
- BBT chart with thermal shift detection
- On-device AI insights + chart explanations
- Cycle history, symptom heatmap, cycle comparison
- Pregnancy mode (40-week tracking)
- Birth control tracking + pill reminders
- Health conditions (PCOS, endometriosis, thyroid, more)
- Apple Health sync (read + write)
- PDF doctor report export
- iCloud backup & restore
- Phase-aware daily wellness tips

WHY PERLA EXISTS

87% of period trackers share your data with third parties. One was fined $56 million for it. Your cycle is one of the most intimate things about you - it shouldn't be a data product.

Perla is built by one independent developer. There is no board, no investors, no incentive to monetize your body. The app has no server because it was never supposed to have one. Your data stays on your phone not because of a toggle in settings, but because there is nowhere else for it to go.

The name means "pearl" - something beautiful, private, and yours.

14-DAY FREE TRIAL

Every feature. No credit card tricks. $2.99/month, $19.99/year, or pay once and own it forever for $49.99. No recurring charges, no expiration. Perla is yours for life.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/