# Fast AI vs Harmony Fasting

The clearest difference is review sentiment: Harmony Fasting at 93% against Fast AI's 7%. Harmony Fasting also leads on rating (4.7 vs 4.3). Fast AI's advantage is ratings volume (120 vs 31). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Fast AI sells 5 in-app purchases, starting at $5.99 per 7 days and Harmony Fasting sells 10 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Harmony Fasting holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 120 and 31 respectively. Written reviews point the same way: 7% of Fast AI's written reviews are positive against 93% of Harmony Fasting's.

Fast AI ships an update every 2 weeks, Harmony Fasting fortnightly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Fast AI | Harmony Fasting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (120 ratings)](https://appshunter.io/ios/app/fast-ai-intermittent-fasting/id1629661646/reviews) | **[4.7 (31 ratings)](https://appshunter.io/ios/app/harmony-fasting/id6467765098/reviews)** |
| Number of ratings | **120** | 31 |
| Positive reviews | 7.1% of reviews | **92.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 101 MB | 22 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kiryl Salavei](https://appshunter.io/developer/1033680093) | [Zaplq OU](https://appshunter.io/developer/1779504511) |

## What reviewers say

### Fast AI

[App page](https://appshunter.io/ios/app/fast-ai-intermittent-fasting/id1629661646)

This app helps users achieve weight loss and improve well-being through intermittent fasting. It provides tracking, scheduling, and detailed analytics to guide users through various fasting plans. The app aims to make fasting a natural and effective part of a healthy lifestyle.

**Highlights:** Intermittent fasting tracker, Weight monitoring, Fasting and food window notifications, Detailed analytics, Multiple fasting schemes (e.g., 16/8), Fasting schedule, Apple Health weight sync

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Simple intermittent fasting | $5.99 | per 7 days |
| Intermittent Fasting 1 Month | $12.99 | per month |
| Personal Fast Program 3 Month | $19.99 | per 3 months |
| Intermittent Fasting + Tracker | $35.99 | per year |
| Intermittent Fasting Annual | $49.99 | per year |


### Harmony Fasting

[App page](https://appshunter.io/ios/app/harmony-fasting/id6467765098)

This app helps you track intermittent fasting for various health and weight loss goals. It allows you to set personal information, choose fasting routines, and monitor your progress with a timer and reminders. It supports different fasting types and offers customizable levels.

**Highlights:** Fasting Timer, Personalized Profile, Fasting Levels, Customizable Levels, Goal Timer, Apple Health Integration

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $0.99 | per 7 days |
| Unlimited Access | $6.99 | per 7 days |
| Premium | $9.99 | per 7 days |
| Premium | $11.99 | per month |
| Premium Access | $19.99 | per month |
| Premium | $29.99 | per month |
| Premium Access | $34.99 | per month |
| Premium Access | $49.99 | per 3 months |
| Premium Access | $59.99 | per year |
| Premium | $69.99 | per year |


## Frequently asked questions

### Is Fast AI free?

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

### Is Harmony Fasting free?

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

### Which has better reviews, Fast AI or Harmony Fasting?

Harmony Fasting is rated higher. Fast AI averages 4.3 out of 5 from 120 ratings, while Harmony Fasting averages 4.7 from 31 ratings.

### Do Fast AI or Harmony Fasting have ads?

Neither Fast AI nor Harmony Fasting shows ads.

### Which is updated more often, Fast AI or Harmony Fasting?

Fast AI ships an update every 2 weeks, and Harmony Fasting fortnightly. Most recently, Fast AI was updated on November 3, 2026 and Harmony Fasting on November 3, 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.*