# Secure Watermark vs 氢云之上

The clearest difference is update cadence: 氢云之上 at every 3 days against Secure Watermark's every 2 weeks. 氢云之上 also leads on iOS requirement (10.0 vs 17.0). 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.

Secure Watermark ships an update every 2 weeks, 氢云之上 every 3 days. The most recent releases landed on June 1, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Secure Watermark | 氢云之上 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/secure-watermark/id6504274596/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Free | — |
| Size | 2 MB | 20 MB |
| Requires iOS | 17.0 | **10.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [泽海 黄](https://appshunter.io/developer/1069894245) | [Zhongshan Ruixin Electronic Technology Co.LTD](https://appshunter.io/developer/1521592955) |

## What reviewers say

### Secure Watermark

[App page](https://appshunter.io/ios/app/secure-watermark/id6504274596)

Easily protect your sensitive documents and digital creations from unauthorized use. Add custom text, image, or handwritten signature watermarks to photos, IDs, and artwork. Offers advanced customization for text and image placement, with ID mode for seamless document protection.

**Highlights:** Rich text watermarks with full customization, Image watermarks with adjustable transparency, Handwritten signature watermarks, ID mode for secure document protection, Export as image or PDF at 300 DPI, Watermark management list

**In-app purchases:** none


### 氢云之上

[App page](https://appshunter.io/ios/app/id6744127992)

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

**In-app purchases:** none


## Frequently asked questions

### Is Secure Watermark free?

Secure Watermark is free to download, with no in-app purchases.

### Is 氢云之上 free?

氢云之上 is free to download, with no in-app purchases.

### Do Secure Watermark or 氢云之上 have ads?

Neither Secure Watermark nor 氢云之上 shows ads.

### Which is updated more often, Secure Watermark or 氢云之上?

Secure Watermark ships an update every 2 weeks, and 氢云之上 every 3 days. Most recently, Secure Watermark was updated on June 1, 2026 and 氢云之上 on September 9, 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.*