Comparison

PHASES. Cycle Tracker & Diary vs Rhythmus

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

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

About

Rhythmus

Features
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Rhythmus is a period tracker with a cycle calendar โ€” plus a nutrition and training plan that changes with your cycle. WHAT RHYTHMUS DOES โ€ข Cycle and period calendar: log your period, see your cycle day and phase at a glance, with estimated ovulation and fertile window โ€ข Nutrition plan: meals and nutrients matched to your current phase โ€“ omnivore, vegetarian, vegan โ€“ with a shopping list โ€ข Training plan: workouts scaled to your intensity and training days, logged set by set โ€ข Supplements: which nutrients matter in which phase โ€ข Daily energy check-in: feeling low, and the app suggests a gentler session โ€ข Weekly overview, symptom diary, cycle statistics from your own history WHO IT IS FOR For women who train and notice that the same session feels easy one week and impossible the next. Menstruation, follicular phase, ovulation and the luteal phase each ask for something different โ€” Rhythmus takes that into account. NO ACCOUNT, NO TRACKING No sign-up, no registration, no ads, no subscriptions, no in-app purchases. Everything you enter stays on your device and is sent nowhere. The app works fully offline. From Settings you can export a backup at any time and restore it on another device. WITH SOURCES Every health statement in the app comes with a citation you can tap โ€” straight to the study or fact sheet. Among others from the Journal of the International Society of Sports Nutrition, the Journal of Medical Internet Research and the National Institutes of Health. Available in German, English and Spanish. Rhythmus is a free passion project. Note: Rhythmus is not a medical device, not a contraception method, and does not replace medical advice.

Screenshots

PHASES. Cycle Tracker & Diary4 screens
Rhythmus4 screens

Verdict

The call

The clearest difference is update cadence: Rhythmus at daily against PHASES. Cycle Tracker & Diary's every 2 months. Rhythmus also leads on iOS requirement (15.0 vs 26.2). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PHASES. Cycle Tracker & Diary ships an update every 2 months, Rhythmus daily. The most recent releases landed on September 24, 2026 and September 14, 2026 respectively.

Scorecard2 real differences ยท 4 level
PHASES. Cycle Tracker & Diary versus Rhythmus: the parameters behind the verdict, then further details
ParameterPHASES. Cycle Tracker & DiaryRhythmus
PriceFreeFree
Update frequencyEvery 2 monthsDaily โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhoneiPhone, iPod โ€” better
Requires iOS26.215.0 โ€” better
Further details โ€” not scored
Size2 MB9 MB
Age rating4+4+
DevelopermyNFP GmbHPatrick Sarpen

In-app purchases

None

PHASES. Cycle Tracker & Diary

No in-app purchases

None

Rhythmus

No in-app purchases

Questions

Is PHASES. Cycle Tracker & Diary free?
PHASES. Cycle Tracker & Diary is free to download, with no in-app purchases.
Is Rhythmus free?
Rhythmus is free to download, with no in-app purchases.
Do PHASES. Cycle Tracker & Diary or Rhythmus have ads?
Neither PHASES. Cycle Tracker & Diary nor Rhythmus shows ads.
Which is updated more often, PHASES. Cycle Tracker & Diary or Rhythmus?
PHASES. Cycle Tracker & Diary ships an update every 2 months, and Rhythmus daily. Most recently, PHASES. Cycle Tracker & Diary was updated on September 24, 2026 and Rhythmus on September 14, 2026.

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