# Zero Fast vs Aayu

The clearest difference is in-app purchases: Aayu at none against Zero Fast's 2. Aayu also leads on update cadence (every 3 days vs every 2 weeks) and iOS requirement (15.1 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. Zero Fast sells 2 in-app purchases, starting at $6.99 per month. Aayu asks for nothing beyond the download.

Zero Fast ships an update every 2 weeks, Aayu every 3 days. The most recent releases landed on October 3, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Zero Fast | Aayu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zero-fast-fasting-tracker/id6748047745/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 35 MB | 54 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [APPE LATTE LIMITED](https://appshunter.io/developer/1480686912) | [Aayu Wellness Ltd](https://appshunter.io/developer/6775842467) |

## What reviewers say

### Zero Fast

[App page](https://appshunter.io/ios/app/zero-fast-fasting-tracker/id6748047745)

Track your intermittent fasting journey with an AI-powered coach. Get personalized plans, real-time metabolic insights, and science-backed education to support your weight management and metabolic health goals. Log hydration, weight, and mood to optimize your fasting experience.

**Highlights:** AI Fasting Coach, Personalized weekly fasting plans, Multiple fasting profiles, Real-time metabolic tracking, Hydration logging, Weight and progress dashboard, Apple Health integration

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero Fast Monthly | $6.99 | per month |
| Zero Fast Annually | $49.99 | per year |


### Aayu

[App page](https://appshunter.io/ios/app/aayu-intermittent-fasting/id6775842465)

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

**In-app purchases:** none


## Frequently asked questions

### Is Zero Fast free?

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

### Is Aayu free?

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

### Do Zero Fast or Aayu have ads?

Neither Zero Fast nor Aayu shows ads.

### Which is updated more often, Zero Fast or Aayu?

Zero Fast ships an update every 2 weeks, and Aayu every 3 days. Most recently, Zero Fast was updated on October 3, 2026 and Aayu on October 2, 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.*