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What is Meshtastic?

Meshtastic is an open source project that turns small, affordable radio modules into a mesh communication network. It is the technology running inside the devices we sell at Karida.

How the mesh works​

Each device is both a sender and a relay. When you send a message, your device broadcasts it over radio. Any nearby Meshtastic device that hears it will automatically forward it further, until the message reaches its destination. This is what "mesh" means: every device strengthens the network.

This approach has some useful properties:

  • No central infrastructure. There is no server, no tower, no internet connection involved. The devices talk directly to each other.
  • Range extends with more devices. A single device pair might reach 1-3 km in forested terrain. Add a device on a ridgeline and that range doubles or more.
  • Encrypted by default. Messages are encrypted end-to-end. Devices outside your group cannot read your messages even if they relay them.

What it can do​

  • Send text messages between devices
  • Share GPS positions on a shared map
  • Support multiple private channels for different groups
  • Transmit simple sensor readings (temperature, battery, custom data)
  • Work without any internet or cell connection

Why Meshtastic?​

Meshtastic is widely used, actively maintained, and runs on inexpensive hardware. The app is available for iOS and Android. Because it is open source, there is no vendor lock-in and no risk of a company discontinuing the service.

We chose Meshtastic because it is the most practical and accessible option for groups who want reliable off-grid communication without specialist radio knowledge.

Using Meshtastic in Japan​

Japan requires radio devices to carry Giteki certification (技適) before they can be legally used. Not all Meshtastic hardware sold internationally is certified for Japan.

All devices in the Karida shop are Giteki-certified for the Japan 920 MHz band. See Legal and Compliance for more detail.

Further reading​