# The 21 Days Challenge vs SN3

The clearest difference is in-app purchases: SN3 at none against The 21 Days Challenge's 2. SN3 also leads on ads (none vs shown) and update cadence (every 9 days vs every 4 weeks). The 21 Days Challenge's advantage is device support (3 vs 1). On price and iOS requirement there is nothing between them.

Both are free to download. The 21 Days Challenge sells 2 in-app purchases, starting at $2.99 per month. SN3 asks for nothing beyond the download.

The 21 Days Challenge ships an update every 4 weeks, SN3 every 9 days. The most recent releases landed on November 7, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | The 21 Days Challenge | SN3 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (575 ratings)](https://appshunter.io/ios/app/the-21-days-challenge/id1485458184/reviews)** | — |
| Number of ratings | **575** | — |
| Positive reviews | 92.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 4 weeks | **Every 9 days** |
| Monetization | Free with in-app purchases | — |
| Size | 128 MB | 48 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kati Pereira](https://appshunter.io/developer/1697931524) | [ALIF Solutions DMCC](https://appshunter.io/developer/1574844536) |

## What reviewers say

### The 21 Days Challenge

[App page](https://appshunter.io/ios/app/the-21-days-challenge/id1485458184)

Build life-changing habits with guided 21-day challenges. Track progress, journal your thoughts, and customize your avatar with earned points. Improve your mental well-being and create a happier lifestyle.

**Highlights:** Guided 21-day habit challenges, Daily journaling and mood tracking, Avatar customization with earned points, Community feed for gratitude sharing, Positive affirmations and wallpapers, Daily task completion tracking, Customizable daily reminders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads month | $2.99 | per month |
| Remove Ads Year | $24.99 | per year |

**What reviewers like**

- 🚀 Simple and motivating
- 👍 Clean design and clear progress tracking
- 🤗 Genuinely helpful and enjoyable to use
- 💫 Positive impact on mental health and habits
- 🌟 Inspirational and encouraging messages

**What reviewers complain about**

- 🔍 Lack of search option in community challenges
- 🔀 Challenges disappear after creation, no way to find them
- 🤖 Too many ads interrupting the experience
- 🎨 App could use more customization options

**Reported bugs**

- Sharing created challenges does not work as expected
- Challenges sometimes disappear from the app

**Requested features**

- Add a search function for community challenges
- Allow users to save and revisit their own created challenges
- Provide more customization options for the app and user profile
- Introduce a widget for easier access to daily tasks


### SN3

[App page](https://appshunter.io/ios/app/sn3/id6475007888)

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

**In-app purchases:** none


## Frequently asked questions

### Is The 21 Days Challenge free?

The 21 Days Challenge is free to download, with in-app purchases available.

### Is SN3 free?

SN3 is free to download, with no in-app purchases.

### Do The 21 Days Challenge or SN3 have ads?

The 21 Days Challenge shows ads; SN3 does not.

### Which is updated more often, The 21 Days Challenge or SN3?

The 21 Days Challenge ships an update every 4 weeks, and SN3 every 9 days. Most recently, The 21 Days Challenge was updated on November 7, 2026 and SN3 on November 4, 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.*