Privacy-First
E2EE Messenger
Arc protects not just message content, but also who sent it. End-to-end encryption with post-quantum cryptography, offline Mesh communication, and disappearing messages β security for everyone, free of charge.
Download on the App Store
GET IT ON Google PlayValue
Live your own story
Mission
Ignite the Fire
Vision
BE A GAME CHANGER
As a Startup
The best way to predict the future is to invent it
No Internet? No Common Language?
Arc Keeps You Connected.
Arc breaks down three barriers to human connection β network outages, language barriers, and surveillance threats. With world-class E2EE, offline Mesh networking, and the AI character Rosetta powered by DeepMind's Gemma 3n, Arc turns every 'disconnect' into a connection. Defense Tech Γ Disaster Tech Γ Global Communication β one app to connect the world.
Join us in shaping the future of communication.
Post-quantum E2EE (PQXDH + ML-KEM-1024), Sealed Sender anonymity, AEGIS digital signatures, and IGF (Ignite the Fire) β security engineered to withstand nation-state level threats. When you're online, Arc provides world-class protection.
BLE Mesh Network enables device-to-device communication without any internet or cellular infrastructure. When everything goes down, Arc keeps you connected. Bridgefy SDK transport encryption protects all Mesh communication, with the BLE range limitation (10-30m) providing an additional physical security layer.
The AI character Rosetta, powered by DeepMind's Gemma 3n, breaks down language barriers offline. Download up to 5 languages and translate instantly β at airports, during travel, or in disaster scenarios. Your AI interpreter lives in your pocket, with zero data leaving your device.
Revive your beloved pet as an AI companion powered by Gemma 3n. Runs entirely on your device with full personality customization β completely private and always available, even offline.
Development Policy: Optimization
Every line of code we write follows four optimization principles.
Speed
We pursue speed in every aspect β page transitions, API responses, and screen rendering. No waiting, ever.
Lightweight
We eliminate unnecessary dependencies, minimizing app size and memory usage. Smooth performance even on constrained devices.
Stability
We aim for zero crashes with thorough error handling and testing. Reliable operation you can count on.
Secure
OWASP-compliant security measures built in as standard. Data protection is always our top priority.
Security Without Compromise
Signal Protocol as the foundation, enhanced with three proprietary security layers.
Multi-Layer E2EE
PQCPQXDH (X25519 + ML-KEM-1024) key exchange, Double Ratchet, AES-256-GCM encryption, AEGIS XEdDSA message signatures, and Client-Side Sealed Sender.
Mesh Network
BLE-based offline communication protected by Bridgefy SDK encryption. The BLE range limitation (10-30m) adds a physical security layer. No internet required β ideal for disaster scenarios and remote areas.
IGF (Ignite the Fire)
Our proprietary timed-deletion system. Messages are completely erased from all devices and servers β 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.
AEGIS Signatures
XEdDSA per-message digital signatures via libsignal prevent impersonation and tampering. AEGIS (Arc Enhanced Guard & Integrity System) provides cryptographic non-repudiation on every message.
Sealed Sender
Client-side sender anonymization. Even the server cannot see who sent a message. Ephemeral X25519 key per message + HKDF-SHA256.
Beyond Signal Protocol
Arc builds on Signal Protocol with three proprietary security layers that competitors don't have.
| Feature | Signal / WhatsApp | Arc V2 |
|---|---|---|
| Key Design | EdβX conversion | Complete separation |
| Message Signatures | None (DH only) | AEGIS XEdDSA |
| Sealed Sender | Server-side | Client-side |
| Offline E2EE | Not supported | BLE Mesh (Bridgefy SDK) |
| Multi-Device | Primary/Linked | Independent key sets + Key Sync |
| Post-Quantum | PQXDH (Signal only) | PQXDH (X25519 + ML-KEM-1024) |
| Device List | No signature | Ed25519 signed |
| Device Key Transfer | Via Primary | QR + X25519 ECDH + AES-256-GCM |
Credentials & Recognition
Recognized by industry leaders for innovation in privacy and security.
Google APAC GenAI Academy β
Selected for Google's Asia-Pacific AI development program
J Star X Program β
Japanese startup acceleration program participant
Flutter Showcase β
Featured on Flutter's official showcase (flutter.dev/showcase)
Firebase Tech Blog β
Published on Firebase Developers Medium publication
Plans for Everyone
Full E2EE on every plan. Security is never behind a paywall.
Essential
Free
Free messaging with E2EE. Unlock features with ads
1 device
Premium
$8/mo
No mandatory ads + extended IGF
3 devices
Intelligence
$25/mo
Instant server cleanup
3 devices
Ready for Private Communication?
Arc is available on iOS, Android, macOS, and Web (PWA). Start messaging securely today.