# Estadio vs 66 Challenge

The clearest difference is in-app purchases: Estadio at none against 66 Challenge's 3. 66 Challenge's advantage is update cadence (every 5 days vs every 5 months) and device support (3 vs 1). On price and ads there is nothing between them.

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

Estadio ships an update every 5 months, 66 Challenge every 5 days. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Estadio | 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 | No |
| Update frequency | Every 5 months | **Every 5 days** |
| Monetization | — | Freemium |
| Size | 30 MB | 18 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Estadio Offices BV](https://appshunter.io/developer/1820281259) | [Moad Ghajjate El Fal](https://appshunter.io/developer/1871890791) |

## What reviewers say

### Estadio

[App page](https://appshunter.io/ios/app/estadio/id6747208991)

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

**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 Estadio free?

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

### Is 66 Challenge free?

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

### Do Estadio or 66 Challenge have ads?

Neither Estadio nor 66 Challenge shows ads.

### Which is updated more often, Estadio or 66 Challenge?

Estadio ships an update every 5 months, and 66 Challenge every 5 days. Most recently, Estadio was updated on October 13, 2026 and 66 Challenge on October 5, 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.*