# FastLyfe vs WaterFast

The clearest difference is update cadence: WaterFast at weekly against FastLyfe's every 6 weeks. FastLyfe's advantage is iOS requirement (13.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FastLyfe sells 3 in-app purchases, starting at $5.99 per month and WaterFast sells 2 in-app purchases, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

FastLyfe ships an update every 6 weeks, WaterFast weekly. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | FastLyfe | WaterFast |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/waterfast-if-fasting-timer/id6787013484/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | — | Freemium |
| Size | 31 MB | 3 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Cayden Williams](https://appshunter.io/developer/1870369963) | [LUIS ORLANDO LAZO GONZALEZ](https://appshunter.io/developer/1896012382) |

## What reviewers say

### FastLyfe

[App page](https://appshunter.io/ios/app/fastlyfe-fasting-tracker/id6762158215)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Yearly | $16.99 | per year |
| Lifetime Pro | $29.99 | one-time |


### WaterFast

[App page](https://appshunter.io/ios/app/waterfast-if-fasting-timer/id6787013484)

This app provides a synchronized intermittent fasting timer designed for seamless use across your iPhone and Apple Watch. It offers detailed insights into fasting zones and hydration tracking, with a focus on privacy and a user-friendly experience.

**Highlights:** Synchronized iPhone and Apple Watch timer, Fasting zone insights, Hydration tracking, Multiple fasting plans, Streak calendar, Data export

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WaterFast PRO Yearly | $9.99 | per year |
| WaterFast PRO Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is FastLyfe free?

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

### Is WaterFast free?

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

### Do FastLyfe or WaterFast have ads?

Neither FastLyfe nor WaterFast shows ads.

### Which is updated more often, FastLyfe or WaterFast?

FastLyfe ships an update every 6 weeks, and WaterFast weekly. Most recently, FastLyfe was updated on October 20, 2026 and WaterFast on October 6, 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.*