# 21 Days Habit Transformation vs Commit

The clearest difference is update cadence: Commit at daily against 21 Days Habit Transformation's every 4 months. 21 Days Habit Transformation's advantage is iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 21 Days Habit Transformation sells 1 one-off in-app purchase and Commit sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

21 Days Habit Transformation ships an update every 4 months, Commit daily. The most recent releases landed on September 22, 2026 and December 26, 2025 respectively.

## The numbers

| Metric | 21 Days Habit Transformation | Commit |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Daily** |
| Size | 113 MB | 8 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [GREWON TECHNOLOGIES PRIVATE LIMITED](https://appshunter.io/developer/1589043091) | [Niels Hoogendoorn](https://appshunter.io/developer/1564735227) |

## What reviewers say

### 21 Days Habit Transformation

[App page](https://appshunter.io/ios/app/21-days-habit-transformation/id6467082746)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime access | $5.99 | one-time |


### Commit

[App page](https://appshunter.io/ios/app/commit/id6654536873)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Keep it simple and accountable | $1.99 | one-time |
| Step up your commitment | $7.99 | one-time |
| Biggest Commitment - Go all-in | $12.99 | one-time |


## Frequently asked questions

### Is 21 Days Habit Transformation free?

21 Days Habit Transformation is free to download, with in-app purchases available.

### Is Commit free?

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

### Do 21 Days Habit Transformation or Commit have ads?

Neither 21 Days Habit Transformation nor Commit shows ads.

### Which is updated more often, 21 Days Habit Transformation or Commit?

21 Days Habit Transformation ships an update every 4 months, and Commit daily. Most recently, 21 Days Habit Transformation was updated on September 22, 2026 and Commit on December 26, 2025.

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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.*