# Docmark vs 数数日子

The clearest difference is in-app purchases: 数数日子 at none against Docmark's 1. 数数日子 also leads on update cadence (daily vs monthly). Docmark's advantage is iOS requirement (13.0 vs 15.6). On price, ads and device support there is nothing between them.

Both are free to download. Docmark sells 1 one-off in-app purchase. 数数日子 asks for nothing beyond the download.

Docmark ships an update monthly, 数数日子 daily. Both last shipped on October 30, 2026.

## The numbers

| Metric | Docmark | 数数日子 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Daily** |
| Monetization | Free with in-app purchases | — |
| Size | 46 MB | 3 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CometDust Technology (Guangzhou) Co., Ltd](https://appshunter.io/developer/1763733479) | [莹 李](https://appshunter.io/developer/1803006031) |

## What reviewers say

### Docmark

[App page](https://appshunter.io/ios/app/docmark/id6711330172)

This app helps you manage and secure your credentials with custom watermarks. It prioritizes privacy with offline processing and optional iCloud synchronization. Organize, categorize, and batch edit your documents for enhanced security.

**Highlights:** Offline credential processing, Customizable watermarks, Batch editing and sorting, Local and iCloud storage, Organize and categorize credentials

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $2.99 | one-time |


### 数数日子

[App page](https://appshunter.io/ios/app/id6744024477)

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

**In-app purchases:** none


## Frequently asked questions

### Is Docmark free?

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

### Is 数数日子 free?

数数日子 is free to download, with no in-app purchases.

### Do Docmark or 数数日子 have ads?

Neither Docmark nor 数数日子 shows ads.

### Which is updated more often, Docmark or 数数日子?

Docmark ships an update monthly, and 数数日子 daily. Most recently, Docmark was updated on October 30, 2026 and 数数日子 on October 30, 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.*