# Retro Flex vs ONYX Coaching

The clearest difference is in-app purchases: Retro Flex at none against ONYX Coaching's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. ONYX Coaching sells 1 in-app purchase, starting at $100.00 per month. Retro Flex asks for nothing beyond the download.

Retro Flex ships an update every 6 weeks, ONYX Coaching every 2 months. The most recent releases landed on October 13, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Retro Flex | ONYX Coaching |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Size | 40 MB | 46 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Fit Cloud Technology Limited](https://appshunter.io/developer/1079311129) | [DANIEL JOHN MALPASS](https://appshunter.io/developer/1767879246) |

## What reviewers say

### Retro Flex

[App page](https://appshunter.io/ios/app/retro-flex/id6476487882)

**Features:** macOS Compatibility

**In-app purchases:** none


### ONYX Coaching

[App page](https://appshunter.io/ios/app/onyx-coaching/id6673919570)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Coaching | $100.00 | per month |


## Frequently asked questions

### Is Retro Flex free?

Retro Flex is free to download, with no in-app purchases.

### Is ONYX Coaching free?

ONYX Coaching is free to download, with in-app purchases available.

### Do Retro Flex or ONYX Coaching have ads?

Neither Retro Flex nor ONYX Coaching shows ads.

### Which is updated more often, Retro Flex or ONYX Coaching?

Retro Flex ships an update every 6 weeks, and ONYX Coaching every 2 months. Most recently, Retro Flex was updated on October 13, 2026 and ONYX Coaching on October 2, 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.*