# Hidden Mark:Transmission Tools — Secure&Creative Hidden Tools

> Secure&Creative Hidden Tools (iPhone/iPad app by 鸿斌 唐.)

- Source: https://appshunter.io/ios/app/hidden-marktransmission-tools/id6762620428 (this page in markdown: same URL + `.md`)
- Developer: [鸿斌 唐](https://appshunter.io/developer/1894765402)
- Category: Utilities, Entertainment
- Price: $1.99 with in-app purchases
- Age rating: 9+
- Requires: iOS 15.0 · 1 MB
- Languages: American English, Arabic, French (France), German (Germany), Hindi, Chinese (Simplified, China), European Spanish, Thai
- Released: 2026-04-22
- Data updated: 2026-07-03
- User reviews in markdown: https://appshunter.io/ios/app/hidden-marktransmission-tools/id6762620428/reviews.md

## What is Hidden Mark?

HiddenMark is a creative privacy tool designed for iOS users. With the core concept of "Hidden Delivery, Private Enjoyment", it integrates three powerful features: Sound Mark, Image Hidden Text, and Invisible QR Code.
All functions run 100% locally on your device — no data uploads, no network, no ads. We protect every private thought and secret you want to keep safe.
Whether you’re sharing whispers with your partner, hiding surprises in photos, creating fun secret codes, or storing confidential information, HiddenMark turns text into an invisible carrier — only recognizable by this app, completely undetectable to others.
Compatible with iOS 15.0+, supports English/Chinese auto-switch. Simple interface, zero learning curve. Unlock all features with an affordable subscription.
Core Features
Sound Mark: Turn text into inaudible sound waves, only decodable by HiddenMark. Save and share via AirDrop.
Image Hidden Text: Embed text invisibly into images with zero visual changes. Perfect for secret messages and privacy storage.
Invisible QR Code: Generate nearly invisible QR codes, scannable only by this app for private and fun sharing.
Privacy Protection
100% Local Processing: No cloud, no data leakage.
Minimal Permissions: Camera/photo access only when needed.
Zero Data Collection: No login, no tracking, no personal info gathered.
User Experience
Single-page design, one-tap feature switching.
Real-time feedback and clear error prompts.
Native iOS saving & sharing, no ads or redirects.
Who Is It For?
Couples |  Gen Z & Students |  Privacy-Conscious Users | Global Users
Why HiddenMark?
All-in-one hidden messaging tool.
True local privacy, no cloud risks.
HiddenMark is more than a privacy app — it’s a creative way to connect emotionally.
Download now and turn ordinary text into exclusive, private memories.
Terms of Use: https://hiddenmark.cc/terms-of-service.html
Privacy Policy: https://hiddenmark.cc/privacy-policy.html

## Pricing and in-app purchases

Base price: $1.99.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Weekly Premium | $1.99 | per 7 days |
| Monthly Premium | $2.99 | per month |
| Yearly Premium | $9.99 | per year |



## Version history (last 2 releases)

### 1.0.1 — 2026-04-24

1、Added multi-language support
2、Fixed some minor bugs

### 1.0 — 2026-04-23

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-03.*