Talk to anyone.And to God.Off the grid.
A handheld radio computer. Message and push-to-talk — to people and to your own AI — over long-range radio. No SIM. No cell tower. No internet.
License-free 868/915 MHz · End-to-end encrypted · Mesh · Made for blackouts, backcountry, and privacy.
- EU-built
- Balance at ship
- Open firmware
- LoRa Alliance band
- Band
- 868 / 915 MHz · license-free
- Range (LOS)
- ~10 km device↔device · ~15 km to elevated node *
- Battery
- 18650 · ~24h mixed *
- Crypto
- X25519 · AES-256-GCM
- AI
- On-device · no cloud
- Ship
- Q3 2027
- Price
- €499 · €99 deposit
- License
- None required
One mesh. A family of devices.
Full catalog →
The grid is not the world.
Every conversation you have travels through somebody else's tower, somebody else's cable, somebody else's data center. When it goes down — in a storm, a blackout, a border, a war — you go silent.
RAYDIO is a radio computer that owes nothing to that grid. It speaks directly, device to device, on license-free spectrum, end-to-end encrypted. It carries text, voice, and your own private AI — so you can still think out loud when the internet goes dark.
Three pieces. Off-the-shelf where it works. Hand-tuned where it matters.
Three pieces. No middleman.
01 — Long-range radio
Sub-GHz LoRa on 868 / 915 MHz. License-free almost everywhere. Kilometres of line-of-sight, hundreds of metres through buildings.*
02 — Mesh, not a tower
Each RAYDIO is a node. Messages hop between devices automatically. The more people carry one, the further the network reaches.
03 — Your AI, on-device
A small local model lives inside RAYDIO. Ask, dictate, translate, journal — without sending a single token to a cloud.
* Real-world range depends on terrain, antenna, weather, and how many nodes are nearby. We will publish independently measured field tests before shipping.
Your home, on your own frequency.
Pair RAYDIO with a small base unit at home. Control, query, and listen — over radio, not Wi-Fi. Your house stays off the cloud.
* Home Agent is on the roadmap, not in the box. RAYDIO vol.1 ships first; the base unit follows in a separate batch.
Every device makes it bigger.
RAYDIO is a mesh. There is no server to pay, no account to lose, no company that can switch it off. Your range is the range of the people around you who also carry one.
When the grid isn't enough.
Backcountry
Mountains, sea, desert. Where there is no signal and never will be.
Blackouts
Storms, outages, infrastructure failure. Stay in contact with your people.
Privacy
Conversations that never touch a cell tower or a cloud. End-to-end, by design.
Crews & crowds
Festivals, sets, expeditions. Push-to-talk to a group, without a SIM each.
Thinking alone
Talk to your private AI on a walk. No phone. No feed. No surveillance.
Field notes. No marketing.
One signal per month: range test data, prototype photos, the occasional honest setback. Unsubscribe in one tap.
We make tools for the world after the grid.
CYMRU is a small hardware studio building computers that don't need permission. RAYDIO is volume one. There will be others.
Hardware that outlives the company that made it. Open firmware. Replaceable cell. Field-repairable. Documented down to the schematic.