Live your own story
Privacy-First E2EE Messenger with Post-Quantum Cryptography & Offline Mesh
Download on the App Store
GET IT ON Google Play
20 languages, worldwide.
BUILT FOR THE WORLD, FROM JAPAN.
Product Identity
Privacy First
E2EE is free for everyone. No backdoors. No metadata harvesting. Client-side Sealed Sender hides even the sender from our servers.
Offline Capable
Built in-house, with no third-party SDK dependency. Every Mesh message is sealed with an authenticated, stateless X25519 + AES-256-GCM scheme, so it decrypts on its own even if earlier packets are lost. Essential for disaster scenarios and remote areas.
AI Characters & On-Device AI
6 cloud AI characters plus Gemma-powered on-device AI. Rosetta automatic translation stays on your phone. Coaching AI differs by plan: Premium, free access, and trials use Gemini 3.5 Flash-Lite; Intelligence uses Gemini 3.6 Flash, after per-message consent.
When Messages Vanish, Beautifully
Goodbye, with style.
When an IGF (Instant Gone Forever) message reaches its expiry, it doesn't just disappear — it dissolves with a short themed animation in your chosen color, with symbols that match each theme's spirit.
48 Variations
Four motion patterns (bloom / burst / spiral / fade) combined with twelve theme symbol sets give you 48 unique disappearance moments at random.
Theme-Specific Symbols
Each theme has its own glyph palette: clouds and stars for Sky, wine glasses and barrels for Cave, code rain for Matrix, and so on. Every disappearance feels personal.
Right Before Expiry
The animation fires 1.2 seconds before the message vanishes — long enough to notice, short enough to feel like a graceful exit.
Reactions That Come Alive
Tap. Surprise. Repeat.
Some reaction icons unlock special animations when sent. Even the same icon can play multiple random patterns — a small delight every time you react.
Flower Reactions
20 floral icons trigger 6 random animation patterns: bloom, burst, petal storm, spiral, float-up, and fireworks.
30% Surprise
Animations trigger 30% of the time — frequent enough to delight, rare enough to feel special.
Security Without Compromise
Signal Protocol as the foundation, extended with capabilities beyond it — offline BLE Mesh, IGF ephemeral messaging, and independent per-device keys.
Multi-Layer E2EE
PQCPQXDH (X25519 + ML-KEM-1024) key exchange, Double Ratchet, AES-256-GCM encryption, XEdDSA signatures (libsignal), and Client-Side Sealed Sender.
Mesh Network
BLE-based offline communication, engineered in-house on stateless X25519 + AES-256-GCM encryption — no third-party SDK, no session state to lose. No internet required — built for disaster scenarios and remote areas.
IGF (Ignite the Fire)
Our proprietary timed-deletion system. Messages are completely erased from all devices and servers — gone forever.
Key Sync
Securely transfer encryption keys between devices using QR codes. X25519 ECDH + AES-256-GCM encrypted transfer with 5-minute session TTL.
Sealed Sender
Client-side sender anonymization. Even the server cannot see who sent a message. Ephemeral X25519 key per message + HKDF-SHA256.
How Arc Compares
Every messaging app makes trade-offs. Arc doesn't.
vs Signal
Good — but Arc goes further
Phone is the master device
✓ All devices equal — no primary required
Limited cloud backup only (PIN-required)
✓ Full encrypted backup, multi-device restore
History grows forever
✓ Auto-purged by IGF
No offline messaging
✓ BLE Mesh — works without internet
vs WhatsApp
Familiar — but Meta owns your metadata
Metadata collected by Meta
✓ Zero metadata logging
Backup unencrypted by default
✓ E2EE backup, always
Backup unencrypted by default
✓ True E2EE backup, always enabled
No post-quantum protection
✓ ML-KEM-1024 (PQXDH)
vs Telegram
Convenient — but not truly private
E2EE only in Secret Chat
✓ All chats E2EE by default
Server can read regular messages
✓ Zero server content access
Messages stored on Telegram servers
✓ User-controlled encrypted sync
No post-quantum protection
✓ ML-KEM-1024 (PQXDH)
AI Characters & On-Device AI
Sommelier, healthcare, fortune, fitness, and more — meet Arc's cloud AI characters plus on-device AI powered by Gemma.
Explore Arc
Tips & FAQs
Everything you need to know about Arc's features and security.
Reaction Icons
100 unique reactions including floral and emoji collections.
AI Characters
Cloud AI characters and on-device AI — discover the full lineup.
Security
Arc Protocol: Signal Protocol (libsignal) as the foundation, with PQXDH (ML-KEM-1024) post-quantum cryptography, XEdDSA signatures, and client-side Sealed Sender.
Key Sync
Transfer your encryption keys to a new device using QR codes. X25519 ECDH key exchange + AES-256-GCM encrypted transfer.
Pricing
Full E2EE on every plan. Security is never behind a paywall.
Tracker
Smart habit and health tracking with E2EE protection.