# Fast Slow vs Intermittent

Fast Slow and Intermittent both sit at 5.0 stars, but that hides the real split: 100% of Fast Slow's written reviews are positive against 50% of Intermittent's. Fast Slow also leads on monetization model (free vs freemium). Intermittent's advantage is update cadence (every 4 days vs fortnightly) and device support (3 vs 1). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Fast Slow sells 4 in-app purchases, starting at $1.99 per 7 days and Intermittent sells 4 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Fast Slow against 5.0 for Intermittent. Both are backed by a comparable volume of ratings — 22 and 9 respectively. Written reviews are what separate them: 100% of Fast Slow's written reviews are positive against 50% of Intermittent's.

Fast Slow ships an update fortnightly, Intermittent every 4 days. The most recent releases landed on September 13, 2026 and August 20, 2026 respectively.

## The numbers

| Metric | Fast Slow | Intermittent |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (22 ratings)](https://appshunter.io/ios/app/fast-slow-fasting-tracker/id6749188352/reviews) | [5.0 (9 ratings)](https://appshunter.io/ios/app/intermittent-fasting-tracker-plus/id6756629485/reviews) |
| Number of ratings | **22** | 9 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Monetization | **Free** | Freemium |
| Size | 19 MB | 33 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 12+ |
| Developer | [Zan Cerne](https://appshunter.io/developer/1747198932) | [BARBAROS SELIM BUYUKELCI](https://appshunter.io/developer/1861903946) |

## What reviewers say

### Fast Slow

[App page](https://appshunter.io/ios/app/fast-slow-fasting-tracker/id6749188352)

Understand your body's metabolic changes during fasting with a visual timeline. This free app guides you through different fasting zones, from digestion to deep ketosis, and offers customizable schedules and smart notifications. It provides stats, streaks, and widgets for easy progress tracking.

**Highlights:** Fasting timer with visual timeline, 6 customizable fasting schedules, 5 distinct fasting zones explained, Smart notifications for fasting windows, Stats, streaks, and trends tracking, Home and Lock Screen widgets, Siri Shortcuts integration

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Legacy | $1.99 | per 7 days |
| Legacy - Yearly | $12.99 | per year |
| Buy Me a Coffee | $2.99 | one-time |
| You're Amazing | $9.99 | one-time |


### Intermittent

[App page](https://appshunter.io/ios/app/intermittent-fasting-tracker-plus/id6756629485)

Easily track your intermittent fasting with a visual timeline and preset or custom plans. Integrate with Apple Health for a holistic view of your wellness. Stay updated with widgets and Apple Watch support.

**Highlights:** Fasting timer, Visual stage timeline, Preset and custom plans, Apple Health integration, Apple Watch app, Widgets and Live Activities

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $4.99 | per month |
| 3 Months Premium | $9.99 | per 3 months |
| 6 Months Premium | $24.99 | per 6 months |
| Yearly Premium | $34.99 | per year |


## Frequently asked questions

### Is Fast Slow free?

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

### Is Intermittent free?

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

### Which has better reviews, Fast Slow or Intermittent?

Fast Slow and Intermittent are both rated 5.0 out of 5 on the App Store, from 22 and 9 ratings respectively.

### Do Fast Slow or Intermittent have ads?

Neither Fast Slow nor Intermittent shows ads.

### Which is updated more often, Fast Slow or Intermittent?

Fast Slow ships an update fortnightly, and Intermittent every 4 days. Most recently, Fast Slow was updated on September 13, 2026 and Intermittent on August 20, 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.*