# Murror AI vs 21 Days Challenge

The clearest difference is in-app purchases: 21 Days Challenge at none against Murror AI's 2. 21 Days Challenge also leads on iOS requirement (13.0 vs 15.5). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Murror AI sells 2 in-app purchases, starting at $12.99 per month. 21 Days Challenge asks for nothing beyond the download.

Murror AI ships an update weekly, 21 Days Challenge every 10 days. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Murror AI | 21 Days Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (6 ratings)](https://appshunter.io/ios/app/murror-ai/id6741769381/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | Subscription | — |
| Size | 125 MB | 46 MB |
| Requires iOS | 15.5 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Murror](https://appshunter.io/developer/1680088327) | [Tung Bui Thanh](https://appshunter.io/developer/1504830403) |

## What reviewers say

### Murror AI

[App page](https://appshunter.io/ios/app/murror-ai/id6741769381)

This AI-powered companion helps young individuals build deeper connections with themselves and others. It offers guided conversations, journaling, and insights to foster self-understanding and improve relationships.

**Highlights:** AI-powered companion, Build quality relationships, Grow authentic self, Diary insights, AI-curated knowledge articles, Reflective conversations with AI, Journaling for self-acceptance

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Murror Premium | $12.99 | per month |
| Murror Premium | $89.99 | per year |


### 21 Days Challenge

[App page](https://appshunter.io/ios/app/21-days-challenge/id6753333556)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Murror AI free?

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

### Is 21 Days Challenge free?

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

### Do Murror AI or 21 Days Challenge have ads?

Neither Murror AI nor 21 Days Challenge shows ads.

### Which is updated more often, Murror AI or 21 Days Challenge?

Murror AI ships an update weekly, and 21 Days Challenge every 10 days. Most recently, Murror AI was updated on October 24, 2026 and 21 Days Challenge on October 9, 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.*