计算器 vs Tutu Watermark
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
计算器
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【功能】 1.基本计算器，支持基本的计算 2.汇率换算，支持多达25种货币的换算，实时输入，换算出你想要的货币 3.简洁的界面，省心省事 【联系我们】 邮箱：liu20230501@163.com
Tutu Watermark
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The functions of adding watermarks to images are as follows: -Custom watermark text -Definition of watermark color -Custom Transparency of Watermark Text -Custom watermark text angle -Custom watermark spacing -Custom watermark line height
Screenshots
Verdict
The clearest difference is in-app purchases: 计算器 at none against Tutu Watermark's 1. Tutu Watermark's advantage is update cadence (every 3 weeks vs every 32 months). On price, ads, device support and iOS requirement 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
Both are free to download. Tutu Watermark sells 1 one-off in-app purchase. 计算器 asks for nothing beyond the download.
计算器 ships an update every 32 months, Tutu Watermark every 3 weeks. The most recent releases landed on August 15, 2026 and September 11, 2026 respectively.
| Parameter | 计算器 | Tutu Watermark |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 32 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 15 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | 德蔚 胡 | 单 安 |
In-app purchases
计算器
No in-app purchases
Tutu Watermark
- Permanent card$3.99
