DefenseTech
COMPLETED ARC PRODUCT SPECIFICATION
These eleven capabilities form one completed product specification and are evaluated together as Arc.
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GET IT ON Google PlayThree Pillars. One Mission: A Free, Global Communication Layer.
These eleven capabilities form one completed product specification and are evaluated together as Arc.
E2EE
End-to-End Encryption (E2EE)
Signal Protocol · Double Ratchet
Atomic ratchet advancement, exact-ciphertext retry, bounded skipped keys, and crash-safe recovery for normal one-to-one chat.
PQC
Post-Quantum Cryptography (PQC)
ML-KEM-1024 · PQXDH
Hybrid post-quantum session establishment with classical key agreement and no silent downgrade to a legacy path.
MESH
Mesh Network
BLE · Direct · Store-and-Forward
Resource-bounded relay, deduplication, TTL, and offline recovery without claiming a guaranteed distance, route, or delivery time.
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.
COMPLETED ARC PRODUCT SPECIFICATION
Join us in shaping the future of communication.
COMPLETED ARC PRODUCT SPECIFICATION
COMPLETED ARC PRODUCT SPECIFICATION
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
These eleven capabilities form one completed product specification and are evaluated together as Arc.
Double Ratchet DM
Atomic ratchet advancement, exact-ciphertext retry, bounded skipped keys, and crash-safe recovery for normal one-to-one chat.
Direct Mesh E2EE DM
Direct disaster messaging with authenticated origin and integrity, explicitly labeled non-E2EE because relays or nearby observers may see content. A separate direct-message mode with end-to-end encrypted content, explicit trust state, and no silent fallback to signed non-E2EE delivery.
IGF
Device-side timed disappearance is available for DM and Group. Durable server/media retirement remains an adopted implementation target.
Key Sync + multi-device
Planned for every plan: Essential normally keeps one active device and temporarily permits a migration pair; the old device is revoked only after verified commit/read-back. Premium and Intelligence target up to three active devices.
Sealed Sender + anonymous delivery
Purpose-separated sender certificates, opaque recipient inboxes, generic push, and a no-plaintext-fallback rule.
COMPLETED ARC PRODUCT SPECIFICATION
These eleven capabilities form one completed product specification and are evaluated together as Arc.
Competitor cards link to first-party sources. Arc's card is bound to its completed product specification and the same scoring model.
20-product evidence and specification cards →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
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.
FOUNDER & CEO
Takayuki Miyano
- Founded
- February 22, 2019
- Capital (including capital reserve)
- JPY 34,200,000