# FastFlex Fasting Tracker vs ONE

The clearest difference is device support: ONE at 4 against FastFlex Fasting Tracker's 2. On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. FastFlex Fasting Tracker sells 2 in-app purchases, starting at $0.99 per month and ONE sells 6 in-app purchases, starting at $2.99 per 7 days. 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 FastFlex Fasting Tracker against 5.0 for ONE. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

FastFlex Fasting Tracker ships an update every 3 weeks, ONE every 4 weeks. The most recent releases landed on October 7, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | FastFlex Fasting Tracker | ONE |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (2 ratings)](https://appshunter.io/ios/app/fastflex-fasting-tracker/id6756032313/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/oneintermittent-fasting/id6759722688/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 weeks |
| Monetization | Freemium | Freemium |
| Size | 44 MB | 49 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 17+ |
| Developer | [Orkhan Hasanbeck](https://appshunter.io/developer/1858104196) | [Create Rush](https://appshunter.io/developer/1880351509) |

## What reviewers say

### FastFlex Fasting Tracker

[App page](https://appshunter.io/ios/app/fastflex-fasting-tracker/id6756032313)

This app helps you visualize your intermittent fasting progress with a unique visual tracker. It offers various fasting schedules, comprehensive tracking tools, and motivational milestones to keep you engaged. Designed for both beginners and experienced fasters, it focuses on privacy and a clean, intuitive interface.

**Highlights:** Visual progress tracking, Multiple fasting schedules, Customizable fasting durations, Fasting timer with milestones, Journal for insights, Weight tracking, Color-coded history

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastFlex Premium Monthly | $0.99 | per month |
| FastFlex Premium Annual | $9.99 | per year |


### 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 |


## Frequently asked questions

### Is FastFlex Fasting Tracker free?

FastFlex Fasting Tracker is free to download, with in-app purchases available.

### Is ONE free?

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

### Which has better reviews, FastFlex Fasting Tracker or ONE?

FastFlex Fasting Tracker and ONE are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.

### Do FastFlex Fasting Tracker or ONE have ads?

Neither FastFlex Fasting Tracker nor ONE shows ads.

### Which is updated more often, FastFlex Fasting Tracker or ONE?

FastFlex Fasting Tracker ships an update every 3 weeks, and ONE every 4 weeks. Most recently, FastFlex Fasting Tracker was updated on October 7, 2026 and ONE on October 17, 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.*