# Dollar vs WaterTesting

The clearest difference is price: WaterTesting at Free against Dollar's $0.99. WaterTesting also leads on iOS requirement (14.0 vs 16.0). Dollar's advantage is update cadence (every 4 days vs every 3 weeks). On ads, in-app purchases and device support there is nothing between them.

WaterTesting is free to download; Dollar costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Dollar ships an update every 4 days, WaterTesting every 3 weeks. The most recent releases landed on August 24, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | Dollar | WaterTesting |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 1 MB | 16 MB |
| Requires iOS | 16.0 | **14.0** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [辉 周](https://appshunter.io/developer/1646169543) | [Shanghai Ruosull Technology Co., Ltd](https://appshunter.io/developer/1735275002) |

## What reviewers say

### Dollar

[App page](https://appshunter.io/ios/app/dollar-currency-widget/id6450919353)

**Features:** macOS Compatibility, Apple Watch app

**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 Dollar free?

Dollar costs $0.99, with no in-app purchases.

### Is WaterTesting free?

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

### Do Dollar or WaterTesting have ads?

Neither Dollar nor WaterTesting shows ads.

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

Dollar ships an update every 4 days, and WaterTesting every 3 weeks. Most recently, Dollar was updated on August 24, 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.*