# rectify vs Formetric

The clearest difference is in-app purchases: Formetric at none against rectify's 1. Formetric also leads on ads (none vs shown). rectify's advantage is device support (4 vs 1) and iOS requirement (15.6 vs 17.0). On price and update cadence there is nothing between them.

Both are free to download. rectify sells 1 in-app purchase, starting at $4.99 per month. Formetric asks for nothing beyond the download.

rectify ships an update every 3 days, Formetric every 2 days. The most recent releases landed on October 1, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | rectify | Formetric |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 3 days | **Every 2 days** |
| Size | 189 MB | 68 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [MinkTec GmbH](https://appshunter.io/developer/1634767386) | [Mustafa Kazi](https://appshunter.io/developer/1863520547) |

## 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 | $4.99 | per month |


### Formetric

[App page](https://appshunter.io/ios/app/formetric/id6756895783)

**In-app purchases:** none


## Frequently asked questions

### Is rectify free?

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

### Is Formetric free?

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

### Do rectify or Formetric have ads?

rectify shows ads; Formetric does not.

### Which is updated more often, rectify or Formetric?

rectify ships an update every 3 days, and Formetric every 2 days. Most recently, rectify was updated on October 1, 2026 and Formetric 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.*