# 21in21 vs Intermittent Fasting

The clearest difference is rating: 21in21 at 5.0 against Intermittent Fasting's 4.5. 21in21 also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). Intermittent Fasting's advantage is update cadence (every 4 days vs every 8 days). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. 21in21 sells 6 one-off in-app purchases and Intermittent Fasting sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

21in21 holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

21in21 ships an update every 8 days, Intermittent Fasting every 4 days. The most recent releases landed on October 21, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 21in21 | Intermittent Fasting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/21in21/id6758403356/reviews)** | [4.5 (2 ratings)](https://appshunter.io/ios/app/intermittent-fasting-cfast/id6793085601/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 42 MB | 35 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Diego Gomez](https://appshunter.io/developer/1872747164) | [Jitender Kumar](https://appshunter.io/developer/6793085604) |

## What reviewers say

### 21in21

[App page](https://appshunter.io/ios/app/21in21/id6758403356)

This app offers a guided 21-day protocol for personal transformation, with daily steps focusing on psychology, action, and reflection. It provides courses for healing heartbreak, improving fitness, digital detox, better sleep, morning routines, and life resets.

**Highlights:** Guided 21-day transformation protocol, Daily actionable steps, Courses for various life changes, Clean and calming interface, Streak tracking, Private journaling, Daily notifications

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Heal Your Heart | $21.00 | one-time |
| A Leaner You | $21.00 | one-time |
| Morning Routine | $21.00 | one-time |
| Life Reset | $21.00 | one-time |
| Better Sleep | $21.00 | one-time |
| Digital Detox | $21.00 | one-time |


### Intermittent Fasting

[App page](https://appshunter.io/ios/app/intermittent-fasting-cfast/id6793085601)

Easily track your intermittent fasting with personalized plans and insights. Monitor progress, stay on schedule, and reach your health goals with a simple interface and helpful tips. Achieve a healthier lifestyle with this comprehensive fasting companion.

**Highlights:** Daily intermittent fasting with 30 plans, Tips to maintain fast period, Fasting insights & timeline, Water, weight & measurement tracker, Achievement badges, Simple user interface

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Buy Monthly Subscription | $1.99 | per month |
| 3 Month Subscription | $4.99 | per 3 months |
| Yearly Subscription | $8.99 | per year |


## Frequently asked questions

### Is 21in21 free?

21in21 is free to download, with in-app purchases available.

### Is Intermittent Fasting free?

Intermittent Fasting is free to download, with in-app purchases available.

### Which has better reviews, 21in21 or Intermittent Fasting?

21in21 is rated higher. 21in21 averages 5.0 out of 5 from 1 ratings, while Intermittent Fasting averages 4.5 from 2 ratings.

### Do 21in21 or Intermittent Fasting have ads?

Neither 21in21 nor Intermittent Fasting shows ads.

### Which is updated more often, 21in21 or Intermittent Fasting?

21in21 ships an update every 8 days, and Intermittent Fasting every 4 days. Most recently, 21in21 was updated on October 21, 2026 and Intermittent Fasting on October 25, 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.*