# KetOne vs FastMode

The clearest difference is update cadence: FastMode at every 3 days against KetOne's every 2 months. FastMode also leads on iOS requirement (15.1 vs 18.2). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. KetOne sells 2 in-app purchases, starting at $19.99 per 3 months and FastMode sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

KetOne ships an update every 2 months, FastMode every 3 days. The most recent releases landed on October 13, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | KetOne | FastMode |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fastmode-fasting-tracker/id6758218794/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 73 MB | 39 MB |
| Requires iOS | 18.2 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Oriana Isabel Leal Ramos](https://appshunter.io/developer/1843461781) | [Bart Goutbeek](https://appshunter.io/developer/1870354103) |

## What reviewers say

### KetOne

[App page](https://appshunter.io/ios/app/ketone-fasting-tracker-easy/id6753320512)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reset Cycle | $19.99 | per 3 months |
| Mastery Cycle | $44.99 | per year |


### FastMode

[App page](https://appshunter.io/ios/app/fastmode-fasting-tracker/id6758218794)

This app simplifies intermittent fasting with an easy-to-use timer and progress tracking. Monitor your fasting schedule, view statistics, and earn badges to stay motivated on your health journey.

**Highlights:** Simple fasting timer, Flexible fasting schedules, Progress statistics, Milestone badges, Apple Health integration, Dark mode

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastMode Pro Monthly | $2.99 | per month |
| FastMode Pro Yearly | $24.99 | per year |


## Frequently asked questions

### Is KetOne free?

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

### Is FastMode free?

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

### Do KetOne or FastMode have ads?

Neither KetOne nor FastMode shows ads.

### Which is updated more often, KetOne or FastMode?

KetOne ships an update every 2 months, and FastMode every 3 days. Most recently, KetOne was updated on October 13, 2026 and FastMode 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.*