# radian-software/riju

⚡ Extremely fast online playground for every programming language.

Repository: https://github.com/radian-software/riju
Canonical: https://ross.abutalabs.com/products/riju
Homepage: https://riju.codes
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2026-03-27T20:46:44+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 74, release rhythm 35, longevity 100
- inputs: {"age_days": 1908, "days_push": 159, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1735, forks 206 (observed 2026-08-28T04:05:29.096277+00:00)

## What it is
Riju is an extremely fast online playground that lets users run code in hundreds of programming languages directly in the browser, with sub-second startup for interpreters and compilers. It is a self-hostable web service backed by containerized sandboxes, with a Monaco-based editor and terminal interface.

## Use cases
- try out a programming language without installing it
- run a quick python interpreter in the browser
- compile and run obscure esoteric languages like INTERCAL
- share a scratch environment for code experiments
- test code snippets across many languages quickly

## When to choose
- you want to experiment with a language instantly without local setup
- you need support for a very wide range of languages including esoteric ones
- you want a free, privacy-respecting online code runner

## When to avoid
- you need persistent file storage or long-running programs
- you are on an IPv4-only network without a VPN
- you need production-grade isolation guarantees for untrusted code

## Facets
- artifact type: service
- maturity: active
- function: developer-tools, interpreter, compiler
- domain: developer-tools, programming-languages, education
- platform: -
- tags: online-playground, code-execution, sandbox, multi-language, repl, web-server, docker, linux, nodejs

## Member repositories
- radian-software/riju (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:29.096277+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 2026-08-30T03:30:50.658679+00:00, confidence not recorded.
  - readme: https://github.com/radian-software/riju (fetched 2026-08-28T04:05:29.096277+00:00, sha ce6f78163198)
  - homepage: https://riju.codes (fetched 2026-08-29T11:08:22.044489+00:00, sha 13a32842873f)
- Data as of 2026-08-30T08:39:29.467469+00:00.