Stay connected when the grid goes down.
Helius is an end-to-end encrypted messenger on a long-range LoRa mesh. Text, voice, photos and live location — with no internet, no cell service, and no SIM.
Built for when the network
isn't there.
A full messenger that lives on the radio mesh — not a stripped-down GPS beacon.
Long-range LoRa mesh
Kilometers of range per hop. Every device relays for the others, so the network grows as more people join.
Encrypted by default
AES-256 seals every payload — text, photos and voice alike. Relays forward ciphertext they can never read.
Text, voice & photos
Real conversations off-grid — typed messages, voice clips and images, not just location pings.
Live map of your people
See each node's position, signal strength and last-heard time on a fully offline map.
Multi-hop relay
Out of direct range? Frames hop node-to-node across the mesh until they reach you.
Phone, desktop & web
One app across Android, iOS, macOS, Windows and Linux — over Bluetooth or USB serial.
The mesh, done right.
What sets Helius apart from Meshtastic, MeshCore and the locked-down alternatives.
Encrypted media, not just text
Photos and voice are AES-256 sealed on air — not sent in the clear like most mesh firmware.
One translated ecosystem
App, docs and site speak your language — not an English-only patchwork of subdomains.
Flash in the browser
ESP32 and nRF52 boards flash over Web Serial — even convert a Meshtastic device to Helius.
Open & yours
No subscription, no account, no cloud. Free app, open hardware, your keys.
Off-grid in three steps.
Flash a device
Flash a T-Echo, T-Beam or Heltec straight from your browser — no toolchain.
Pair the app
Connect over Bluetooth or USB to the Helius app on any platform.
Message off-grid
Text, send voice and photos, and watch your mesh light up — no towers.
Runs on radios you can buy today.
Flash any supported board — or convert one you already own.
T-Echo
nRF52840T-Beam
ESP32Heltec V3
ESP32-S3Flash your device in the browser.
No SDK, no command line. Plug in over USB, pick your board, and flash — ESP32 and nRF52 alike. Even convert a Meshtastic device to Helius in one click.
See your whole mesh.
Every node's position, signal and last-heard time on a fully offline map — so you always know who's reachable and how far the network stretches.
Build your off-grid network.
Free app. Open hardware. Your keys. No towers, no accounts, no cloud.