FFMI Analyzer vs Slope
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FFMI Analyzer
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[All features are free. Tips (about the price of an iced coffee) are optional.] A body composition app that visualizes your true muscle mass (FFMI)—something weight and BMI alone cannot show. No tedious manual entry required. Syncs with the Health app and provides graphs built for analysis. [Sync with the Mac app] The long-awaited Mac version is here. Share iPhone data to the Mac app via iCloud and view and analyze it on a larger screen. Ideal for reviewing long-term trends and subtle changes at your desk or on your home PC. (Sync is one tap from the analysis screen—a reliable manual sync you control when you need it.) [Key features] Graph image export: Export all your data as a single scroll-free image for review and sharing. Multi-device support: iPhone and iPad, plus Mac viewing via iCloud sync. Detailed nutrition analysis: Overlay PFC balance and vitamin/mineral intake on your graphs. Energy expenditure analysis: See basal and active energy to check intake vs. burn at a glance. Integration with Workout Analyzer: Launch Workout Analyzer with a single tap via URL scheme. Seamlessly switch back and forth to evaluate your muscle mass (FFMI) and daily training load. Automatic sync: Weight, body fat, steps, nutrition, and burned calories from Health. [Our policy] Completely free / No ads Privacy first (data is processed on-device by default; only necessary data is sent to iCloud for Mac sync) Calculation logic based on academic research
Slope
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Daily weight jumps are noisy. Slope helps you lose fat by focusing on your real weight trend, adaptive calorie target, protein intake, and training consistency without accounts, ads, analytics, or subscriptions. Slope is for beginners cutting weight who want a simple private system: weigh in, log food, hit protein, train, and let the app adjust as real progress shows up. - See your smoothed weight trend instead of reacting to random scale spikes. - Get a calorie target that adapts from your own weight and food data. - Track protein while eating in a deficit. - Log workouts, sets, reps, rest times, and progression. - Sync privately with iCloud. - Works with Apple Health. - No account, no ads, no analytics, no tracking. - One-time purchase after trial - no subscription.
Screenshots
Verdict
The clearest difference is in-app purchases: Slope at none against FFMI Analyzer's 3. FFMI Analyzer's advantage is update cadence (every 2 days vs weekly). On price, ads, device support and iOS requirement 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 Analyzer sells 3 one-off in-app purchases. Slope asks for nothing beyond the download.
FFMI Analyzer ships an update every 2 days, Slope weekly. The most recent releases landed on October 7, 2026 and October 5, 2026 respectively.
| Parameter | FFMI Analyzer | Slope |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days — better | Weekly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Requires iOS | 26.2 | 26.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Tomoharu Iseki | Tahseen Ahamad |
In-app purchases
FFMI Analyzer
- Coffee (Small)$1.99
- Coffee (Medium)$2.99
- Coffee (Large)$4.99
Slope
No in-app purchases








