# 9toFast vs FastZen

The clearest difference is ads: FastZen at none against 9toFast's shown. 9toFast's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. 9toFast sells 3 in-app purchases, starting at $0.99 per month and FastZen sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

9toFast ships an update fortnightly, FastZen weekly. Both last shipped on October 28, 2026.

## The numbers

| Metric | 9toFast | FastZen |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 47 MB | 2 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Esther Yekini](https://appshunter.io/developer/1847063956) | [Benjamin Dupin](https://appshunter.io/developer/1871474236) |

## What reviewers say

### 9toFast

[App page](https://appshunter.io/ios/app/9tofast/id6754204142)

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $9.99 | per year |
| Premium Lifetime | $19.99 | one-time |


### FastZen

[App page](https://appshunter.io/ios/app/fastzen-fasting-timer/id6761484595)

This app helps you manage your fasting schedule with customizable timers and reminders. It offers a recurring weekly routine, a timer that remembers your progress, and a clear view of your active fast. Review your history and track your streaks, all while keeping your data private on your device.

**Highlights:** Customizable fasting schedules, Recurring weekly routine setup, Live Activities for active fast tracking, Detailed fasting history and streaks, No account, ads, or server sync, Custom Week one-time purchase

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee | $0.99 | one-time |
| Thanks | $2.99 | one-time |
| Support development | $4.99 | one-time |
| FastZen Custom Week | $5.99 | one-time |


## Frequently asked questions

### Is 9toFast free?

9toFast is free to download, with in-app purchases available.

### Is FastZen free?

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

### Do 9toFast or FastZen have ads?

9toFast shows ads; FastZen does not.

### Which is updated more often, 9toFast or FastZen?

9toFast ships an update fortnightly, and FastZen weekly. Most recently, 9toFast was updated on October 28, 2026 and FastZen on October 28, 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.*