# 证件水印 vs 蛇类识别器

The clearest difference is price: 蛇类识别器 at Free against 证件水印's $1.99. 蛇类识别器 also leads on update cadence (every 5 days vs every 14 months). 证件水印's advantage is iOS requirement (14.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

蛇类识别器 is free to download; 证件水印 costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

证件水印 ships an update every 14 months, 蛇类识别器 every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 证件水印 | 蛇类识别器 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (12 ratings)](https://appshunter.io/ios/app/id1582930176/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 92.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 5 days** |
| Monetization | Paid | — |
| Size | 2 MB | 3 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [阳理 江](https://appshunter.io/developer/1645314423) | [雨雪 雷](https://appshunter.io/developer/1896522689) |

## What reviewers say

### 证件水印

[App page](https://appshunter.io/ios/app/id1582930176)

This utility app allows users to add text watermarks to documents and photos, protecting personal information from misuse. It supports batch processing for up to 50 images and can export in PDF or image formats, including an A4 print mode.

**Highlights:** Add text watermarks, Protect privacy information, A4 copy print mode, Export PDF or image, Batch watermark up to 50 photos, No network requests

**Features:** Vision Pro support

**In-app purchases:** none


### 蛇类识别器

[App page](https://appshunter.io/ios/app/and/id6771631711)

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

**In-app purchases:** none


## Frequently asked questions

### Is 证件水印 free?

证件水印 costs $1.99, with no in-app purchases.

### Is 蛇类识别器 free?

蛇类识别器 is free to download, with no in-app purchases.

### Do 证件水印 or 蛇类识别器 have ads?

Neither 证件水印 nor 蛇类识别器 shows ads.

### Which is updated more often, 证件水印 or 蛇类识别器?

证件水印 ships an update every 14 months, and 蛇类识别器 every 5 days. Most recently, 证件水印 was updated on November 3, 2026 and 蛇类识别器 on October 31, 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.*