# 水印相机 vs 图书管管

The clearest difference is update cadence: 水印相机 at every 3 weeks against 图书管管's every 2 months. 图书管管's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

水印相机 ships an update every 3 weeks, 图书管管 every 2 months. The most recent releases landed on September 19, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | 水印相机 | 图书管管 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/id6476538899/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 15 MB | 28 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenyang Yuehe Gongchuang Information Technology Co.,Ltd](https://appshunter.io/developer/1578845704) | [得星 龚](https://appshunter.io/developer/1713826573) |

## What reviewers say

### 水印相机

[App page](https://appshunter.io/ios/app/id6476538899)

Easily add various watermarks to your photos for work, study, or personal use. Choose from numerous templates and customize your own watermarks with date, time, location, and more. Save both original and watermarked images simultaneously.

**Highlights:** Add date, time, weather, location, and altitude watermarks, Professional watermark templates for attendance, business cards, and construction, Customizable watermark content, Automatic orientation adaptation, Save original and watermarked photos simultaneously

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

**In-app purchases:** none


### 图书管管

[App page](https://appshunter.io/ios/app/id6483943101)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 水印相机 free?

水印相机 is free to download, with no in-app purchases.

### Is 图书管管 free?

图书管管 is free to download, with no in-app purchases.

### Do 水印相机 or 图书管管 have ads?

Neither 水印相机 nor 图书管管 shows ads.

### Which is updated more often, 水印相机 or 图书管管?

水印相机 ships an update every 3 weeks, and 图书管管 every 2 months. Most recently, 水印相机 was updated on September 19, 2026 and 图书管管 on September 23, 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.*