# 计算器 vs Tutu Watermark

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.

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.

## The numbers

| Metric | 计算器 | Tutu Watermark |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 3 weeks** |
| Size | 15 MB | 30 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [德蔚 胡](https://appshunter.io/developer/1685595219) | [单 安](https://appshunter.io/developer/1703734519) |

## What reviewers say

### 计算器

[App page](https://appshunter.io/ios/app/id6449093985)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Tutu Watermark

[App page](https://appshunter.io/ios/app/tutu-watermark/id6711340833)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Permanent card | $3.99 | one-time |


## Frequently asked questions

### Is 计算器 free?

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

### Is Tutu Watermark free?

Tutu Watermark is free to download, with in-app purchases available.

### Do 计算器 or Tutu Watermark have ads?

Neither 计算器 nor Tutu Watermark shows ads.

### Which is updated more often, 计算器 or Tutu Watermark?

计算器 ships an update every 32 months, and Tutu Watermark every 3 weeks. Most recently, 计算器 was updated on August 15, 2026 and Tutu Watermark on September 11, 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.*