# InterFasting vs Atomic Fast

The clearest difference is ads: Atomic Fast at none against InterFasting's shown. Atomic Fast also leads on rating (5.0 vs 4.8). InterFasting's advantage is ratings volume (352 vs 29) and iOS requirement (15.0 vs 18.0). On price, review sentiment, update cadence and in-app purchases there is nothing between them.

Both are free to download. InterFasting sells 5 in-app purchases, starting at $3.99 per month and Atomic Fast sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Atomic Fast holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: InterFasting has 352 ratings behind it against 29, so its average is the more settled of the two. Written reviews point the same way: 89% of InterFasting's written reviews are positive against 96% of Atomic Fast's.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | InterFasting | Atomic Fast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (352 ratings)](https://appshunter.io/ios/app/interfasting-fasting-tracker/id1467464443/reviews) | **[5.0 (29 ratings)](https://appshunter.io/ios/app/atomic-fast-fasting-and-diet/id6763870543/reviews)** |
| Number of ratings | **352** | 29 |
| Positive reviews | 88.6% of reviews | **96.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | Every 4 days |
| Monetization | Free with in-app purchases | Freemium |
| Size | 99 MB | 22 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Liviet](https://appshunter.io/developer/1464827169) | [Startise](https://appshunter.io/developer/1895534080) |

## What reviewers say

### InterFasting

[App page](https://appshunter.io/ios/app/interfasting-fasting-tracker/id1467464443)

This app helps users succeed with intermittent fasting through scientific and systematic management. It offers AI-powered schedule and calorie recommendations, a simple timer, and comprehensive tracking of fasting hours, meals, workouts, and water intake. Users can visualize progress and receive detailed reports to build healthy habits.

**Highlights:** AI fasting schedule recommendations, AI food calorie calculation, Intermittent fasting timer, Customizable fasting plans, All-in-one health tracking, Fasting analysis and reports, Home screen widget

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Intermittent Fasting Monthly | $3.99 | per month |
| Intermittent Fasting Monthly | $6.99 | per month |
| Intermittent Fasting Annual | $12.99 | per year |
| Intermittent Fasting Annual | $34.99 | per year |
| Premium User | $12.99 | one-time |


### Atomic Fast

[App page](https://appshunter.io/ios/app/atomic-fast-fasting-and-diet/id6763870543)

This app combines intermittent fasting with AI-powered calorie and macro tracking. It analyzes your eating patterns, hydration, sleep, and activity to provide metabolic insights and a daily readiness score. Seamlessly integrates with Apple Health for a holistic view of your well-being.

**Highlights:** AI calorie and macro estimation from photos, Intermittent fasting timer with metabolic phases, Break-fast meal scoring and suggestions, Connects meals and fasts for holistic insights, Daily readiness score based on health signals, Apple Health and Apple Watch integration

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Atomic+ Monthly | $4.99 | per month |
| Atomic+ Annual | $29.99 | per year |
| Atomic+ Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is InterFasting free?

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

### Is Atomic Fast free?

Atomic Fast is free to download, with in-app purchases available.

### Which has better reviews, InterFasting or Atomic Fast?

Atomic Fast is rated higher. InterFasting averages 4.8 out of 5 from 352 ratings, while Atomic Fast averages 5.0 from 29 ratings.

### Do InterFasting or Atomic Fast have ads?

InterFasting shows ads; Atomic Fast does not.

### Which is updated more often, InterFasting or Atomic Fast?

InterFasting ships an update every 4 days, and Atomic Fast every 4 days. Most recently, InterFasting was updated on October 25, 2026 and Atomic Fast on October 21, 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.*