Comparison

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.

Head to head
About

Ondi

Features
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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 โ€ข Period tracking with automatic cycle detection โ€ข Daily logging: flow, mood, energy, sleep, symptoms โ€ข Cycle predictions that improve over time โ€ข Calendar with cycle history โ€ข Cycle irregularity alerts UNLOCK EVERYTHING (one-time purchase) โ€ข Fertility tracking: temperature, cervical mucus, ovulation tests โ€ข Contraception side effect matching โ€ข Headache and migraine pattern detection โ€ข PMS prediction and sleep analysis โ€ข Exercise guidance tailored to your cycle phase โ€ข Trying to Conceive mode with timing insights โ€ข Pregnancy mode: week-by-week guidance and due date โ€ข Postpartum recovery tracking โ€ข 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.

About

PHASES. Cycle Tracker & Diary

Read full description

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

Ondi4 screens
PHASES. Cycle Tracker & Diary4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Ondi sells 1 one-off in-app purchase. PHASES. Cycle Tracker & Diary asks for nothing beyond the download.

UpkeepUpdate frequency

Ondi ships an update weekly, PHASES. Cycle Tracker & Diary every 2 months. Both last shipped on November 5, 2026.

Scorecard3 real differences ยท 3 level
Ondi versus PHASES. Cycle Tracker & Diary: the parameters behind the verdict, then further details
ParameterOndiPHASES. Cycle Tracker & Diary
PriceFreeFree
Update frequencyWeekly โ€” betterEvery 2 months
AdsNoNo
In-app purchasesYesNo โ€” better
DevicesiPhone, iPad โ€” betteriPhone
Requires iOS17.0 โ€” better26.2
Further details โ€” not scored
Size10 MB2 MB
Age rating12+4+
DeveloperBlue Flame GamesmyNFP GmbH

In-app purchases

1 purchases

Ondi

One-time1
  • Cyla Premium$7.99
None

PHASES. Cycle Tracker & Diary

No in-app purchases

Questions

Is Ondi free?
Ondi is free to download, with in-app purchases available.
Is PHASES. Cycle Tracker & Diary free?
PHASES. Cycle Tracker & Diary is free to download, with no in-app purchases.
Do Ondi or PHASES. Cycle Tracker & Diary have ads?
Neither Ondi nor PHASES. Cycle Tracker & Diary shows ads.
Which is updated more often, Ondi or PHASES. Cycle Tracker & Diary?
Ondi ships an update weekly, and PHASES. Cycle Tracker & Diary every 2 months. Most recently, Ondi was updated on November 5, 2026 and PHASES. Cycle Tracker & Diary on November 5, 2026.

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