# Cylla: Private Period Tracker — Fertility & Cycle Health Diary

> Private period and fertility tracker with on-device data storage. (iPhone/iPad app by SkyForce Systems LLC.)

- Source: https://appshunter.io/ios/app/cylla-private-period-tracker/id6761643806 (this page in markdown: same URL + `.md`)
- Developer: [SkyForce Systems LLC](https://appshunter.io/developer/319889533)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 12+
- Requires: iOS 17.0 · 6 MB
- Languages: American English, Arabic, French (France), German (Germany), Hindi, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish and 2 more
- Released: 2026-04-24
- Data updated: 2026-07-23
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/cylla-private-period-tracker/id6761643806/reviews.md

## What is Cylla?

Your body. Your data. Your phone. Period.

Cylla is the period tracker that collects nothing. No account. No cloud. No tracking you while you track your cycle. Every bit of data stays on your device — always.

PRIVATE BY DESIGN
Most period trackers upload your intimate health data to their servers. Cylla doesn’t have servers. There’s no account to create and no data to breach. Your cycle data lives on your phone and nowhere else. Lock it with Face ID or Touch ID.

TRACK YOUR CYCLE
- Log your period with one tap
- Track flow intensity, symptoms, and mood daily
- See your current cycle phase (menstrual, follicular, ovulation, luteal)
- Get cycle predictions based on your personal history
- View your cycle day, phase, and stats on a beautiful dashboard
- Monthly calendar view with cycle phases and logged data at a glance
- Set your period start date flexibly — today, yesterday, or any recent date

FERTILITY & OVULATION
- Daily fertility level on your dashboard (low, medium, high, peak)
- Fertile window timeline shows your most fertile days at a glance
- Track cervical mucus, basal body temperature (BBT), and LH tests
- Estimated ovulation day based on your personal cycle length
- Smart disclaimer when hormonal contraception suppresses ovulation

JOURNAL YOUR HEALTH
- Daily health diary with mood, symptoms, and notes in one view
- Timeline shows your complete health picture day by day
- Delete any day’s data anytime — it’s your data

LEARN FROM EXPERTS
- 88 curated, evidence-based health articles
- Sourced from ACOG, Mayo Clinic, WHO guidelines
- Topics: cycle health, symptoms, nutrition, mental wellness, reproductive health
- 36 articles free, 52 with Cylla Pro
- Available in 12 languages

INSIGHTS THAT MATTER
- See your symptom patterns across cycles
- Track mood trends over time
- Monthly health summaries with real data
- Fertility insights with recent observation history
- Cycle variation and regularity analysis

DATA PRIVACY CONTROLS
Your data, your rules:
- Reset all health data with one tap
- Option to start fresh with sample entries
- Protected by Face ID or Touch ID
- Complete control over what stays on your device

12 LANGUAGES
English, Spanish, French, German, Japanese, Chinese (Simplified & Traditional), Portuguese (Brazilian), Korean, Hindi, Arabic, and Vietnamese.

CYLLA PRO
Free: Full cycle tracking, fertility & ovulation tracking, symptom & mood logging, daily journal, calendar view, 36 health articles, Face ID lock, data privacy controls, all 12 languages.

Pro ($3.99/month or $9.99 lifetime): All 88 health articles, mood trends, monthly health summary, symptom pattern analysis, cycle alerts.

No ads. No data selling. No "anonymous" analytics. Nothing.

Subscription details:
• Monthly Plan: $3.99/month
• Lifetime: $9.99 (one-time purchase)
• Payment is charged to your Apple ID account at confirmation of purchase
• Monthly subscription auto-renews unless cancelled at least 24 hours before the end of the current period
• Manage subscriptions in Settings > Apple ID > Subscriptions
Privacy Policy: https://www.calmaxsystems.com/cylla/
Terms of Use: https://www.calmaxsystems.com/cylla/

We collect nothing. Zero. Your health data is yours alone.

This app provides general health information and is not a substitute for professional medical advice. Always consult your healthcare provider for medical decisions.

## Key features

- On-device data storage
- Cycle and fertility tracking
- Symptom and mood logging
- Health journal
- Evidence-based health articles
- Face ID/Touch ID protection
- Multiple language support

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro Lifetime | $9.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/cylla-private-period-tracker/id6761643806/reviews.md

### 5/5 — Kept my period info organized

*2026-04-25*

Easy to use and the dates and timeline is really clear.

## Frequently asked questions about Cylla

### What makes Cylla private?

Cylla is designed for privacy by keeping all your health data on your device. It does not require an account, use cloud storage, or track you. Your data remains on your phone and is protected by Face ID or Touch ID.

### Does Cylla have ads?

No, Cylla is completely ad-free. The developer explicitly states 'No ads. No data selling. No "anonymous" analytics. Nothing.'

### What health information can I track with Cylla?

You can log your period, flow intensity, symptoms, and mood daily. It also tracks fertility levels, fertile windows, cervical mucus, basal body temperature (BBT), and LH tests.

### How much does Cylla Pro cost?

Cylla Pro offers a monthly plan for $3.99 or a lifetime purchase for $9.99. The Pro version unlocks all 88 health articles and advanced insights like mood trends and symptom pattern analysis.

### What devices does Cylla support?

Cylla is available for iPhone and iPad. It is designed for iOS devices.

### How often is Cylla updated?

The latest version, 1.1, was released on April 30, 2026, indicating regular updates. The app was initially released on April 24, 2026.

### Can I cancel my Cylla Pro subscription?

Yes, your monthly Cylla Pro subscription auto-renews unless cancelled at least 24 hours before the end of the current period. You can manage your subscription through your Apple ID account settings.

### What age rating does Cylla have?

Cylla has an age rating of 12+. This suggests it is suitable for users aged 12 and older.

## Version history (last 3 releases)

### 1.6.0 — 2026-07-20

NEW IN 1.6

• Home Screen & Lock Screen widgets — your cycle day and phase at a glance
• Smarter reminders: fertile window, ovulation day, and gentle cycle check-ins
• Cycle recap — see a summary of your cycle when a new one begins
• Today's Read — a daily health article matched to your cycle phase
• Log your flow on any day of your period, not just the first
• Better predictions — see when your period is running late, and the calendar now shows every upcoming cycle
• Cycle history and averages in Insights
• Export your data anytime from Settings
• Bug fixes for cycle tracking and notification reliability

### 1.1 — 2026-04-30

New in Cylla v1.1:

- Calendar view — see your full cycle history month by month
- Next period card — always know when your period is expected
- Flexible cycle setup — set your actual period start date during onboarding
- Quick-edit cycle start — tap your cycle day on Home to adjust
- Editable cycle length — change your average cycle length anytime in Settings
- Tappable dashboard — tap Mood, Symptoms, or Flow to jump to tracking
- Smart new cycle flow — "Today", "Yesterday", or pick a date when starting a new period

Your body. Your data. Your phone. Period.

### 1.0 — 2026-04-24

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-23.*