# One Step Challenges vs Fast12

The clearest difference is update cadence: One Step Challenges at every 3 days against Fast12's every 10 days. One Step Challenges also leads on iOS requirement (15.1 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. One Step Challenges sells 2 in-app purchases, starting at $4.99 per month and Fast12 sells 2 in-app purchases, starting at $12.99 per month. Whichever you choose, the download price is not the number that matters.

One Step Challenges ships an update every 3 days, Fast12 every 10 days. The most recent releases landed on October 28, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | One Step Challenges | Fast12 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 10 days |
| Monetization | — | Freemium |
| Size | 30 MB | 29 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 12+ | 17+ |
| Developer | [JUSTIN MORGAN MAYEUR](https://appshunter.io/developer/1896273983) | [D App Online Ltd](https://appshunter.io/developer/1442403007) |

## What reviewers say

### One Step Challenges

[App page](https://appshunter.io/ios/app/one-step-challenges/id6766305390)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Step Pro Monthly | $4.99 | per month |
| One Step Pro Annual | $34.99 | per year |


### Fast12

[App page](https://appshunter.io/ios/app/fast12-intermittent-fasting/id6770261704)

Build a sustainable fasting routine with a simple timer and personalized coaching. Track your fasting window, hydration, and sleep to understand your body's rhythms. Features AI meal scanning and meal guidance to support your eating window.

**Highlights:** Simple fasting timer, Beginner-friendly 12-hour fast, Smart fasting insights, Personal coaching, Hydration tracking, AI Meal Photo Scanner, Apple Watch support

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Fast12 Premium Monthly | $12.99 | per month |
| Fast12 Premium Annual | $49.99 | per year |


## Frequently asked questions

### Is One Step Challenges free?

One Step Challenges is free to download, with in-app purchases available.

### Is Fast12 free?

Fast12 is free to download, with in-app purchases available.

### Do One Step Challenges or Fast12 have ads?

Neither One Step Challenges nor Fast12 shows ads.

### Which is updated more often, One Step Challenges or Fast12?

One Step Challenges ships an update every 3 days, and Fast12 every 10 days. Most recently, One Step Challenges was updated on October 28, 2026 and Fast12 on October 13, 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.*