# Fast Slow vs Fasting Timer

The clearest difference is in-app purchases: Fasting Timer at none against Fast Slow's 4. Fasting Timer also leads on update cadence (every 2 days vs every 2 weeks) and device support (3 vs 1). Fast Slow's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. Fast Slow sells 4 in-app purchases, starting at $1.99 per 7 days. Fasting Timer asks for nothing beyond the download.

Fast Slow ships an update every 2 weeks, Fasting Timer every 2 days. The most recent releases landed on October 1, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Fast Slow | Fasting Timer |
| --- | --- | --- |
| 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 | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 23 MB | 23 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Zan Cerne](https://appshunter.io/developer/1747198932) | [SEOKWON YANG](https://appshunter.io/developer/1863325487) |

## 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 |


### Fasting Timer

[App page](https://appshunter.io/ios/app/fasting-timer-slox/id6777732517)

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

**In-app purchases:** none


## Frequently asked questions

### Is Fast Slow free?

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

### Is Fasting Timer free?

Fasting Timer is free to download, with no in-app purchases.

### Do Fast Slow or Fasting Timer have ads?

Fasting Timer shows ads; Fast Slow does not.

### Which is updated more often, Fast Slow or Fasting Timer?

Fast Slow ships an update every 2 weeks, and Fasting Timer every 2 days. Most recently, Fast Slow was updated on October 1, 2026 and Fasting Timer on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*