# xamarin/XobotOS

XobotOS - Android ported to C#

Repository: https://github.com/xamarin/XobotOS
Canonical: https://ross.abutalabs.com/products/xobotos
Language: Java
License Family: other
Archived: true
Last push: 2016-02-19T19:28:20+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5238, "days_push": 3848, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1241, forks 243 (observed 2026-08-28T04:04:06.283834+00:00)

## What it is
XobotOS is a Xamarin research project that semi-automatically ported Android 4.0 from Java/Dalvik to C#, exploring performance and memory benefits. Its main lasting output is a greatly enhanced version of the Sharpen Java-to-C# source translation tool.

## Use cases
- port a large Java codebase to C#
- translate Java source code to C# automatically
- run Android framework code in C#
- study performance of C# versus Java/Dalvik
- convert Java generics-heavy code to C#

## When to choose
- you need a mature Java-to-C# source translator for complex codebases
- you want to study how Android internals map to C#

## When to avoid
- you want to build modern Android apps in C# (use Xamarin/.NET MAUI instead)
- you need maintained, supported software
- you want to run Android on devices today

## Facets
- artifact type: library
- maturity: abandoned
- function: compiler, interpreter, developer-tools
- domain: compilers, programming-languages, mobile-development, cross-platform
- platform: dotnet, cross-platform
- tags: java-to-csharp, source-translation, sharpen, android-runtime, research-project, android, linux

## Member repositories
- xamarin/XobotOS (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:06.283834+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 2026-08-30T05:08:31.595320+00:00, confidence not recorded.
  - readme: https://github.com/xamarin/XobotOS (fetched 2026-08-28T04:04:06.283834+00:00, sha 63548f8ad6d3)
- Data as of 2026-08-30T08:39:29.467469+00:00.