# Easlo Experiments vs 66 Challenge

The clearest difference is rating: 66 Challenge at 5.0 against Easlo Experiments's 4.6. 66 Challenge also leads on update cadence (every 5 days vs every 3 weeks) and iOS requirement (13.0 vs 17.0). Easlo Experiments's advantage is ratings volume (22 vs 5). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Easlo Experiments sells 1 one-off in-app purchase and 66 Challenge sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

66 Challenge holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 22 and 5 respectively.

Easlo Experiments ships an update every 3 weeks, 66 Challenge every 5 days. The most recent releases landed on September 11, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | Easlo Experiments | 66 Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (22 ratings)](https://appshunter.io/ios/app/easlo-experiments/id6743023810/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/66-challenge/id6758270405/reviews)** |
| Number of ratings | **22** | 5 |
| Positive reviews | 89.7% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 5 MB | 18 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Easlo Pte. Ltd.](https://appshunter.io/developer/1800901637) | [Moad Ghajjate El Fal](https://appshunter.io/developer/1871890791) |

## What reviewers say

### Easlo Experiments

[App page](https://appshunter.io/ios/app/easlo-experiments/id6743023810)

This app encourages an experimenter mindset for personal growth. Track new habits, routines, or products for a set duration, logging progress and observations. Review your trials to decide if they fit your life.

**Highlights:** Set custom experiment frequency and duration, Log progress with notes and photos, Home screen widgets for mindfulness, Assign reminders for experiments, Review and reflect on experiment outcomes

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Experiments Pro | $9.99 | one-time |


### 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 Easlo Experiments free?

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

### Is 66 Challenge free?

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

### Which has better reviews, Easlo Experiments or 66 Challenge?

66 Challenge is rated higher. Easlo Experiments averages 4.6 out of 5 from 22 ratings, while 66 Challenge averages 5.0 from 5 ratings.

### Do Easlo Experiments or 66 Challenge have ads?

Neither Easlo Experiments nor 66 Challenge shows ads.

### Which is updated more often, Easlo Experiments or 66 Challenge?

Easlo Experiments ships an update every 3 weeks, and 66 Challenge every 5 days. Most recently, Easlo Experiments was updated on September 11, 2026 and 66 Challenge on September 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.*