# InterFasting vs Fast

The clearest difference is update cadence: InterFasting at every 4 days against Fast's every 9 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. InterFasting sells 3 in-app purchases, starting at $3.99 per month and Fast sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

InterFasting ships an update every 4 days, Fast every 9 months. The most recent releases landed on October 14, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | InterFasting | Fast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (344 ratings)](https://appshunter.io/ios/app/interfasting-fasting-tracker/id1467464443/reviews)** | — |
| Number of ratings | **344** | — |
| Positive reviews | 88.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 4 days** | Every 9 months |
| Monetization | Free with in-app purchases | — |
| Size | 99 MB | 76 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Liviet](https://appshunter.io/developer/1464827169) | [kota tada](https://appshunter.io/developer/1658942612) |

## 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 (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium 1 month | $3.99 | per month |
| Gandan Premium Annual | $12.99 | per year |
| Premium User | $12.99 | one-time |


### Fast

[App page](https://appshunter.io/ios/app/fast-fasting-timer/id6743695812)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ad-free for 1 month | $4.99 | per month |
| Ad-free for 1 year | $49.99 | per year |


## Frequently asked questions

### Is InterFasting free?

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

### Is Fast free?

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

### Do InterFasting or Fast have ads?

Both InterFasting and Fast show ads.

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

InterFasting ships an update every 4 days, and Fast every 9 months. Most recently, InterFasting was updated on October 14, 2026 and Fast on October 15, 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.*