# 随手弹幕 vs WaterTesting

The clearest difference is in-app purchases: WaterTesting at none against 随手弹幕's 1. WaterTesting also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 2 months). On price and device support there is nothing between them.

Both are free to download. 随手弹幕 sells 1 one-off in-app purchase. WaterTesting asks for nothing beyond the download.

随手弹幕 ships an update every 2 months, WaterTesting every 3 weeks. The most recent releases landed on September 5, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | 随手弹幕 | WaterTesting |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 52 MB | 16 MB |
| Requires iOS | 16.6 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [xiangshang](https://appshunter.io/developer/1145234493) | [Shanghai Ruosull Technology Co., Ltd](https://appshunter.io/developer/1735275002) |

## What reviewers say

### 随手弹幕

[App page](https://appshunter.io/ios/app/led/id1514787645)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (LifeTime) | $1.99 | one-time |


### WaterTesting

[App page](https://appshunter.io/ios/app/watertesting/id6479241037)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 随手弹幕 free?

随手弹幕 is free to download, with in-app purchases available.

### Is WaterTesting free?

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

### Do 随手弹幕 or WaterTesting have ads?

随手弹幕 shows ads; WaterTesting does not.

### Which is updated more often, 随手弹幕 or WaterTesting?

随手弹幕 ships an update every 2 months, and WaterTesting every 3 weeks. Most recently, 随手弹幕 was updated on September 5, 2026 and WaterTesting on September 12, 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.*