Dollar vs WaterTesting
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dollar
Read full descriptionHide full description
一款简洁灵便的汇率查看工具
WaterTesting
Read full descriptionHide full description
水质检测工具，可检测pH等
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Dollar | WaterTesting |
|---|---|---|
| Price | $0.99 | Free — better |
| Update frequency | Every 4 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, Apple Watch | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 16 MB |
| Age rating | 4+ | 17+ |
| Developer | 辉 周 | Shanghai Ruosull Technology Co., Ltd |
In-app purchases
Dollar
No in-app purchases
WaterTesting
No in-app purchases
