# AOI vs WaterTesting

The clearest difference is update cadence: WaterTesting at every 3 weeks against AOI's every 6 months. WaterTesting also leads on device support. On price, in-app purchases and iOS requirement there is nothing between them.

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

AOI ships an update every 6 months, WaterTesting every 3 weeks. The most recent releases landed on June 21, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | AOI | WaterTesting |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/aoi/id1603547582/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | — | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 1 MB | 16 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | — | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [杰 李](https://appshunter.io/developer/1602306282) | [Shanghai Ruosull Technology Co., Ltd](https://appshunter.io/developer/1735275002) |

## What reviewers say

### AOI

[App page](https://appshunter.io/ios/app/aoi/id1603547582)

This utility app allows users to control iPhone camera modules, adjust parameters, and switch camera views. It also enables local server and client creation for interactive experiences and includes a dice game for friendly competition.

**Highlights:** iPhone camera module control, Customizable camera parameters, Local server and client setup, Interactive communication, Dice rolling mini-game

**In-app purchases:** none


### WaterTesting

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AOI free?

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

### Is WaterTesting free?

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

### Which is updated more often, AOI or WaterTesting?

AOI ships an update every 6 months, and WaterTesting every 3 weeks. Most recently, AOI was updated on June 21, 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.*