What is Tuijo?
Tuijo is a completely private and secure messaging app, designed exclusively for couples. Thanks to advanced end-to-end encryption (RSA-2048 + AES-256), only you and your partner can read your messages. Not even we can access them!
✨ Main Features
💬 Secure Chat
End-to-end encrypted messages, read receipts, typing indicators, and much more.
📍 Encrypted Location
Share your real-time GPS location with AES-256 encrypted coordinates. Interactive navigation with compass.
📞 Voice Calls
Peer-to-peer audio calls via WebRTC. Native CallKit on iOS, incoming call notifications on Android.
📎 Protected Attachments
Send photos, videos, and documents fully encrypted with integrated viewer.
📅 TODOs & Reminders
Create shared reminders with automatic notifications and integrated calendar in chat.
🌍 Multilingual
Fully localized interface in 4 languages: Italian, English, Spanish, and Catalan.
💑 Couple Selfie
A shared profile picture that automatically syncs between your devices.
🖼️ Media Gallery
Photos, links, and documents organized in tabs with Pinterest-style grid for links.
🔗 Link Preview
Paste a link and the app automatically extracts title, description, and preview image.
📤 External Sharing
Share photos, videos, documents, and links directly from other apps via Share Extension.
🔐 Maximum Security
Your privacy is our priority. We use double encryption with RSA-2048 for key exchange and AES-256 for messages. Each message has a unique key and nobody, not even the server, can read your content.
🚀 How Does It Work?
1. Initial Pairing (QR Code)
- Device A generates its cryptographic keys and shows a QR code
- Device B scans the QR code and imports A's public key
- Device B shows its QR code with its own public key
- Device A scans B's QR code and completes the pairing
- Both devices are now securely connected! 🎉
2. Sending Encrypted Messages
- Write your message in the app
- The app generates a unique random AES-256 key for that message
- The message is encrypted with AES-256
- The AES key is encrypted TWICE:
- Once with your public key (for you)
- Once with your partner's public key (for them)
- The encrypted message and keys are saved to the cloud
- Only you and your partner can decrypt and read the message!
3. TODOs with Automatic Reminders
- Create a TODO with date and time from the app
- The app automatically sends a scheduled reminder
- 1 hour before the event, both of you will receive a notification
- Complete the TODO with a simple long press!
4. Real-Time Location Sharing
- Tap the 📍 button in chat to start
- Choose the duration: 1 hour or 8 hours of sharing
- Your partner receives the message and sees your live location
- Interactive radar screen with arrow pointing towards you
- Real-time distance (meters/km) and compass direction
- Session expires automatically, no data remains on servers!
💪 Why Choose Tuijo?
- Total Privacy: End-to-end encryption with zero-knowledge architecture
- Find Your Partner: GPS location sharing with real-time navigation
- Fast: Local cache for instant loading (< 100ms)
- Complete: Chat, attachments, TODOs, calendar, location, and notifications
- Modern: Clean design with teal theme and smooth animations
- Reliable: Serverless backend on Firebase, always available
- Just for You Two: Designed specifically for couples, not for groups
🎯 Current Version: 1.24.0
What's new in February 2026:
• 📞 Peer-to-peer voice calls via WebRTC with native CallKit
• 🔐 GPS coordinates encrypted with per-session AES-256 in location sharing
• 📍 Initial coordinates in encrypted message for instant navigation
• 🗺️ Full-screen location setup page with live/static mode
• 🔒 Zero plaintext GPS data on server
🛠️ Technology
📱 Availability
Tuijo is available for iOS and Android. The app is designed to work perfectly on modern smartphones with an interface optimized for mobile devices.