# 证件水印 vs 私语输入法

The clearest difference is rating: 证件水印 at 5.0 against 私语输入法's 3.3. 证件水印 also leads on review sentiment (92% vs 83%) and ratings volume (12 vs 4). 私语输入法's advantage is update cadence (monthly vs every 14 months) and price ($0.99 vs $1.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

证件水印 costs $1.99 and 私语输入法 $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

证件水印 holds the better App Store score, 5.0 against 3.3. Both are backed by a comparable volume of ratings — 12 and 4 respectively. Written reviews point the same way: 92% of 证件水印's written reviews are positive against 83% of 私语输入法's.

证件水印 ships an update every 14 months, 私语输入法 monthly. The most recent releases landed on October 30, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | 证件水印 | 私语输入法 |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| Rating | **[5.0 (12 ratings)](https://appshunter.io/ios/app/id1582930176/reviews)** | [3.3 (4 ratings)](https://appshunter.io/ios/app/id6446231799/reviews) |
| Number of ratings | **12** | 4 |
| Positive reviews | **92.0% of reviews** | 82.6% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Monthly** |
| Monetization | Paid | Paid |
| Size | 2 MB | 63 MB |
| Requires iOS | **14.0** | 17.0.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [阳理 江](https://appshunter.io/developer/1645314423) | [思语 明](https://appshunter.io/developer/1522214627) |

## 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


### 私语输入法

[App page](https://appshunter.io/ios/app/id6446231799)

This keyboard app offers advanced quantum encryption for your messages, images, and files, ensuring your private data remains secure. It features multiple input methods and encryption modes for private chats and group discussions, all without internet access or AI processing.

**Highlights:** Quantum encryption for messages, images, and files, Offline operation, no internet required, No ads, no AI, no data upload, Standard and private chat encryption modes, Multiple input methods (full Pinyin, 9-key, dual-pin), Customizable dual-pin layouts

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo 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 私语输入法 free?

私语输入法 costs $0.99, with no in-app purchases.

### Which has better reviews, 证件水印 or 私语输入法?

证件水印 is rated higher. 证件水印 averages 5.0 out of 5 from 12 ratings, while 私语输入法 averages 3.3 from 4 ratings.

### Do 证件水印 or 私语输入法 have ads?

Neither 证件水印 nor 私语输入法 shows ads.

### Which is updated more often, 证件水印 or 私语输入法?

证件水印 ships an update every 14 months, and 私语输入法 monthly. Most recently, 证件水印 was updated on October 30, 2026 and 私语输入法 on November 3, 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.*