# 21 Day Challenge vs Quitly

The clearest difference is in-app purchases: 21 Day Challenge at none against Quitly's 1. 21 Day Challenge also leads on iOS requirement (9.0 vs 16.0). Quitly's advantage is update cadence (fortnightly vs every 9 months). On price, ads and device support there is nothing between them.

Both are free to download. Quitly sells 1 one-off in-app purchase. 21 Day Challenge asks for nothing beyond the download.

21 Day Challenge ships an update every 9 months, Quitly fortnightly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 21 Day Challenge | Quitly |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/quitly-quit-tracking/id6446411814/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 99 MB | 54 MB |
| Requires iOS | **9.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Phanupong Sanmee](https://appshunter.io/developer/1435296424) | [Lightli LTD](https://appshunter.io/developer/1677809408) |

## What reviewers say

### 21 Day Challenge

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Quitly

[App page](https://appshunter.io/ios/app/quitly-quit-tracking/id6446411814)

This app helps you break free from bad habits by tracking your progress with stopwatch-style timers. Monitor multiple habits, set goals, and celebrate milestones with customizable alerts and relapse tracking. Stay motivated on your journey to freedom.

**Highlights:** Multiple habit timers, Relapse history tracking, Custom milestone alerts, Target goal setting, Cloud sync across devices, Distraction-free design

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | one-time |


## Frequently asked questions

### Is 21 Day Challenge free?

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

### Is Quitly free?

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

### Do 21 Day Challenge or Quitly have ads?

Neither 21 Day Challenge nor Quitly shows ads.

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

21 Day Challenge ships an update every 9 months, and Quitly fortnightly. Most recently, 21 Day Challenge was updated on October 27, 2026 and Quitly on October 24, 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.*