DefenseTech for Cybersecurity,Post-Quantum,Disaster & Crisis
Arc is designed to create a reason to switch—not to hide behind neutral language. Its differentiation is the combination of post-quantum E2EE, deliberate message retirement, low-bandwidth operation, and offline disaster communication.
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GET IT ON Google PlayThree Pillars. One Mission: A Free, Global Communication Layer.
Arc is designed to create a reason to switch—not to hide behind neutral language. Its differentiation is the combination of post-quantum E2EE, deliberate message retirement, low-bandwidth operation, and offline disaster communication.
E2EE
End-to-End Encryption (E2EE)
Signal Protocol · Double Ratchet
PQXDH, Double Ratchet, Sender Keys, and explicit downgrade prevention.
PQC
Post-Quantum Cryptography (PQC)
ML-KEM-1024 · PQXDH
Post-quantum cryptography uses algorithms designed to resist known attacks from sufficiently capable quantum computers when correctly implemented. Arc's target is standardized ML-KEM-1024 in a hybrid PQXDH construction, retaining classical protection while adding a post-quantum component. This reduces harvest-now-decrypt-later risk; it is not an absolute guarantee against every implementation, endpoint, or future cryptanalytic failure.
MESH
Mesh Network
BLE · Direct · Store-and-Forward
Low-bandwidth voice evaluation and direct disaster communication with explicit security modes.
A Bridge Between People & Fortress of Defense: Four Defense-Grade Optimizations
Not built for aggression, but as a Fortress of Defense and a Bridge Between People to protect free conversation and peace of mind worldwide. This North Star is the sole defining reason why defense-grade resilience (Anti-DoS) and radical optimizations are indispensable.
Stability (Anti-DoS & Crisis Resilience)
Autonomous BLE mesh relay during severe network blackouts, powered by an anti-DoS message delivery backbone that never folds under attack.
Velocity (Zero Latency)
Sub-millisecond key exchange and signature verification powered by a high-efficiency Rust native cryptographic engine.
Lightness (Ultra-Lightweight)
Zero third-party telemetry, zero bloated SDKs. Radical minimalism engineered to conserve precious battery and memory.
High Security (Post-Quantum E2EE)
NIST-standard ML-KEM-1024 post-quantum key encapsulation, PQXDH, and Signal Double Ratchet ensuring sovereign confidentiality.
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
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No Internet? No Common Language?
Arc Keeps You Connected.
A commercial security product with a published engineering direction
Join us in shaping the future of communication.
A commercial security product with a published engineering direction
A commercial security product with a published engineering direction
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
Arc is designed to create a reason to switch—not to hide behind neutral language. Its differentiation is the combination of post-quantum E2EE, deliberate message retirement, low-bandwidth operation, and offline disaster communication.
Double Ratchet DM
PQXDH, Double Ratchet, Sender Keys, and explicit downgrade prevention.
Direct Mesh E2EE DM
Low-bandwidth voice evaluation and direct disaster communication with explicit security modes. Low-bandwidth voice evaluation and direct disaster communication with explicit security modes.
IGF
Messages deleted by IGF are completely removed from all devices and Arc's servers. No expired data is ever retained on our servers, making recovery impossible even for Arc.
Key Sync + multi-device
Authorize a one-time device transfer without copying the new device’s cryptographic identity. Every active device generates and protects its own identity and message keys.
Sealed Sender + anonymous delivery
PQXDH, Double Ratchet, Sender Keys, and explicit downgrade prevention.
20 Leading Messengers Competitive Benchmark
A rigorous 9-axis benchmark evaluating Signal (90/100), Arc (89/100), and 18 other global messengers across cryptography, quantum resilience, and crisis mesh.
Each primary source supports only the category where it is cited; it does not substantiate every claim or score and does not imply vendor endorsement.
View Full 20-Product Benchmark →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
Core Architecture & FAQ
Authoritative answers on DefenseTech, Post-Quantum Cryptography, offline mesh, and data sovereignty.
What is Atlas Associates Inc.?▼
What makes Arc messenger unique compared to other apps?▼
Why is Post-Quantum Cryptography (PQC) essential today?▼
How does Arc offline mesh communication work during disasters and network outages?▼
How does Arc differ from Signal, WhatsApp, and Telegram?▼
What is Atlas Associates' privacy and data sovereignty guarantee?▼
Private by Default. Free for Everyone.
Arc is available on iOS, Android, and macOS. Download the app to use the features available in your current build.
Company Overview
- Founded
- February 22, 2019
- Capital (including capital reserve)
- JPY 39,000,000