DefenseTech
Privacy-First E2EE Messenger
Arc protects not just what you say, but who said it. Post-quantum end-to-end encryption, offline Mesh communication, and disappearing messages — engineered to defense-grade standards, free for everyone.
Download on the App Store
GET IT ON Google PlayThree Pillars. One Mission: A Free, Global Communication Layer.
Arc's technical foundation — end-to-end encryption, post-quantum cryptography, and offline mesh networking — engineered together as one system, not bolted on.
E2EE
End-to-End Encryption (E2EE)
Signal Protocol · Double Ratchet · Sender Keys
Every message is encrypted on your device and decrypted only on the recipient's. Not even Atlas Associates can read your conversations.
PQC
Post-Quantum Cryptography (PQC)
PQXDH · ML-KEM-1024
Arc pairs classical X25519 with NIST-standardized ML-KEM-1024 key encapsulation, so today's messages stay safe even against tomorrow's quantum computers.
MESH
Mesh Network
Offline BLE Mesh
When cell networks and the internet are down — during disasters, protests, or in remote areas — Arc keeps working device-to-device over Bluetooth.
Value
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
Drag to rotate
No Internet? No Common Language?
Arc Keeps You Connected.
Arc breaks down three barriers to human connection — network outages, language barriers, and surveillance threats. With world-class E2EE, offline Mesh networking, and the AI character Rosetta powered by Google's TranslateGemma 4B IT, Arc turns every 'disconnect' into a connection. Defense Tech × Disaster Tech × Global Communication — one app to connect the world.
Join us in shaping the future of communication.
Post-quantum E2EE (PQXDH + ML-KEM-1024), Sealed Sender anonymity, and IGF (Ignite the Fire) — 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. Every message is protected by an authenticated, stateless X25519 + AES-256-GCM encryption scheme built entirely in-house — engineered so a single lost or out-of-order packet during a disaster never breaks the channel.
Rosetta uses Google's TranslateGemma 4B IT INT8 model for offline incoming and outgoing translation. TranslateGemma performs the first coaching pass on-device. After explicit consent, Premium, free access, and trials use Gemini 3.5 Flash-Lite; Intelligence uses Gemini 3.6 Flash for the current outgoing draft.
The Optimization Standard
Every line of code we write follows four optimization principles.
Speed
We pursue speed in every aspect — 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, 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.
A Ritual You Both Choose
Encryption you both choose to honor.
- 🕯
Mutual Burn
Two candles. One flame. Both decide.
- 🔁
Gold Resend
Even unreadable moments become a ritual.
- 💌
Sealed Letter
A closed letter, opened in trust.
Beyond Signal Protocol
Arc runs the same audited engine as Signal and WhatsApp (libsignal) — then adds layers they don't offer: offline BLE mesh, tiered disappearing messages, and independent per-device keys.
| Feature | Signal / WhatsApp | Arc V2 |
|---|---|---|
| Encryption engine | libsignal (Signal Protocol) | Same — libsignal (Signal Protocol) |
| Post-quantum | PQXDH (X25519 + ML-KEM-1024) | Same — PQXDH (X25519 + ML-KEM-1024) |
| Offline E2EE | Not supported | BLE Mesh (beta) |
| Ephemeral messages | Timer-based | IGF (tiered) + Mutual Burn |
| Multi-device model | Primary / Linked | Independent key sets + Key Sync |
| Device key transfer | Via primary device | QR + X25519 ECDH + AES-256-GCM |
| Device list integrity | Server-managed | XEdDSA signed (via libsignal) |
| Message history | Grows indefinitely | Auto-limited by IGF |
Credentials & Recognition
Recognized by industry leaders for innovation in privacy and security.
Google APAC GenAI Academy ↗
Selected for Google's Asia-Pacific AI development program
J Star X Program ↗
Japanese startup acceleration program participant
Flutter Showcase ↗
Featured on Flutter's official showcase (flutter.dev/showcase)
Firebase Tech Blog ↗
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
Private by Default. Free for Everyone.
Arc is available on iOS, Android, and macOS. Download and start messaging with defense-grade encryption today.