# facil.io

Header-file C library for evented network services, with an HTTP, WebSocket and Pub/Sub server.


Source: https://findsoftware.frbit.cloud/facil-io/
Last reviewed: 2026-10-26
Listed since: 2026-10-26

## Record

### Links

- home: https://facil.io
- repository: https://github.com/facil-io/cstl
- docs: https://facil.io/0.8.x/

### Identity

- status: active
- maintainer: Boaz Segev
- maintainerType: unknown
- parent: unknown
- firstRelease: 2017
- hqCountry: unknown

### Kind

- category: framework, library
- hosting: binary
- language: c
- runtime: binary
- runtimeMin: unknown
- basedOn: unknown

### Content

- contentStore: unknown
- databases: unknown
- adminUi: unknown
- headlessApi: unknown
- templating: mustache
- i18n: unknown

### Rendering and deploy

- runsAs: unknown
- renderingModes: unknown
- installMethod: copy the fio-stl.h header into the project

### License

- licenseModel: open-source
- license: MIT

### Releases

- currentMajor: 0
- latestReleaseDate: 2026-10-22

### Adoption

- githubStargazers: 134
- packagistDownloads: not applicable
- npmWeeklyDownloads: not applicable
- contributors: 3
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: unknown
- dependentPackages: unknown

### Sources

- urls: https://facil.io/ (read 2026-10-26)
- urls: https://api.github.com/repos/facil-io/cstl (read 2026-10-26)
- urls: https://facil.io/ (read 2026-10-26)
- maintainer: https://raw.githubusercontent.com/facil-io/cstl/master/LICENSE (read 2026-10-26)
- language: https://api.github.com/repos/facil-io/cstl (read 2026-10-26)
- category: https://facil.io/ (read 2026-10-26)
- runtime: https://facil.io/ (read 2026-10-26)
- installMethod: https://raw.githubusercontent.com/facil-io/cstl/master/README.md (read 2026-10-26)
- templating: https://facil.io/ (read 2026-10-26)
- license: https://raw.githubusercontent.com/facil-io/cstl/master/LICENSE (read 2026-10-26)
- firstRelease: https://api.github.com/repos/boazsegev/facil.io/releases (read 2026-10-26)
- currentMajor: https://api.github.com/repos/facil-io/cstl/releases (read 2026-10-26)
- latestReleaseDate: https://api.github.com/repos/facil-io/cstl/releases (read 2026-10-26)
- githubStargazers: https://api.github.com/repos/facil-io/cstl (read 2026-10-26)
- contributors: https://api.github.com/repos/facil-io/cstl/contributors (read 2026-10-26)

## Notes

facil.io is a C library for evented network services, usable from C++ as well. It is distributed as a header file that is copied into a project, and it includes a mini-framework for web applications with an HTTP, WebSocket and Pub/Sub server and Mustache template rendering. The project's site describes the current line as a single-header C core with an IO reactor, HTTP, Pub/Sub and TLS.

## Worth knowing

An older line, labeled legacy on the site, is the classic evented framework with HTTP, WebSockets, Pub/Sub and Redis, kept in a separate repository with its own documentation.

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0