Your devices
already share
a network.
Offline Era is a peer-to-peer LAN messenger built for teams that work without internet. Messages, files, presence — no server, no cloud, no accounts.
Built for the
air-gapped reality.
Real-time chat
Instant peer-to-peer messages over TCP. Read receipts, seen indicators, unread boundaries — everything you expect, none of the cloud.
Drag & drop transfer
Send any file directly device-to-device. Preview PDFs and images inline. No size limits, no upload queues.
Live presence
Active, background, and offline states updated in real time via UDP broadcast. Know who's available before you send.
IP masking
Biometric-gated IP reveal — Touch ID on Mac, fingerprint on Android, Windows Hello on PC. Your network address stays hidden by default.
Exactly what you need.
Nothing you don't.
Where the internet
is not an option.
Government offices
Secure internal comms on isolated intranets. No data ever touches the public internet.
Air-gapped labs
Research environments where internet access is prohibited. Offline Era was built exactly for this.
Field operations
Remote sites, military, disaster response. If devices share a network, it works.
Schools & campuses
Local network messaging without cloud accounts or student data leaving the building.
Zero config.
Just connect.
UDP multicast handles discovery. TCP handles everything else. No router config, no port forwarding, no accounts.
Connect to the same network
WiFi, ethernet, or hotspot. As long as devices share a subnet, Offline Era finds them automatically via UDP multicast.
Devices discover each other
No pairing, no accounts. A stable UUID identifies each device across DHCP reassignments and reinstalls.
Start messaging
Open a chat, drag files, check who's online. Everything is direct TCP — nothing leaves your local network.
Free. Always.
Open source under MIT. Self-host it, fork it, read every line.
macOS
Apple Silicon + Intel
Windows
Windows 10 / 11
Android
Android 8+
iOS / iPadOS
iOS 16+