Features

Features

A practical tour of everything Lattix does and how to use it. For how the security features work, see Cryptography and Security & Trust Model.

Messaging & files

• Text messages — type and press Enter (Shift+Enter for a newline). Every message is end-to-end encrypted and signed.
• Encrypted files — click the 📎 button. The file is encrypted in your browser and uploaded as an opaque blob (default max 50 MB, configurable via LATTIX_MAX_FILE_MB). Recipients download and decrypt it locally.
• Delivery — messages arrive in real time over WebSocket when the recipient is online, and are queued on the server for delivery when they next connect.
• Authenticity — a 🔒 next to a message means its signature verified; a ⚠ means it failed and the content should not be trusted.
• Self-history — messages are also wrapped for you, so you can read your own sent history on any device that holds your vault.

Group chats

Create a group for a family or a team. Click 👥 New group, give it a name and optional emoji icon, and add members.

• Messages and files are E2E encrypted: the content key is wrapped for every member, so the relay still only sees ciphertext.
• Signatures are bound to the group, so a signed envelope can't be replayed into another conversation.
• Group info (the header menu) shows members. The owner can add or remove members; any member can leave.
• New members can't read history from before they joined (it was never wrapped for them).

Disappearing messages

Open a conversation's header menu → Disappearing messages and pick a timer (Off, 30 s, 5 min, 1 hour, 1 day, 1 week). New messages you send carry that lifetime; they're removed from the UI when it elapses and purged from the server by a background sweep, so they don't reappear on reload.

Blocking users

Header menu → Block user. Blocked users are hidden from your contact list and their incoming messages are ignored. Manage the block list in Settings → Blocked users. Blocking is enforced on your device.

Safety-code verification

Header Verify button (or Settings for your own code). Compare the code with your contact out-of-band (in person, over a call). Matching codes prove no one substituted keys in the middle. This is the core anti-MITM defense.

QR code / share link

Click the 🔗 button to open Share my link. It shows a scannable QR code (generated fully offline — no CDN) and a copyable URL of the form https://your-server/#add=<username>&fp=<fingerprint>. When someone opens that link in their Lattix, it opens a conversation with you, pre-loaded for safety-code verification.

Profile images

Settings → Profile → Upload image. The picture is downscaled on-device and shown across the UI so contacts can recognize you.

Themes & chat colors

Settings → Theme: Light, Dark, Monokai, and a dark Kali Linux theme (with the Kali dragon embedded). Settings → Chat color: recolor your own chat bubbles — red, green, blue, or pink. Both preferences persist locally.

Notifications

Settings → Notifications:

• Message tones — short WebAudio blips on send/receive (no audio files).
• Desktop alerts — optional browser notifications for incoming messages while the app is in the background.

Lattix deliberately has no SMS / phone-number notifications — that would require storing phone numbers and leaking metadata, breaking the zero-knowledge model.

Data: export, backup, restore, delete

• Export chat history (JSON) — a machine-readable, plaintext export of your decrypted conversations (your data, on your device).
• Encrypted backup — a password-sealed backup file (PBKDF2 + AES-256-GCM) of your chats and settings. Useless to anyone without the password.
• Restore backup — import an encrypted backup with its password.
• Export vault — save your encrypted .vault.json identity to move to another device (import it from the welcome screen).
• Delete application data — wipes this device's keys, chats, and settings and deletes your server account, resetting Lattix to a fresh install. Irreversible.

Cross-platform

• Web app served by the relay.
• Chrome extension (same client, configurable server URL).
• Desktop installers for Windows, macOS, and Linux.

See Desktop Apps & Extension.