# 9toFast vs FastFlow

The clearest difference is in-app purchases: FastFlow at none against 9toFast's 3. 9toFast's advantage is update cadence (fortnightly vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 9toFast sells 3 in-app purchases, starting at $0.99 per month. FastFlow asks for nothing beyond the download.

9toFast ships an update fortnightly, FastFlow every 4 months. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | 9toFast | FastFlow |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | — | Ad-supported |
| Size | 47 MB | 34 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Esther Yekini](https://appshunter.io/developer/1847063956) | [Caprio Lab](https://appshunter.io/developer/1841174043) |

## 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 |


### FastFlow

[App page](https://appshunter.io/ios/app/fastflow-fasting-tracker/id6756208094)

This app helps users manage intermittent fasting schedules with a visual timer and customizable patterns. It also allows for weight tracking, meal logging with photos, and smart notifications to build healthy habits.

**Highlights:** Circular fasting timer, Flexible fasting patterns, Weight progress graph, Meal logging with photos, Smart notifications, Cloud data sync

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

**In-app purchases:** none


## Frequently asked questions

### Is 9toFast free?

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

### Is FastFlow free?

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

### Do 9toFast or FastFlow have ads?

Both 9toFast and FastFlow show ads.

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

9toFast ships an update fortnightly, and FastFlow every 4 months. Most recently, 9toFast was updated on September 10, 2026 and FastFlow on September 16, 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.*