# 瘦着呢 vs FastFlow

The clearest difference is ads: 瘦着呢 at none against FastFlow's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. 瘦着呢 sells 3 in-app purchases, starting at $1.99 per month and FastFlow sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

瘦着呢 ships an update every 8 days, FastFlow every 5 days. The most recent releases landed on October 7, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | 瘦着呢 | FastFlow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 days | **Every 5 days** |
| Size | 7 MB | 11 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [雨 李](https://appshunter.io/developer/1619366507) | [浩铭 顾](https://appshunter.io/developer/1873844063) |

## What reviewers say

### 瘦着呢

[App page](https://appshunter.io/ios/app/id6758323337)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 瘦着呢全能版 · 月度 | $1.99 | per month |
| 瘦着呢全能版 · 年度 | $12.99 | per year |
| 瘦着呢全能版 · 月度 | $7.99 | one-time |


### FastFlow

[App page](https://appshunter.io/ios/app/fastflow-fasting-timer/id6760942083)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FastFlow Pro Monthly | $0.99 | per month |
| FastFlow Pro Yearly | $9.99 | per year |


## Frequently asked questions

### Is 瘦着呢 free?

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

### Is FastFlow free?

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

### Do 瘦着呢 or FastFlow have ads?

FastFlow shows ads; 瘦着呢 does not.

### Which is updated more often, 瘦着呢 or FastFlow?

瘦着呢 ships an update every 8 days, and FastFlow every 5 days. Most recently, 瘦着呢 was updated on October 7, 2026 and FastFlow on October 3, 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.*