Ondi vs PHASES. Cycle Tracker & Diary
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Ondi
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Private period tracking, with daily logs and cycle history on your device. No account required. Ondi learns your unique cycle and gives you personalised insights that get smarter with every log. WHAT'S FREE โ ALWAYS โข Period tracking with automatic cycle detection โข Daily logging: flow, mood, energy, sleep, symptoms โข Cycle predictions that improve over time โข Calendar with cycle history โข Cycle irregularity alerts UNLOCK EVERYTHING (one-time purchase) โข Fertility tracking: temperature, cervical mucus, ovulation tests โข Contraception side effect matching โข Headache and migraine pattern detection โข PMS prediction and sleep analysis โข Exercise guidance tailored to your cycle phase โข Trying to Conceive mode with timing insights โข Pregnancy mode: week-by-week guidance and due date โข Postpartum recovery tracking โข Data export for doctor appointments PRIVACY FIRST Your logs are stored on your device. Ondi does not operate a server for your health records or use tracking analytics. Apple Health access is optional, and you choose when to export or share a report. Copies you export and data stored in Apple Health are managed separately. EVERY STAGE OF YOUR JOURNEY From first periods to menopause, Ondi adapts. Perimenopause pattern detection, postpartum period return guidance, and breastfeeding-aware insights โ all explained in plain language. WORKS WITH APPLE WATCH Reads wrist temperature and heart rate data from Apple Health to enhance predictions without manual tracking. Ondi is not a medical device and should not be used as contraception. Predictions are estimates. Always consult a healthcare provider for medical decisions.
PHASES. Cycle Tracker & Diary
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A completely new perspective on your cycle and your everyday life. MORE THAN SYMPTOMS. Most cycle apps only let you track symptoms. PHASES goes further. Focus on what matters most in your everyday life. Not just symptoms, but also what you did and experienced. Sports, nutrition, date nights, family moments, relationship highs and lows, work stress, social events โ everything that matters to you. Clearly presented in a unique vertical calendar. FOR MEN, TOO. Why are cycle apps always made just for women? Enter your partner's period and alongside it your own life. Because HER cycle has an impact on YOUR relationship life when it comes to moods and libido. So you know what's going on โ for a better mutual understanding. DISCOVER PATTERNS you haven't seen before. When you keep everything in one place, connections become visible. How does your energy change around your ovulation, or your partner's? How do sleep, nutrition, and exercise relate to how you feel? PHASES makes these patterns visible so you can understand yourself better and plan smarter. PRIVACY BY DESIGN. Cycle apps that store data on servers are a no-go. PHASES stores everything exclusively on your device. No account required. No server. No tracking. No third parties. Your entries never leave your smartphone. FEATURES. - Unique vertical calendar - Fully customizable categories and entries - Track your period and receive a forecast - Bleeding isn't the same as your period. You can log both separately - Track ovulation, for example when you've confirmed it with an ovulation test or NFP - Log everything that matters to you: symptoms, mood, energy, sleep, sports, nutrition, social life, relationships and more - 100% on device. No cloud, no tracking - Core features usable without a subscription
Screenshots
Verdict
The clearest difference is in-app purchases: PHASES. Cycle Tracker & Diary at none against Ondi's 1. Ondi's advantage is update cadence (weekly vs every 2 months) and iOS requirement (17.0 vs 26.2). On price, ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Ondi sells 1 one-off in-app purchase. PHASES. Cycle Tracker & Diary asks for nothing beyond the download.
Ondi ships an update weekly, PHASES. Cycle Tracker & Diary every 2 months. Both last shipped on November 5, 2026.
| Parameter | Ondi | PHASES. Cycle Tracker & Diary |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly โ better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad โ better | iPhone |
| Requires iOS | 17.0 โ better | 26.2 |
| Further details โ not scored | ||
| Size | 10 MB | 2 MB |
| Age rating | 12+ | 4+ |
| Developer | Blue Flame Games | myNFP GmbH |
In-app purchases
Ondi
- Cyla Premium$7.99
PHASES. Cycle Tracker & Diary
No in-app purchases
Questions
Is Ondi free?
Is PHASES. Cycle Tracker & Diary free?
Do Ondi or PHASES. Cycle Tracker & Diary have ads?
Which is updated more often, Ondi or PHASES. Cycle Tracker & Diary?
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