# praeclarum/Ooui

A small cross-platform UI library that brings the simplicity of native UI development to the web

Repository: https://github.com/praeclarum/Ooui
Canonical: https://ross.abutalabs.com/products/ooui
Language: C#
License: MIT
License Family: permissive
Topics: dotnet, csharp, ui, cross-platform, html, websockets
Last push: 2022-12-07T19:46:33+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3368, "days_push": 1365, "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 1621, forks 164 (observed 2026-08-28T04:05:12.428305+00:00)

## What it is
Ooui is a small cross-platform UI library for .NET that lets developers build web UIs using classic object-oriented C# code, with the browser acting as a dumb renderer controlled over WebSockets. It includes ASP.NET Core integration, a Xamarin.Forms backend, and a WebAssembly packaging option.

## Use cases
- build web apps in c# without writing javascript
- create interactive ui with native-style code
- run xamarin.forms apps in the browser via webassembly
- serve collaborative real-time ui over websockets
- integrate dotnet ui into asp.net core apps

## When to choose
- you are a .NET developer who wants web UIs without JavaScript
- you want to reuse Xamarin.Forms-style code in the browser
- you need simple server-driven real-time UI over websockets

## When to avoid
- you need a modern, actively maintained framework with a large ecosystem
- you want fine-grained control over frontend rendering or SPA tooling
- you need high-performance client-side interactivity without server round-trips

## Facets
- artifact type: library
- maturity: maintenance
- function: ui-components, web-framework, websocket, ssr
- domain: web-development, frontend, cross-platform
- platform: dotnet, browser, wasm
- tags: csharp, xamarin-forms, aspnet-core, object-oriented-ui, html, web-server

## Member repositories
- praeclarum/Ooui (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:12.428305+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 2026-08-30T03:49:15.662091+00:00, confidence not recorded.
  - readme: https://github.com/praeclarum/Ooui (fetched 2026-08-28T04:05:12.428305+00:00, sha 9cb870d5a7e0)
- Data as of 2026-08-30T08:39:29.467469+00:00.