Comparison

Red Diary vs Mondra

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

Head to head
About

Red Diary

This app analyzes your symptoms, mood, energy, sleep, and activity to provide personalized insights and daily guidance tailored to your cycle phases. It offers a body weather forecast and smart recommendations for exercise, nutrition, and self-care.

Highlights
  • Personalized cycle insights
  • Smart daily guidance
  • Body weather forecast
  • Cycle tracking modes (fertility, pregnancy, birth control)
  • Symptom and mood logging
  • HealthKit integration
  • Apple Watch companion app
Features
Read full description

A period and cycle tracker that keeps your data on your phone. No account. No cloud. No tracking. No ads. Most period apps send your most private information to their servers. Red Diary doesn't have servers. Free to track your cycle, log symptoms, and get predictions — no trial, no card, no expiry. Premium unlocks the fertility, pregnancy, and insight modes. PRIVATE BY DESIGN Your cycle history, symptoms, and intimate details never leave your device. There is no account to create, no server to breach, and no company reading your data. Export anytime for a doctor's visit or your own backup — it's your information. BUILT FOR REAL CYCLES, NOT AVERAGE ONES Most trackers assume a textbook 28 days and get confused when yours doesn't cooperate. Red Diary reads each cycle on its own terms, so irregular, long, short, and changing cycles are understood instead of flagged as wrong. BODY WEATHER Your own forecast, built from your own logs. Red Diary looks for patterns across your history and tells you what today has tended to look like for you — sunny, clear, mixed, overcast, or stormy. If it doesn't have enough history to say something true, it tells you that instead of guessing. WHAT SHOULD I DO TODAY? Every time you open the app, you get an answer. Phase-aware guidance for movement, food, and rest that shifts as your body does. FOUR MODES Track My Cycle — phase-by-phase analytics and predictions Trying to Conceive — fertile window, peak day, cycle health, and support through the two-week wait Avoid Pregnancy — honest fertility status, including the days it can't be certain about I'm Pregnant — 40 weeks of content, kick counter, appointments, and trimester insights Switch whenever life changes. The app changes with you. A CALENDAR THAT ACTUALLY WORKS Start and end your period with one tap, right from the calendar. Backdate cycles you missed. Log intercourse. See period, predicted, fertile, and logged days at a glance — with moon phases, if you like tracking alongside them. WHY YOU FEEL LIKE THIS Log symptoms, mood, sleep, temperature, and more. Red Diary finds what repeats across your cycles and explains what's behind it, instead of just recording it. SHARE HOW YOU FEEL Send a phase-aware note to a partner, a friend, or your birth control buddy through iMessage, WhatsApp, or anywhere else. No accounts, on either end. ON YOUR WRIST Cycle day, phase, and progress ring on your watch face in phase-matched colors. Start or end your period, log your mood, and get guidance without reaching for your phone. APPLE HEALTH Steps, calories, exercise, and sleep flow in automatically. See how your energy and activity really shift across your cycle — no extra logging. BIRTH CONTROL REMINDERS Pill, patch, ring, shot, IUD, or implant. On-time reminders, streak tracking, and insights that adapt to your method. WHAT'S PREMIUM Trying to Conceive, Avoid Pregnancy, and Pregnancy modes, Body Weather, full cycle insights, fertility analytics, and mood sharing. Cycle tracking, logging, predictions, calendar, and birth control reminders are free and stay free. Privacy Policy: https://dormeusapps.com/reddiary-privacy.html Terms of Use: https://dormeusapps.com/reddiary-terms.html

About

Mondra

Features
Read full description

Mondra is your private cycle and period tracker – with predictions and privacy first. Your data stays on your iPhone. No account, no ads, no data selling. PREDICTIONS THAT LEARN Mondra predicts your next period, your fertile days and your ovulation – and gets more accurate with every cycle. If you like, Mondra learns your personal cycle length from the ovulations you feel. EVERYTHING FOR YOUR CYCLE • Log your period with intensity • Ovulation (side & mid-cycle pain) • 12 symptoms, moods & free notes • Full-text search and filter by symptom • A clear monthly calendar • Statistics on cycle length, duration & variation REMINDERS & CALENDAR Gentle reminders before your period and fertile days – local, with no server at all. If you like, Mondra adds everything to a dedicated calendar in your Apple Calendar app. YOUR PRIVACY – FOR REAL • No account, no sign-up • No ads, no tracking • No data selling • Optional, private iCloud sync via your own Apple account • Backup export as a file – your data belongs to you • Face ID lock FAIR & NO SUBSCRIPTION Download Mondra for free and try every feature for 30 days. Then unlock the app permanently with a one-time purchase – no subscription, no hidden costs. Mondra is not a substitute for medical advice. Predictions are estimates and especially inaccurate with irregular cycles.

Screenshots

Red Diary4 screens
Mondra4 screens

Verdict

The call

The clearest difference is update cadence: Red Diary at every 3 days against Mondra's weekly. On price, ads, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Red Diary sells 2 in-app purchases, starting at $0.99 per month and Mondra sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Red Diary ships an update every 3 days, Mondra weekly. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

Scorecard1 real difference · 9 level
Red Diary versus Mondra: the parameters behind the verdict, then further details
ParameterRed DiaryMondra
PriceFreeFree
Rating5.0 (9 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings9 — better—
Update frequencyEvery 3 days — betterWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, Apple Watch — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size8 MB3 MB
Age rating12+4+
DeveloperRUBINS DORMEUSKim Gerichhausen

In-app purchases

2 purchases

Red Diary

Subscriptions2
  • Premium Monthly7 Days trial$0.991 Month
  • Premium Annual$4.991 Year
1 purchases

Mondra

One-time1
  • Mondra Full Version$3.99

Questions

Is Red Diary free?
Red Diary is free to download, with in-app purchases available.
Is Mondra free?
Mondra is free to download, with in-app purchases available.
Do Red Diary or Mondra have ads?
Neither Red Diary nor Mondra shows ads.
Which is updated more often, Red Diary or Mondra?
Red Diary ships an update every 3 days, and Mondra weekly. Most recently, Red Diary was updated on October 16, 2026 and Mondra on October 25, 2026.

Other comparisons