# XFM Toolbox vs 66 Challenge

The clearest difference is in-app purchases: XFM Toolbox at none against 66 Challenge's 3. 66 Challenge's advantage is device support. On price and iOS requirement there is nothing between them.

Both are free to download. 66 Challenge sells 3 in-app purchases, starting at $3.99 per month. XFM Toolbox asks for nothing beyond the download.

## The numbers

| Metric | XFM Toolbox | 66 Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/66-challenge/id6758270405/reviews)** |
| Number of ratings | — | **5** |
| In-app purchases | **No** | Yes |
| Ads | — | No |
| Update frequency | — | Every 5 days |
| Monetization | — | Freemium |
| Size | 27 MB | 18 MB |
| Requires iOS | 14.1 | **13.0** |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [X-Bike B.V.](https://appshunter.io/developer/1445887980) | [Moad Ghajjate El Fal](https://appshunter.io/developer/1871890791) |

## What reviewers say

### XFM Toolbox

[App page](https://appshunter.io/ios/app/xfm-toolbox/id6445990563)

**In-app purchases:** none


### 66 Challenge

[App page](https://appshunter.io/ios/app/66-challenge/id6758270405)

Build lasting habits with a science-backed system designed to guide you through a 66-day journey. Track daily progress, visualize your transformation, and stay motivated with social features and achievements. Transform your life one habit at a time.

**Highlights:** Daily habit tracking, Progress visualization, Streak protection, Social feed and squads, Customizable reminders, Achievement badges

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $3.99 | per month |
| Pro Annual | $29.99 | per year |
| Pro Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is XFM Toolbox free?

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

### Is 66 Challenge free?

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

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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.*