Speak freely.
Protect the future.
Aira is a decentralized messenger with hybrid post-quantum cryptography. No servers, no phone numbers, no compromises.
Superpowers
Every detail designed to protect your freedom to communicate
Quantum-resistant encryption
Hybrid ML-KEM-768 + X25519 cryptography. Both algorithms must be broken simultaneously — protection against quantum computers today.
Genuine P2P
No servers, no accounts, no phone numbers. Every user is a network node. Messages travel directly over QUIC.
Invisible metadata
Pairwise pseudonyms for each contact. Even the relay doesn't know who you talk to. Padding on all packets hides message sizes.
Works everywhere
REALITY camouflage, obfs4, Tor, CDN fallback. Pluggable transports defeat DPI even in the most censored regions.
A full messenger
Reactions, replies, editing, disappearing messages, file transfers, groups up to 100 members, bots — all encrypted.
Multi-platform
CLI, desktop (Linux/macOS/Windows), Android. Up to 5 linked devices with sync through a seed phrase.
Under the hood
100% Rust. Zero unsafe code in the cryptographic core. Every key is isolated and zeroized after use.
Cryptography
Key agreement
X25519 + ML-KEM-768
Hybrid KEM, FIPS 203
Signatures
ML-DSA-65
FIPS 204, post-quantum
Encryption
ChaCha20-Poly1305
256 bit, AEAD
Hashing
BLAKE3
KDF + MAC, no length-extension
Key stretching
Argon2id
256 MB / 64 MB (desktop/mobile)
Forward secrecy
Triple Ratchet + SPQR
PQ refresh every ~50 messages
Defense
DPI bypass
5 levels
Direct → obfs4 → CPS → REALITY → Tor
Metadata
Pairwise pseudonyms
Relay sees no social graph
Deniability
Symmetric MACs
Impossible to prove authorship
Anti-spam
Proof-of-Work
20 bits for strangers
Padding
256–4096 bytes
Hides real message size
Recovery
24 BIP-39 words
Seed phrase, deterministic derivation
Why not Signal / Session / SimpleX?
vs Signal
Signal uses servers, requires a phone number, and doesn't have post-quantum protection on every message. Aira is P2P + SPQR ratchet.
vs Session
Session uses onion routing through Oxen servers. Aira is direct P2P without intermediate servers and with full PQ encryption.
vs SimpleX
SimpleX relies on relay servers for delivery. Aira works directly, and relay is only a fallback for NAT traversal.
Download Aira
v0.3.5 — Open source. Free forever.
Linux x86_64
CLI + Daemon + GUI. tar.gz archive.
macOS Apple Silicon
CLI + Daemon + GUI for Apple M1/M2/M3/M4.
macOS Intel
CLI + Daemon + GUI for Intel Macs.
Windows x86_64
CLI + Daemon + GUI. zip archive.
Android
Jetpack Compose + Rust core via UniFFI. APK.
9.5 MB
Install via Cargo: