# dotnet/Comet

Comet is an MVU UIToolkit written in C#

Repository: https://github.com/dotnet/Comet
Canonical: https://ross.abutalabs.com/products/dotnet-comet
Language: C#
License: MIT
License Family: permissive
Archived: true
Last push: 2024-12-07T08:29:01+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2636, "days_push": 634, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1670, forks 125 (observed 2026-08-28T04:05:20.055548+00:00)

## What it is
Comet is a C# UI toolkit for building cross-platform user interfaces using the Model-View-Update (MVU) architectural pattern, built on top of .NET MAUI. It provides declarative view definitions, automatic state-driven databinding, and hot reload support for a fast development experience.

## Use cases
- build cross-platform mobile and desktop UIs in C#
- write declarative user interfaces using the MVU pattern
- create .NET MAUI apps without XAML
- manage UI state with automatic databinding
- develop UIs with hot reload in Visual Studio

## When to choose
- you prefer the MVU/Elm-style architecture over XAML or MVVM
- you want a single C# codebase for iOS, Android, macOS, and Windows UIs
- you value hot reload and minimal boilerplate for UI development
- you are already invested in the .NET ecosystem

## When to avoid
- you need a production-hardened, fully supported UI framework today
- your team relies on XAML-based workflows or extensive third-party control libraries
- you need platforms outside the .NET MAUI targets
- you require long-term stability guarantees, as the project is experimental

## Facets
- artifact type: framework
- maturity: experimental
- function: frontend-framework, ui-components, state-management, mobile-framework
- domain: web-development, frontend, mobile-development, cross-platform, developer-tools
- platform: cross-platform, dotnet, c, windows
- tags: mvu, maui, csharp, ui-toolkit, hot-reload, declarative-ui, xamarin, mobile, android, ios, macos

## Member repositories
- dotnet/Comet (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:20.055548+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 2026-08-30T03:42:44.281914+00:00, confidence not recorded.
  - readme: https://github.com/dotnet/Comet (fetched 2026-08-28T04:05:20.055548+00:00, sha 967b9f48c36f)
- Data as of 2026-08-30T08:39:29.467469+00:00.