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ExpressLRS Configurator

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ExpressLRS Configurator is a cross-platform build & configuration tool for the ExpressLRS - open source RC link for RC applications.

Need help? Confused? Join the Community!

Support ExpressLRS

Supporting ExpressLRS is as easy as contributing a feature, either code or just a fleshed out idea. Coding not your thing? Testing a Pull Request using the convenient Configurator tab and providing feedback is essential as well. We're all working together.

If you don't have the time to contribute in that way, consider making a small donation. Donations are used to buy test equipment, software licenses, and certificates needed to further the project and make it securely accessible. ExpressLRS accepts donations through Open Collective, which provides recognition of donors and transparency on how that support is utilized.

Open Collective backers

Quick Start Guide

If you have hardware that you want to flash, please refer to our guides on the website, and our FAQ


We provide a standalone program for 64bit Windows, Linux and Mac.

Download the installer from Releases page.



The minimum required version of windows is Windows 8.


Changes to the security model used in the latest versions of MacOS X 10.14 (Mojave) and 10.15 (Catalina) mean that the operating system will show an error message ('"ExpressLRS" cannot be opened because the developer cannot be verified') when trying to install the application.

To work around this, click ExpressLRS while pressing control key, and click Open. In the popup, you'll be able to forcefully open the application. (you may need to try this twice.)

Alternatively, run the following command in a terminal after installing:

sudo xattr -rd /Applications/ExpressLRS\


Linux users have to install udev rules for PlatformIO supported boards/devices. The latest version of rules may be found at

This file must be placed at /etc/udev/rules.d/99-platformio-udev.rules (preferred location) or /lib/udev/rules.d/99-platformio-udev.rules (required on some broken systems).

Please open system Terminal and type:

# Recommended
curl -fsSL | sudo tee /etc/udev/rules.d/99-platformio-udev.rules

# OR, manually download and copy this file to destination folder
sudo cp 99-platformio-udev.rules /etc/udev/rules.d/99-platformio-udev.rules

Restart "udev" management tool:

sudo service udev restart
# or
sudo udevadm control --reload-rules
sudo udevadm trigger

Ubuntu/Debian users may need to add own "username" to the "dialout" group if they are not "root", doing this issuing:

sudo usermod -a -G dialout $USER
sudo usermod -a -G plugdev $USER

Similarly, Arch users may need to add their user to the “uucp” group

sudo usermod -a -G uucp $USER
sudo usermod -a -G lock $USER
Ubuntu 18.XX / Older Debian installs troubleshooting

On Ubuntu 18.XX you are not able to get recent git version by default, and some other system dependencies are missing.

Read more about this in issue #26.

To work around that you can manually install required packages:

# install missing sys packages
sudo apt update
sudo apt-get install gconf2 gconf-service python3-distutils

# install git version >= 2.25
sudo add-apt-repository ppa:git-core/ppa
sudo apt update
sudo apt install git


Please do not submit pull requests for translation changes, but read and follow the instructions below!

ExpressLRS Configurator has been translated into several languages. The application will try to detect and use your system language if a translation into this language is available.

If you prefer to have the application in English or any other language, you can select your desired language in the "Settings" menu.

We want to make ExpressLRS accessible for pilots who are not fluent in English. We have got a team of volunteer translators who do this work, but additional translators are always welcome to share the workload, and we are keen to add additional languages. If you would like to help us with translations, you have got the following options:

  • if you help by suggesting some updates or improvements to translations in a language you are familiar with, head to and add your suggested translations there.
  • if you would like to start working on the translation for a new language, or take on responsibility for proof-reading the translation for a language you are very familiar with, please head to the ExpressLRS Discord chat (registration here), and join the #configurator-translation channel - the people in there can help you to get a new language added, or set you up as a proof reader.

Our localisation progress:

Translations progress


Main screen

Compile result


 - - - - - - - - - - - - - - - - - - - -
|          ExpressLRS-Configurator      |
|                   |                   |
|     renderer      |        main       |
|                   |                   |
|   configurator <----->  api-server    |
|                   |          |        |
|                   |          V        |
|                   |      platformio   |
|_ _ _ _ _ _ _ _ _ _|_ _ _ _ _ | _ _ _ _|
                      ExpressLRS hardware

This Electron application is split into two parts: a local API server that does all the work, and a UI layer. Both of these application layers communicate within each other using Graphql protocol.

Heavy use of TypeScript and @graphql-codegen/cli is made throughout the repository to ensure the datatypes transmitted between the API and UI layers are consistent at compile-time and Graphql ensuring the datatypes are consistent at runtime.

Starting Development


  • node >=16.0
  • git >= 2.25
  • python >= 3.6
  • platformio >= 5.0

Start the app in the dev environment:

yarn install --frozen-lockfile
yarn start

In order to simulate WI-FI devices on your local network you can start application with MULTICAST_DNS_SIMULATOR_ENABLED environment variable:

npx cross-env MULTICAST_DNS_SIMULATOR_ENABLED=true yarn start

Other useful cli commands

Generate TypeScript types from Graphql schema and Queries located in src/ui/gql/queries:

yarn run gql-codegen

Legal disclaimer

The use and operation of this type of device may require a license, and some countries may forbid its use. It is entirely up to the end user to ensure compliance with local regulations. This is experimental software / hardware and there is no guarantee of stability or reliability. USE AT YOUR OWN RISK.

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