myRhythmWatch vs REPACE
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
myRhythmWatch
This app helps you understand and track your body's natural 24-hour cycles. By wearing an Apple Watch continuously, you can monitor your circadian rhythms, which are crucial for overall health and well-being. Identifying and improving these rhythms can lead to better sleep and health outcomes.
- Circadian rhythm monitoring
- Apple Watch integration
- HealthKit synchronization
- Rhythm stability assessment
- Health outcome improvement insights
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Our physical, emotional, and brain functions have 24-hour rhythms, also called circadian rhythms. These rhythms keep us in sync with the external world. Circadian rhythm disruption can contribute to sleep problems, diabetes, cognitive impairment, depression, dementia, and other health problems. MyRhythmWatch allows users to assess and track their circadian rhythms. Doing so - understanding your rhythms - is the first step towards improving them and optimizing your health. For MyRhythmWatch to work, wear an Apple Watch continuously for at least three days and nights. Don’t remove it when you sleep. Only brief periods of watch removal are OK, for example, we recommend taking your watch off and charging it while you bathe; or when for brief periods when you're settling down and won't be active anyway. Internet and Bluetooth connections are required to sync your data. After getting good data for a minimum of three days, you’ll be able to see your MyRhythmWatch scores. Weaker (smaller) rhythms and unstable (irregular) rhythms have been associated with health problems, and modifying weak/aberrant rhythms may improve wellbeing and health outcomes. Keep an eye on your rhythms with MyRhythmWatch. This app integrates with HealthKit functionality in the user interface. **Although this application is currently free to download, your registration must be confirmed before use. If you are interested in using MyRhythmWatch, please email Dr. Stephen Smagula (Stephen.Smagula@pitt.edu) describing your interest, including whether it is for personal use, research, or implementation in a clinical practice.**
REPACE
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REPACE can be your “Personal Workout Coach” Stop working out by running your longest and fastest miles. REPACE, your Personal Workout Coach, will guide you with a personalized workout program that takes into account your endurance and health levels by measuring your biometric data. You will experience a dramatic change in your physical performance with REPACE on your side. We integrate with the health app (HealthKit) to read and track your heart rate data and show them in a beautiful way (Heart rate functions in the app can be imported in conjunction with Apple Watch.)
Screenshots
Verdict
The clearest difference is iOS requirement: REPACE at 13.0 against myRhythmWatch's 15.5. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
myRhythmWatch ships an update fortnightly, REPACE every 3 weeks. The most recent releases landed on October 24, 2026 and October 13, 2026 respectively.
| Parameter | myRhythmWatch | REPACE |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Number of ratings | 4 — better | — |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPod, Apple Watch |
| Requires iOS | 15.5 | 13.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 92 MB |
| Age rating | 4+ | 4+ |
| Developer | University of Pittsburgh | OBELAB |
In-app purchases
myRhythmWatch
No in-app purchases
REPACE
No in-app purchases









