# 21 Day Challenge vs Sober Tracker

The clearest difference is in-app purchases: 21 Day Challenge at none against Sober Tracker's 9. 21 Day Challenge also leads on device support (3 vs 1) and iOS requirement (9.0 vs 17.6). Sober Tracker's advantage is update cadence (every 4 days vs every 9 months). On price and ads there is nothing between them.

Both are free to download. Sober Tracker sells 9 in-app purchases, starting at $2.99 per month. 21 Day Challenge asks for nothing beyond the download.

21 Day Challenge ships an update every 9 months, Sober Tracker every 4 days. The most recent releases landed on September 16, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | 21 Day Challenge | Sober Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (31 ratings)](https://appshunter.io/ios/app/sober-tracker-quit-drinking/id6741011041/reviews)** |
| Number of ratings | — | **31** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 99 MB | 76 MB |
| Requires iOS | **9.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Phanupong Sanmee](https://appshunter.io/developer/1435296424) | [Ivan Terekhin](https://appshunter.io/developer/888645337) |

## What reviewers say

### 21 Day Challenge

[App page](https://appshunter.io/ios/app/21-day-challenge/id1504278610)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sober Tracker

[App page](https://appshunter.io/ios/app/sober-tracker-quit-drinking/id6741011041)

This app helps individuals build and maintain sobriety by tracking daily progress, financial savings, and mood. It offers a private, account-free experience with customizable goals and a supportive coping toolkit.

**Highlights:** Daily check-in with streak counter, Financial savings tracker, Mood journaling, Achievement system, Health benefits timeline, Coping toolkit, Garden visualization

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium+ | $2.99 | per month |
| Premium | $2.99 | per month |
| Sober Tracker Premium Weekly | $3.99 | per 7 days |
| Sober Tracker Premium | $6.99 | per month |
| Sober Tracker Premium Yearly | $24.99 | per year |
| Premium+ | $24.99 | per year |
| Premium | $34.99 | one-time |
| Premium | $39.99 | one-time |
| Lifetime Access | $49.99 | one-time |


## Frequently asked questions

### Is 21 Day Challenge free?

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

### Is Sober Tracker free?

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

### Do 21 Day Challenge or Sober Tracker have ads?

Neither 21 Day Challenge nor Sober Tracker shows ads.

### Which is updated more often, 21 Day Challenge or Sober Tracker?

21 Day Challenge ships an update every 9 months, and Sober Tracker every 4 days. Most recently, 21 Day Challenge was updated on September 16, 2026 and Sober Tracker on September 26, 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.*