FFMI vs ohMyTss
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FFMI
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Calculate and keep track of your Fat Free Mass Index (FFMI). Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ohMyTss
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Track your training readiness with onMyTss - the Body Battery app for endurance athletes. onMyTss analyzes your workout data from Apple Health to calculate your daily Training Stress Score (TSS) and Body Battery readiness level (0-100). Get personalized training guidance based on your fitness state. FEATURES: • Daily Body Battery score (0-100) showing training readiness • Training Stress Score (TSS) calculation from power and heart rate • Chronic Training Load (CTL) and Acute Training Load (ATL) tracking • Training Stress Balance (TSB) monitoring • 7-day trend visualization • Personalized training recommendations • FTP-based power analysis for cycling • Automatic HealthKit integration PRIVACY & DATA: • All data stored locally on your device • No cloud servers or data sharing • No advertising or data mining • Read-only HealthKit access Perfect for cyclists, runners, and endurance athletes who want data-driven training insights. Requires iOS 18.6 or later and Apple Health data.
Screenshots
Verdict
The clearest difference is in-app purchases: ohMyTss at none against FFMI's 1. ohMyTss also leads on update cadence (weekly vs every 3 months). FFMI's advantage is iOS requirement (16.0 vs 18.6). On price, 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. FFMI sells 1 in-app purchase, starting at $0.99 per year. ohMyTss asks for nothing beyond the download.
FFMI ships an update every 3 months, ohMyTss weekly. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.
| Parameter | FFMI | ohMyTss |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 6 MB | 2 MB |
| Age rating | 4+ | 12+ |
| Developer | Almudena Blanco Morett | Mingjun Liu |
In-app purchases
FFMI
- Full Year Access$0.991 Year
ohMyTss
No in-app purchases
