# Fast Slow vs Fast Track Pro

The clearest difference is update cadence: Fast Slow at every 2 weeks against Fast Track Pro's every 3 months. Fast Track Pro's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement 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 Fast Track Pro sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Fast Slow ships an update every 2 weeks, Fast Track Pro every 3 months. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Fast Slow | Fast Track Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (36 ratings)](https://appshunter.io/ios/app/fast-slow-fasting-tracker/id6749188352/reviews)** | — |
| Number of ratings | **36** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 23 MB | 6 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Zan Cerne](https://appshunter.io/developer/1747198932) | [Shankar Dutt](https://appshunter.io/developer/1866130658) |

## 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 |


### Fast Track Pro

[App page](https://appshunter.io/ios/app/fast-track-pro/id6760285351)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastTrack Premium Monthly | $4.99 | per month |
| FastTrack Premium Yearly | $24.99 | per year |
| FastTrack Lifetime | $49.99 | one-time |


## Frequently asked questions

### Is Fast Slow free?

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

### Is Fast Track Pro free?

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

### Do Fast Slow or Fast Track Pro have ads?

Neither Fast Slow nor Fast Track Pro shows ads.

### Which is updated more often, Fast Slow or Fast Track Pro?

Fast Slow ships an update every 2 weeks, and Fast Track Pro every 3 months. Most recently, Fast Slow was updated on October 17, 2026 and Fast Track Pro on October 13, 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.*