FortKnoxster is a FREE app to communicate privately and securely. FortKnoxster uses only your Internet connection, NO call charges, chat and call your friends, family and colleagues from anywhere in the world for FREE.
- Chat including Group Chat
- Invite-Only Mail, Communicate securely by invitation only, no risk of privacy breaches or system hacks
- Voice & Video Calls. Call your friends, family, colleagues, partners worldwide
- Screen Share, share your screen privately
- File Share Securely & Privately including Photos, Videos & Voice Messages
- End to End Encryption on all features

FortKnoxster is simple, FREE and easy-to-use. FortKnoxster protects your online privacy by encrypting all your communication and data with NO FEES.

We offer you maximum SAFETY & PRIVACY. Secure communications are our specialty.
Our platform operates on a ZERO KNOWLEDGE principle which means complete privacy. NO ONE else has access to YOUR personal information.

FortKnoxster privacy features:
* End-to-end encrypted communication & data.
* Blockchain technology for decentralized trust of digital identities
* Decentralized cloud storage
* Self-destruct messages.
* Zero-Knowledge concept – we can never access your messages or data.
* Push notifications let you know when new messages have arrived.
* Integrated with the FortKnoxster web app – extend your security also to your PC/Mac.
* Privacy protected – your encrypted data will never be given to third parties.

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What happens in FortKnoxster stays in FortKnoxster.

What’s New

Version 1.6.1

Thanks for using FortKnoxster! We regularly update our apps to bring you new features, improved performance and security.
- New reply to chat messages and attachments feature
- New multiple group chat admins support
- New group admins can add other members and manage group
- iOS 13 mail attachments visibility fixed
- General bug fixing & performance enhancements

Ratings and Reviews

4.7 out of 5
18 Ratings

18 Ratings

imJinzo ,

Beautiful APP

Love this App beautifully put together. Privacy is key for me. I can’t wait until absolutely everyone uses this over Whatsapp!

callmenacho ,

Features seem cool but broke on iPhone XR

From what I could test, seems to have the features necessary for a messenger. But the input box in chat is at the very bottom of the screen behind where you swipe up to close. So cannot access the input or anything at the bottom.

Developer Response ,

Hi there, the issues you have experienced are already resolved in the latest version, please make sure to update.
Thank you.
FortKnoxster Team

emothious ,

This app is legit

Defiantly a use case for this app, taking everyday communication and adding military grade privacy is something we as people have longed for. Let’s see how often they update. Communication is key what’s a key without a lock?


FortKnoxster Ltd.
81.8 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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