# FastFlow vs 天使と悪魔のファスティング

The clearest difference is update cadence: 天使と悪魔のファスティング at every 10 days against FastFlow's every 4 months. FastFlow's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

FastFlow ships an update every 4 months, 天使と悪魔のファスティング every 10 days. The most recent releases landed on September 16, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | FastFlow | 天使と悪魔のファスティング |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | Ad-supported | — |
| Size | 34 MB | 51 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Caprio Lab](https://appshunter.io/developer/1841174043) | [RYOJI TAKAHASHI](https://appshunter.io/developer/1893085921) |

## What reviewers say

### 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


### 天使と悪魔のファスティング

[App page](https://appshunter.io/ios/app/id6764084190)

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

**In-app purchases:** none


## Frequently asked questions

### Is FastFlow free?

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

### Is 天使と悪魔のファスティング free?

天使と悪魔のファスティング is free to download, with no in-app purchases.

### Do FastFlow or 天使と悪魔のファスティング have ads?

Both FastFlow and 天使と悪魔のファスティング show ads.

### Which is updated more often, FastFlow or 天使と悪魔のファスティング?

FastFlow ships an update every 4 months, and 天使と悪魔のファスティング every 10 days. Most recently, FastFlow was updated on September 16, 2026 and 天使と悪魔のファスティング on September 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.*