# weston-embedded/uC-OS3

µC/OS-III is a preemptive, highly portable, and scalable real-time kernel. Designed for ease of use on a huge number of CPU architectures.

Repository: https://github.com/weston-embedded/uC-OS3
Canonical: https://ross.abutalabs.com/products/uc-os3
Language: C
License: Apache-2.0
License Family: permissive
Topics: rtos, real-time, os, os-iii, micrium, kernel, ucos-iii
Last push: 2026-07-15T16:23:49+00:00

## Health v2 (maintenance only)
Score: 64/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 92, release rhythm 8, longevity 100
- inputs: {"age_days": 2378, "days_push": 49, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1086, forks 350 (observed 2026-08-28T04:03:32.085382+00:00)

## What it is
µC/OS-III is a preemptive, highly portable, scalable real-time kernel (RTOS) originally developed by Micrium and now maintained by Weston Embedded Solutions. It is written in C and designed for use across a huge number of CPU architectures in mission-critical embedded applications.

## Use cases
- run a preemptive real-time kernel on a microcontroller
- build safety-critical firmware for medical or aerospace devices
- schedule multiple tasks with deterministic timing on an embedded CPU
- port an RTOS to a new CPU architecture
- replace a bare-metal main loop with a multitasking kernel

## When to choose
- you need a proven, certified RTOS for safety-critical products
- you want a highly portable kernel supporting many CPU architectures
- you need preemptive multitasking with scalability in embedded C

## When to avoid
- you are building a desktop, mobile, or web application
- you need a general-purpose OS with drivers and a userland
- you prefer a modern open-source RTOS ecosystem like Zephyr with broader community tooling

## Facets
- artifact type: library
- maturity: stable
- function: embedded, concurrency, scheduling
- domain: embedded-systems, operating-systems
- platform: embedded, c, iot, cross-platform
- tags: rtos, real-time-kernel, preemptive-scheduling, micrium, safety-critical, real-time

## Member repositories
- weston-embedded/uC-OS3 (main) score 64

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:32.085382+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 2026-08-30T06:49:37.600512+00:00, confidence not recorded.
  - readme: https://github.com/weston-embedded/uC-OS3 (fetched 2026-08-28T04:03:32.085382+00:00, sha 4f90e562fdcf)
- Data as of 2026-08-30T08:39:29.467469+00:00.