# 证件水印 vs Signed Base Converter

The clearest difference is price: Signed Base Converter at Free against 证件水印's $1.99. Signed Base Converter also leads on update cadence (fortnightly vs every 14 months). 证件水印's advantage is ads (none vs shown) and iOS requirement (14.0 vs 17.0). On in-app purchases and device support there is nothing between them.

Signed Base Converter 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, Signed Base Converter fortnightly. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | 证件水印 | Signed Base Converter |
| --- | --- | --- |
| 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** | Yes |
| Update frequency | Every 14 months | **Fortnightly** |
| Monetization | Paid | — |
| Size | 2 MB | 10 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [阳理 江](https://appshunter.io/developer/1645314423) | [洋 刘](https://appshunter.io/developer/6775317751) |

## 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


### Signed Base Converter

[App page](https://appshunter.io/ios/app/signed-base-converter/id6779268811)

**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 Signed Base Converter free?

Signed Base Converter is free to download, with no in-app purchases.

### Do 证件水印 or Signed Base Converter have ads?

Signed Base Converter shows ads; 证件水印 does not.

### Which is updated more often, 证件水印 or Signed Base Converter?

证件水印 ships an update every 14 months, and Signed Base Converter fortnightly. Most recently, 证件水印 was updated on October 30, 2026 and Signed Base Converter on October 25, 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.*