# RK fit vs Solley

The clearest difference is price: RK fit at Free against Solley's $1.99. RK fit also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.2). Solley's advantage is in-app purchases (none vs 4). On update cadence and ads there is nothing between them.

RK fit is free to download; Solley costs $1.99 up front. RK fit sells 4 one-off in-app purchases. Solley asks for nothing beyond the download.

RK fit ships an update every 7 months, Solley every 6 months. The most recent releases landed on October 30, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | RK fit | Solley |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 months** |
| Monetization | Free with in-app purchases | — |
| Size | 76 MB | 4 MB |
| Requires iOS | **15.1** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Romane Pertolas](https://appshunter.io/developer/1781201870) | [Arnaud GUITARD](https://appshunter.io/developer/665642145) |

## What reviewers say

### RK fit

[App page](https://appshunter.io/ios/app/rk-fit/id6738574406)

This fitness app offers biomechanically-based training programs tailored to your goals, with exercise libraries, eBooks, and scientific articles. Track progress, discover exercise variations, and access nutrition guidance with recipes and a calorie calculator to support muscle gain, fat loss, or overall fitness.

**Highlights:** Biomechanically-based training programs, Exercise library with variations, Progress tracking for strength gains, Nutrition guidance with recipes, Calorie and portion calculator, Scientific articles and eBooks

**Features:** macOS Compatibility, Apple Wallet, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pack d'un programme | $39.00 | one-time |
| Pack de deux programmes | $69.00 | one-time |
| Pack de trois programmes | $99.99 | one-time |
| Pack de quatre programmes | $129.99 | one-time |


### Solley

[App page](https://appshunter.io/ios/app/solley/id6740872161)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RK fit free?

RK fit is free to download, with in-app purchases available.

### Is Solley free?

Solley costs $1.99, with no in-app purchases.

### Do RK fit or Solley have ads?

Neither RK fit nor Solley shows ads.

### Which is updated more often, RK fit or Solley?

RK fit ships an update every 7 months, and Solley every 6 months. Most recently, RK fit was updated on October 30, 2026 and Solley on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*