How to Build Your Own Threema
Replace Threema with a custom build. Secure Communication For Individuals and Companies
Build Difficulty: 5/5
Build a working replacement in a weekend with AI tools
Estimated Timeline
Based on 36 features at Weekend Project difficulty, expect about One weekend with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Real-time messaging and live updates
Key Features to Replicate
Top features across 8 categories. See all 36 features
Security(8 features)
Verify contacts using QR code to protect against man-in-the-middle attacks
Block app access remotely to protect chat content when smartphone is lost or compromised
All messages, calls, and files are protected with strong cryptography based on open-source encryption technology
Transparent code with regular external security audits demonstrating high security standards
Prevents retrospective decryption even in the event of key compromise for reliable protection of confidential communication
+3 more in this category
Collaboration(7 features)
Send messages to multiple recipients at once without group functionality
Send any type of file with end-to-end encryption
Send messages to multiple recipients with strictly decentralized group management where only group members know membership
Share location information securely within encrypted conversations
Share images, videos, and other media with end-to-end encryption
+2 more in this category
Messaging(4 features)
React to chat messages with emojis without triggering push notifications on recipient's end
Add typographical emphasis with bold, italic, and strikethrough formatting
Send and receive text messages with ability to edit and delete after sending
Send audio messages as a quick alternative to typing
Client(3 features)
Secure desktop application for chatting with full access to chat history, contacts, and media files
Use Threema on tablets and devices without a SIM card
Browser-based client for secure chatting with full functionality equivalent to mobile app
Communication(3 features)
Invite group members to join end-to-end encrypted audio/video group calls with single tap
Place encrypted video calls with brilliant video quality and tap-proof encryption
Place encrypted calls without revealing phone number with crystal-clear voice quality
Customization(2 features)
Choose between light or dark theme for the user interface
Customize app design with flexible app name, individual logo, and color scheme to match corporate branding
Integration(2 features)
Optional contact synchronization without requiring address-book access
Enable secure communication with external contacts via QR code without complicated registration
Privacy(2 features)
No requirement for phone number or email address; uses unique Threema ID for confidential communication without revealing identity
Messages disappear from servers after delivery; contact lists remain on user device to minimize digital traces
Cost Calculator
Pricing data not available for Threema. Check their website for current pricing.