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🇺🇸English🇯🇵日本語🇸🇦العربية🇧🇩বাংলা🇩🇪Deutsch🇪🇸Español🇫🇷Français🇮🇳हिन्दी🇮🇩Bahasa Indonesia🇮🇹Italiano🇮🇱עברית🇰🇷한국어🇲🇾Bahasa Melayu🇵🇱Polski🇵🇹Português🇷🇺Русский🇹🇭ไทย🇹🇷Türkçe🇻🇳Tiếng Việt🇨🇳中文
ArcArc

Live your own story

Privacy-First E2EE Messenger with Post-Quantum Cryptography & Offline Mesh

Download on the App StoreGET IT ON Google Play
Tips & FAQs
Live your own storyThe Intelligent Messaging App for the NextGen
05 / 06
Localization · 20 Languages

20 languages, worldwide.

App UI in 20 languages, AI characters across 100+ languages. A messenger built to cross language barriers — from Japan, for the world.

BUILT FOR THE WORLD, FROM JAPAN.

こんにちは
日本語
Hello
English
Bonjour
Français
Hallo
Deutsch
Hola
Español
Ciao
Italiano
Olá
Português
Привет
Русский
你好
中文
안녕
한국어
مرحبا
العربية
שלום
עברית
नमस्ते
हिन्दी
สวัสดี
ไทย
Xin chào
Tiếng Việt
Halo
Indonesia
Selam
Türkçe
হ্যালো
বাংলা
Cześć
Polski
Helo
Bahasa Melayu
20
App UI languages
100+
AI character languages

Product Identity

Privacy First

These eleven capabilities form one completed product specification and are evaluated together as Arc.

Offline Capable

Resource-bounded relay, deduplication, TTL, and offline recovery without claiming a guaranteed distance, route, or delivery time.

AI Characters

Six cloud AI characters support conversations with distinct expertise.

MUTUAL BURN × IGF

Some messages should leave beautifully.

Mutual Burn turns shared consent into a synchronized exit. IGF gives every message an expiry of its own. Both protect plaintext on your devices; encrypted server copies follow Arc's plan-based deletion schedule.

MUTUAL BURN · ESSENTIAL + PREMIUM + INTELLIGENCE · 1:1

One decision. Both copies vanish.

Mutual Burn makes a 1:1 message disappear once both people have confirmed they read it by tapping the mail icon. The plaintext is then purged from both devices within about 20 seconds — or roughly 1 second if you tap the flame icon. Mutual Burn is available on all plans, for direct messages only.

  • A + B
  • Essential · Premium · Intelligence
  • 1:1 ✓ · 1:n ×
A → BREAD-TRIGGERED AUTO BURN

LEFT: After B reads it, the message vanishes from both A and B after 20 seconds.

A → BTAP-TRIGGERED MANUAL BURN

RIGHT: When B taps the message, it vanishes from both A and B in about one second.

IGF · IGNITE THE FIRE

Time becomes visible. Then it becomes fire.

Below 24 hours, the countdown turns blue. It shifts to green below one hour, gold inside the final 10 minutes, and vermilion below one minute. For the final 10 seconds, the flame intensifies before the active theme launches one of four Arc endings 1.2 seconds before the device copy is removed at expiry.

12s PV · Sky + Bloom · 4 × 12 = 48
DELIGHTFUL DETAILS

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.

CORE FEATURES

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

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 →

Arc Reactions

100 unique reactions for every moment

100 ReactionsAll Reactions🌸 18
›
AI CHARACTERS

AI Characters

Meet Arc's cloud AI characters.

SEAN
4 Cloud AI LineupDynamic Thinking
›

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

Meet Arc's cloud AI characters.

Security

COMPLETED Arc PRODUCT SPECIFICATION

Secure Device Transfer

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.

Pricing

COMPLETED Arc PRODUCT SPECIFICATION

Tracker

COMPLETED Arc PRODUCT SPECIFICATION