# WaterFast vs Ayuno

The clearest difference is iOS requirement: WaterFast at 17.0 against Ayuno's 26.0. On price, rating, ratings volume and update cadence there is nothing between them.

Both are free to download. WaterFast sells 3 in-app purchases, starting at $2.99 per month and Ayuno sells 2 in-app purchases, starting at $3.99 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 WaterFast against 5.0 for Ayuno. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

WaterFast ships an update weekly, Ayuno every 4 days. The most recent releases landed on November 3, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | WaterFast | Ayuno |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/waterfast-if-fasting-timer/id6787013484/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/ayuno-intermittent-fasting/id6787856522/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Freemium | Freemium |
| Size | 3 MB | 4 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | +4 | 12+ |
| Developer | [LUIS ORLANDO LAZO GONZALEZ](https://appshunter.io/developer/1896012382) | [Brandon Duncan](https://appshunter.io/developer/1858118962) |

## What reviewers say

### 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 (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| WaterFast PRO Monthly | $2.99 | per month |
| WaterFast PRO Yearly | $9.99 | per year |
| WaterFast PRO Lifetime | $24.99 | one-time |


### Ayuno

[App page](https://appshunter.io/ios/app/ayuno-intermittent-fasting/id6787856522)

This app helps users build consistent intermittent fasting habits with a simple timer, health guidance, and progress tracking. It offers premium features like journaling, detailed insights, and personalized coaching.

**Highlights:** Simple fasting timer, Health-conscious guidance, Journaling (Premium), Progress logging (Premium), Meaningful insights (Premium), Apple Health integration, Live Activities & Widgets (Premium)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $3.99 | per month |
| Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is WaterFast free?

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

### Is Ayuno free?

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

### Which has better reviews, WaterFast or Ayuno?

WaterFast and Ayuno are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do WaterFast or Ayuno have ads?

Neither WaterFast nor Ayuno shows ads.

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

WaterFast ships an update weekly, and Ayuno every 4 days. Most recently, WaterFast was updated on November 3, 2026 and Ayuno on October 21, 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.*