# FastKit vs Aayu

The clearest difference is in-app purchases: Aayu at none against FastKit's 6. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. FastKit sells 6 in-app purchases, starting at $1.99 per 7 days. Aayu asks for nothing beyond the download.

FastKit ships an update every 5 days, Aayu every 4 days. The most recent releases landed on October 7, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | FastKit | Aayu |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/aayu-intermittent-fasting/id6775842465/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 10 MB | 77 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Anatoli Niculeac](https://appshunter.io/developer/1788751874) | [Aayu Wellness Ltd](https://appshunter.io/developer/6775842467) |

## What reviewers say

### FastKit

[App page](https://appshunter.io/ios/app/fastkit-fasting-timer/id6740176968)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3-Day Trial | $1.99 | per 7 days |
| Premium Weekly | $2.99 | per 7 days |
| Monthly | $2.99 | per month |
| Premium Monthly | $9.99 | per month |
| Yearly Plan | $14.99 | per year |
| Premium Yearly | $34.99 | per year |


### Aayu

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

Track your body's metabolic zones in real-time during fasting to understand progress beyond simple timers. Offers personalized plans, hydration tracking, and curated meal ideas to support your weight loss journey. Advanced features are available through an optional subscription.

**Highlights:** Real-time metabolic zone tracking, Personalized fasting plans, Curated break-fast meal suggestions, Hydration and step tracking, Metabolic discipline score, Learn library of fasting articles

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

**In-app purchases:** none


## Frequently asked questions

### Is FastKit free?

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

### Is Aayu free?

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

### Do FastKit or Aayu have ads?

Neither FastKit nor Aayu shows ads.

### Which is updated more often, FastKit or Aayu?

FastKit ships an update every 5 days, and Aayu every 4 days. Most recently, FastKit was updated on October 7, 2026 and Aayu on October 18, 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.*