# 证件水印 vs SlimPic

The clearest difference is price: SlimPic at Free against 证件水印's $1.99. SlimPic also leads on update cadence (weekly vs every 14 months). 证件水印's advantage is in-app purchases (none vs 2) and iOS requirement (14.0 vs 16.6). On ads and device support there is nothing between them.

SlimPic is free to download; 证件水印 costs $1.99 up front. SlimPic sells 2 in-app purchases, starting at $2.99 per month. 证件水印 asks for nothing beyond the download.

证件水印 ships an update every 14 months, SlimPic weekly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 证件水印 | SlimPic |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Weekly** |
| Monetization | Paid | — |
| Size | 2 MB | 8 MB |
| Requires iOS | **14.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [阳理 江](https://appshunter.io/developer/1645314423) | [亚龙 范](https://appshunter.io/developer/1896768551) |

## 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


### SlimPic

[App page](https://appshunter.io/ios/app/slimpic/id6771250291)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $2.99 | per month |
| Pro Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is 证件水印 free?

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

### Is SlimPic free?

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

### Do 证件水印 or SlimPic have ads?

Neither 证件水印 nor SlimPic shows ads.

### Which is updated more often, 证件水印 or SlimPic?

证件水印 ships an update every 14 months, and SlimPic weekly. Most recently, 证件水印 was updated on October 27, 2026 and SlimPic on October 24, 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.*