# ONE vs Vasten

The clearest difference is in-app purchases: Vasten at none against ONE's 6. Vasten also leads on update cadence (every 2 days vs every 4 weeks). ONE's advantage is device support (4 vs 1) and iOS requirement (15.1 vs 26.5). On price and ads there is nothing between them.

Both are free to download. ONE sells 6 in-app purchases, starting at $2.99 per 7 days. Vasten asks for nothing beyond the download.

ONE ships an update every 4 weeks, Vasten every 2 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | ONE | Vasten |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/oneintermittent-fasting/id6759722688/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 49 MB | 2 MB |
| Requires iOS | **15.1** | 26.5 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Create Rush](https://appshunter.io/developer/1880351509) | [Dennis Van Dalen](https://appshunter.io/developer/1862992231) |

## What reviewers say

### ONE

[App page](https://appshunter.io/ios/app/oneintermittent-fasting/id6759722688)

This app simplifies intermittent fasting with a one-tap timer and progress tracker. It guides users through fasting stages, offers various plans, and provides insights into body changes. The focus is on building consistent habits without unnecessary complexity.

**Highlights:** One-tap fasting timer, Live fasting stage tracking, Multiple fasting plan options, Daily streak tracking, Weight and water tracking, AI-powered progress summaries, Offline functionality

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Standard Weekly | $2.99 | per 7 days |
| Premium Weekly | $4.99 | per 7 days |
| Standard Monthly | $4.99 | per month |
| Premium Monthly | $9.99 | per month |
| Standard Yearly | $49.99 | per year |
| Premium Yearly | $99.99 | per year |


### Vasten

[App page](https://appshunter.io/ios/app/vasten-fasting-timer/id6791755315)

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

**In-app purchases:** none


## Frequently asked questions

### Is ONE free?

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

### Is Vasten free?

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

### Do ONE or Vasten have ads?

Neither ONE nor Vasten shows ads.

### Which is updated more often, ONE or Vasten?

ONE ships an update every 4 weeks, and Vasten every 2 days. Most recently, ONE was updated on October 31, 2026 and Vasten on October 31, 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.*