Clear Period Tracker vs Calla
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Clear Period Tracker
Easily monitor your menstrual cycle, fertility, and daily health with accurate predictions and a simple interface. Features include a fertility calculator, secure app lock, and a personal diary for notes. Optimized for smooth performance on any device.
- Menstrual cycle tracking
- Fertility calculator
- Secure app lock with PIN
- Personal diary
- Widget support
- Customizable themes
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Discover the easiest way to track your menstrual cycle. Our app combines a simple design with powerful features to help you monitor your period, fertility, and daily health. CORE FEATURES: Cycle Tracking: Accurate predictions for your next period. Fertility Calculator: Identify your ovulation days and fertile window easily. Secure App Lock: Set a 4-digit PIN code to keep your data private from prying eyes. Data Control: Includes a "Clear All Data" panic button for total privacy management. Intimacy Tracker: Log sexual activity and protectiveness methods. Personal Diary: Add notes for every day of the calendar. Widget Support: Check your cycle days directly from your home screen. Custom Themes: Switch between different color schemes to suit your mood. Designed to be Lightweight: We hate bloated apps too. This calendar is optimized to run smoothly on any device without draining your battery or taking up unnecessary storage. Simple Interface: No confusing medical jargon or cluttered screens. Just the tools you need to understand your body better. Get the app today and take control of your cycle!
Calla
This app helps teens understand their menstrual cycles with privacy-focused tracking. It learns individual patterns for accurate predictions and allows logging of various symptoms to connect with cycle phases. Optional parent sharing provides a simple wellness update without revealing sensitive data.
- Personalized cycle predictions
- Symptom and mood logging
- Age-appropriate cycle insights
- Prep-day period reminders
- Optional parent wellness sharing
- Privacy-first data storage
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Most period apps were built for adults trying to get pregnant. Calla wasn't. It's built for teens who just want to understand what's happening in their body - without the noise, the upsells, or the ovulation countdowns. Your data lives on your phone. No accounts required. No ads. No third parties, no data brokers, no advertisers. Optional parent share, if you want it. Privacy-first. Always. All your data stays on your phone. No accounts. No cloud. No ads. No data selling. Period. Built for how your body actually works Irregular cycles? That's normal, especially when you're starting out. Calla doesn't just assume a 28-day cycle - it learns your patterns and gives you predictions that actually make sense for your body. Track what matters to you Log your period, flow level, mood, energy, cramps, sleep, skin, focus, appetite, and activity. See how your cycle connects to how you feel day to day. Understand your cycle Get gentle, age-appropriate insights about each phase of your cycle - what's happening in your body and what to expect. Prep-day reminders Get a heads-up before your period is predicted to start so you're never caught off guard. Parent Mode Share a simple wellness signal with a parent or guardian - "all good" or "heads up" - without revealing any cycle details. Communication on your terms. Calla is not a medical app. It does not diagnose, treat, or prevent any medical condition. If you have health concerns, talk to a doctor.
Screenshots
Verdict
The clearest difference is rating: Clear Period Tracker at 5.0 against Calla's 4.4. Calla's advantage is ratings volume (5 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Clear Period Tracker holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Calla has 5 ratings behind it against 1, so its average is the more settled of the two.
| Parameter | Clear Period Tracker | Calla |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | 4.4 (5 ratings) |
| Number of ratings | 1 | 5 — better |
| Update frequency | Every 3 weeks | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 51 MB | 33 MB |
| Age rating | 9+ | 12+ |
| Developer | Viktor Nikolenko | Roxana Heitz |
In-app purchases
Clear Period Tracker
No in-app purchases
Calla
No in-app purchases








