244+ iOS apps curated and reviewed
The best 21 day body transformation apps on iPhone average 3.9★ across 244+ titles — we've ranked them by what real users actually keep on their phones. Updated October 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 2.6★ (5) | Yes | Yes | Oct 2026 | |
| 2 |  | Free | 5.0★ (3) | No | Yes | Oct 2026 | |
| 3 |  | Free | 4.8★ (692) | Yes | Yes | Oct 2026 | |
| 4 |  | Free | 5.0★ (1) | No | Yes | Sep 2026 | |
| 5 |  | Free | — | Yes | Yes | Aug 2026 | |
| 6 |  | Free | — | Yes | No | Oct 2026 | |
| 7 |  | Free | 3.7★ (12) | No | Yes | Oct 2026 | |
| 8 |  | Free | 5.0★ (13) | No | No | Oct 2026 |
This program offers a 3-week fitness plan with daily bodyweight workouts to help users lose fat and build strength. It's designed for home use and requires minimal daily exercises.
Effortlessly add realistic muscle definition to your photos using AI. Choose from multiple modes for men and women, with or without clothing, to achieve your desired physique. Easily save and share your transformed images.
This app helps you build lasting habits by tracking your progress on custom challenges. Set flexible durations, log daily progress with photos and notes, and monitor weight trends. Stay motivated with home screen widgets to maintain your streaks.
