Apache NuttX vs OpenWrt
Apache NuttX
nuttx.apache.orgOpenWrt
openwrt.orgSide by side
| Figure | Apache NuttX | OpenWrt |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | Yes | Yes |
| Web | — | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 2 |
| Spec score · Operating Systems | 9.0 (#2) | 8.6 (#5) |
| Spec score · IoT Operating Systems | 9.0 (#1) | 8.7 (#2) |
| Company profile | LinkedIn lists NuttX as a public organization with 2–10 employees, Wilmington, Delaware headquarters and a 2007 founding year. | LinkedIn classifies OpenWrt as a nonprofit software-development organization founded in 2003 with 11–50 employees. |
| Extensibility | Architecture APIs, board configurations, driver skeletons, host tools and configuration variables are documented for adding platforms and features. | Developer feeds can load package recipes from Git, version-control repositories, local filesystems or other supported URLs. |
| License | NuttX is distributed under the Apache License 2.0. | The build environment is generally GPLv2, while bundled third-party components may use their own open-source or public-domain licenses. |
| Product | Apache NuttX is a real-time operating system for embedded systems, designed with an emphasis on standards compliance and a small footprint. | OpenWrt is a Linux operating system for embedded devices, typically wireless routers. |
| Self-hosting | NuttX is obtained as source repositories or release archives and built for selected boards or simulator targets by the developer. | Building OpenWrt on an OpenWrt device is possible but documented as experimental and requiring workarounds. |
| Support | The project homepage lists a main mailing list and Discord as community channels, and describes NuttX as maintained by volunteers. | The project says support may be provided voluntarily by developers and users, but is not guaranteed. |
| What it does | Apache NuttX is a free, open-source real-time operating system for deeply embedded devices. | OpenWrt is a Linux distribution and replacement firmware for embedded devices, especially wireless routers. |
Plans
In their own words
Apache NuttX
Apache NuttX is a real-time operating system for embedded systems, designed for a small footprint and standards-oriented development. It scales across 8-bit to 64-bit microcontroller environments and supports more than 15 CPU architectures, including ARM, RISC-V, x86, and Xtensa. The project lists support for more than 300 hardware boards and over 1,500 configuration templates for prototyping and production. NuttX uses POSIX and ANSI as its main standards, with POSIX serving as a development guideline rather than a licensed trademark claim. Optional filesystem support includes VFAT, ROMFS, littlefs, and NFS version 3 over UDP, and networking includes a BSD-compatible socket interface. It is free and open-source software, with separate release artifacts for the OS and integrated Apps. The configurable build system targets physical boards and devices as well as documented simulator targets. Its pseudo root filesystem can work without physical storage; mounting a true filesystem requires the relevant drivers and filesystem support. The project lists a main mailing list and Discord as community channels and is maintained by volunteers.
OpenWrt
OpenWrt is a Linux operating system for embedded devices, commonly wireless routers. Its writable filesystem and optional package management let users customize devices by adding packages; the project lists more than 27,000 packages and services. Configuration is available through an SSH command-line interface or a web interface, and the Table of Hardware helps check device support before installation. Hardware capacity is a key consideration: OpenWrt identifies 8 MB flash and 64 MB RAM as bare minimums, while warning against devices at those limits for current, secure use. The downloads page lists OpenWrt 25.12.5 as the current stable release and describes development snapshots as generally untested. The older 24.10 release is slated to receive limited security and bug fixes for some time. OpenWrt is free software, with no subscription or licensing fees. The project says users should know GNU/Linux and basic networking concepts before installing it; voluntary support from developers and users is not guaranteed.