Auer Twight vs Red Diary
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Auer Twight
This app helps you stay focused on your primary goal by displaying it prominently on your device's home or lock screen. It uses a widget to keep your objective visible at all times.
- Goal widget for home and lock screens
- Keeps your primary objective visible
- Inspired by climber Mark Twight's philosophy
- Simple and focused design
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Auer Twight is a simple application that takes the one thing you said you wanted to achieve, your goal, and displays it up front and center in a widget. You can then add the widget to your Home Screen, your Lock Screen, etc. The app is named after the legendary climber Mark Twight and his Recipe.
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.
- 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
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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
Screenshots
Verdict
The clearest difference is in-app purchases: Auer Twight at none against Red Diary's 2. Red Diary's advantage is update cadence (every 3 days vs every 17 months) and ratings volume (9 vs 1). On price, rating, ads 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
Both are free to download. Red Diary sells 2 in-app purchases, starting at $0.99 per month. Auer Twight asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Auer Twight against 5.0 for Red Diary. That said, the two scores are not equally well evidenced: Red Diary has 9 ratings behind it against 1, so its average is the more settled of the two.
Auer Twight ships an update every 17 months, Red Diary every 3 days. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.
| Parameter | Auer Twight | Red Diary |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (9 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 9 — better |
| Update frequency | Every 17 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone | iPhone, Apple Watch — better |
| Requires iOS | 26.0 | 17.6 — better |
| Further details — not scored | ||
| Size | 0 MB | 8 MB |
| Age rating | 4+ | 12+ |
| Developer | Uri Fridman | RUBINS DORMEUS |
Customer experience
Auer Twight
Red Diary
In-app purchases
Auer Twight
No in-app purchases
Red Diary
- Premium Monthly7 Days trial$0.991 Month
- Premium Annual$4.991 Year









