Features

Core Features

Everything you need for a modern decentralized communication application

End-to-End Encryption

Every message is encrypted using ECDH key exchange. Relay nodes can forward your messages but can never read them. Cryptographic signatures verify message authenticity.

Direct & Mesh Delivery

Messages are delivered directly when your contact is nearby, or relayed through the mesh network. You always see the actual delivery method: Direct, Mesh, or Queued.

Group Chats

Create encrypted group conversations. Groups use their own key pair, and unknown senders appear anonymized until you add them as contacts ‐ encouraging real-world connections.

Relay Hub Mode

Turn your device into a mesh supernode. Hub mode forwards to 30 peers (vs 10 normal), stores 30MB of relay data, and can help relay messages to more nodes.

Postman Mode

Be like a postman and carry messages for your contacts. Doubles storage capacity to 200 messages and prioritizes delivery to your contacts' recipients. Be a human relay node.

App Lock

Protect the app with PIN, TOTP authenticator codes, or biometric unlock. Auto-lock on screen off, intruder photo capture, and screenshot blocking keep your messages safe.

Backup & Restore

Export encrypted backups protected with Argon2id + AES-256-GCM. Restore on a new device with your password and 32-character backup code. ICE contacts are automatically notified on restore.

Battery Optimized

Intelligent power management with AlarmManager-based scheduling. Wake locks reduced by 75%, running at approximately 1.2x normal battery drain with full mesh functionality.

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Groups

Group Chats

Encrypted group conversations with a unique privacy model

Room Approach Architecture

Each group has its own EC key pair shared among members. Messages are encrypted using ECDH between the sender's private key and the group's public key, ensuring only group members can read content.

Privacy-First Design

Messages from unknown contacts in a group appear as truncated IDs (e.g., "D4F2A9...F9G7B2") with an "Add to view messages" prompt. This creates a natural incentive to meet people in person before seeing their messages.

Message Sending

Group messages are delivered in the same way as normal messages. This means that messages can be sent direct if near or relay across the mesh if not. Messages may come in out of order due to the nature of how a decentralized mesh system works or may never arive at all.

Member Management

Two-tier system: Ignore (local, hide messages from specific members) and Remove (network-wide, creator only, propagated to all members for 7 days).

Group Management

You can create a group yourself, or join someone elses group. Both methods require physical proximity with other members. This is so your devices can exchange private keys. You cannot join a group remotely.

Group Limits

Groups can have a maximum of 50 members. Messages sent to groups decay over time, For the first few hours it will attempt to send messages to everyone in the group. As hours and days pass the application will lower the threshold of number of members it has delivered messages to until it considers the message as delivered. This is one of the biggest drawbacks of a decentralized messaging system, there is no server inbetween tracking who got the message and who still needs it.

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Mesh Network

Relay & Mesh Modes

Extend the network and carry messages further

Relay Hub Mode

Transform your device into a mesh network supernode that actively helps messages reach their destinations.

Peer Forwarding
Normal: 10 peers Hub: 30 peers
Relay Storage
Normal: 10 MB Hub: 30 MB
Rate Limit
Normal: 25 msg/min 100 msg/min

Overnight Relay Mode

Set your device to automatically become a relay hub during configured hours when plugged in to charge. Perfect for supporting the mesh while you sleep.

  • Auto-enables when charging during configured hours
  • Display modes: Stats / Digital Clock / Analog Clock
  • Independent light/dark theme
  • Auto-disables when you interact with the device

Postman Mode

Be a human relay node. Carry messages for your contacts by physically traveling between locations. Ideal for bridging gaps in the mesh where people are far apart.

  • Keeps messages until direct delivery to recipient
  • Doubles message capacity to 200 messages
  • Priority: Recipient > Contact > 10-peer threshold
  • Perfect for commuters, travelers, or community connectors

Network Health Monitoring

Bridgelink continuously monitors network health that measure peer count and connection staleness. Session health checks run every 90-300 seconds, with automatic teardown and rebuild if WiFi Aware enters a zombie state.