Features

Encryption and Security

End-to-end encryption: Curve25519 ECDH key agreement, HKDF-SHA256 key derivation, AES-256-GCM authenticated encryption
Trust-On-First-Use (TOFU): automatically records peer identities on first contact and alerts on key changes
Key fingerprint verification: human-readable fingerprints for out-of-band MITM detection
Encryption downgrade prevention: unencrypted messages rejected by default (configurable)
Image metadata stripping: EXIF, GPS, and all metadata stripped from images before transmission
Encrypted storage: chat history persisted through an injectable SecureStorageProvider (AES-256-GCM)
Relay-aware key exchange: E2E encryption works across relay hops in the mesh network
Session teardown: cryptographic material securely cleared when sessions end

Details in Security.

Rich message types: text, images, voice notes, emoji, polls, and system messages
Message reactions: quick-react with emoji on any message, synced across all peers
Polls: create polls with multiple options, optional vote-change policy, live vote counts
Replies: reply to specific messages with preview context
@Mentions: mention peers by name with autocomplete support and notification triggers
Group and private chat: switch between group conversation and 1-on-1 private messaging
Message status tracking: sending, sent, delivered, read, and failed states

Voice and video calling: encrypted 1:1 and group calling over local and remote ConnectionPool connectivity
Call signaling over the pool: CallSignal rides the same transport as chat, so calls need no separate infrastructure
Per-call media keys: MediaEncryptionService derives call keys from the established chat keys, so media inherits the chat trust model
Ready-made call UI: ActiveCallView, IncomingCallView, CallButtonsView, and VideoTileView ship with the package

Works over ConnectionPool: peer discovery, connection management, chat routing, and call signaling handled by the transport layer
Local and remote pool support: operates across nearby mesh peers and remote ConnectionPool-backed sessions
Chat history sync: host sends encrypted history to newly joined peers (configurable)
Local notifications: background message notifications with deep link support, reply actions, and thread grouping
Notification bridge: notifications work even when the chat window is closed
Voice recording: AVFoundation-based recording with playback, seek, and progress tracking
Configurable logging: inject your own logger or use the built-in os.Logger fallback
Cross-platform: iOS and macOS from a single codebase with platform-adaptive SwiftUI views
Swift 6 strict concurrency: no data races, proper actor isolation, Sendable throughout