# rectify vs EOK Challenge

The clearest difference is in-app purchases: EOK Challenge at none against rectify's 1. EOK Challenge also leads on ads (none vs shown). rectify's advantage is device support (4 vs 2). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. rectify sells 1 in-app purchase, starting at $7.99 per month. EOK Challenge asks for nothing beyond the download.

rectify ships an update every 3 days, EOK Challenge weekly. The most recent releases landed on November 3, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | rectify | EOK Challenge |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Weekly |
| Size | 160 MB | 2 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 12+ | 4+ |
| Developer | [MinkTec GmbH](https://appshunter.io/developer/1634767386) | [EOK Essen ohne Kohlenhydrate GmbH](https://appshunter.io/developer/1685194169) |

## What reviewers say

### rectify

[App page](https://appshunter.io/ios/app/rectify-posture-tracking/id1634767384)

**Features:** Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AirPods Head Tracking | $7.99 | per month |


### EOK Challenge

[App page](https://appshunter.io/ios/app/eok-challenge/id6816933269)

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

**In-app purchases:** none


## Frequently asked questions

### Is rectify free?

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

### Is EOK Challenge free?

EOK Challenge is free to download, with no in-app purchases.

### Do rectify or EOK Challenge have ads?

rectify shows ads; EOK Challenge does not.

### Which is updated more often, rectify or EOK Challenge?

rectify ships an update every 3 days, and EOK Challenge weekly. Most recently, rectify was updated on November 3, 2026 and EOK Challenge on November 10, 2026.

---

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