# rmk-rs/rmk

A modern, easy-to-use, and feature-rich keyboard firmware written in Rust.

Repository: https://github.com/rmk-rs/rmk
Canonical: https://ross.abutalabs.com/products/rmk
Homepage: https://rmk.rs
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: cortex-m, firmware, keyboard, rust, stm32, rp2040, embedded, keyboard-firmware, usb, usb-hid, esp32, nrf52, wireless
Last push: 2026-08-26T16:56:31+00:00

## Health v2 (maintenance only)
Score: 82/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 62, longevity 78
- inputs: {"age_days": 1092, "days_push": 7, "days_rel": 258, "gap_med": 10.5, "n_releases_24m": 25}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1736, forks 220 (observed 2026-08-28T04:05:29.047937+00:00)

## What it is
RMK is a feature-rich, async Rust keyboard firmware framework built on the Embassy ecosystem. It supports many microcontrollers (STM32, nRF52/54, RP2040, ESP32) with USB and BLE wireless connectivity, configurable via a single keyboard.toml file.

## Use cases
- build custom keyboard firmware in Rust
- make a wireless BLE mechanical keyboard
- configure keyboard keymaps with a toml file
- create a split keyboard with low battery power usage
- add Vial real-time keymap editing to a keyboard
- flash custom firmware to RP2040 or ESP32 keyboard
- build a keyboard with rotary encoders and trackpads

## When to choose
- you want a modern Rust-based alternative to QMK/ZMK
- you need BLE wireless support with months of battery life
- you want easy TOML-based configuration with optional Rust customization
- you target STM32, nRF, RP2040, or ESP32 microcontrollers

## When to avoid
- your microcontroller is not among the supported chips
- you need a mature ecosystem with extensive community keymaps and tooling like QMK
- you prefer C-based firmware or Arduino-style development
- you need features not yet implemented in RMK's feature matrix

## Facets
- artifact type: framework
- maturity: active
- function: embedded, sdk, configuration-management
- domain: embedded-systems, hardware, cross-platform, developer-tools
- platform: embedded, rust, cross-platform
- tags: keyboard-firmware, usb-hid, ble, embassy, vial, keymap, stm32, rp2040, esp32, nrf52, split-keyboard, wireless

## Member repositories
- rmk-rs/rmk (main) score 82

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:29.047937+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:30:42.723190+00:00, confidence not recorded.
  - readme: https://github.com/rmk-rs/rmk (fetched 2026-08-28T04:05:29.047937+00:00, sha 3b1e93c6e491)
  - homepage: https://rmk.rs (fetched 2026-08-29T11:07:57.431717+00:00, sha 671c692428f3)
  - site_page: https://rmk.rs/docs/user_guide/guide_overview.html (fetched 2026-08-29T11:07:57.440473+00:00, sha 033f5914367b)
  - site_page: https://rmk.rs/docs/getting_started/introduction.html (fetched 2026-08-29T11:07:57.442093+00:00, sha c7c9cc5741e9)
  - site_page: https://rmk.rs/docs/getting_started/introduction (fetched 2026-08-29T11:07:57.443874+00:00, sha 3b4e7edfbee3)
- Data as of 2026-08-30T08:39:29.467469+00:00.