# ct-js/ct-js-old

⚠️ Old repository of ct.js app. New repository here: https://github.com/ct-js/ct-js

Repository: https://github.com/ct-js/ct-js-old
Canonical: https://ross.abutalabs.com/products/ct-js-old
Homepage: https://ctjs.rocks/
Language: TypeScript
License: MIT
License Family: permissive
Topics: gamedev, game-engine, 2d-game-engine, pixijs, game-editor, html5-game-development, webgl, editor, javascript, pixi-js
Archived: true
Last push: 2024-11-17T07:51:34+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 40, longevity 100
- inputs: {"age_days": 2579, "days_push": 654, "days_rel": 668, "gap_med": 21, "n_releases_24m": 2}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1630, forks 125 (observed 2026-08-28T04:05:13.920199+00:00)

## What it is
Ct.js is a free, open-source 2D game engine and IDE built on PixiJS/WebGL for making HTML5, desktop, and mobile games. It offers visual level, UI, tilemap, and particle editors, event-based scripting in JavaScript, TypeScript, or the visual Catnip language, and one-click export for web and desktop.

## Use cases
- make a 2d html5 game without heavy coding
- build browser games with a visual level editor
- teach game development and programming to students
- create pixelart games with tilemaps and particle effects
- export a 2d game to desktop and web from one project
- prototype game mechanics with event-based scripting

## When to choose
- you want a free, beginner-friendly 2D game engine with visual editors
- you target HTML5/WebGL with optional desktop exports
- you prefer visual scripting (Catnip) alongside JavaScript/TypeScript
- you need built-in tilemaps, physics, sound, and UI tools in one IDE

## When to avoid
- you need 3D rendering or a 3D engine
- you require a fully code-first workflow without an IDE
- you need console (PS/Xbox/Switch) export support
- you want a headless engine library to embed in an existing build pipeline

## Facets
- artifact type: application
- maturity: active
- function: game-engine, editor, gui, graphics, animation
- domain: gaming-tools, cross-platform, education
- platform: cross-platform
- tags: 2d-game-engine, html5-games, pixijs, webgl, visual-scripting, level-editor, tilemap-editor, particle-systems, ide, catnip, game-development, desktop, web-server, javascript, typescript

## Member repositories
- ct-js/ct-js-old (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:13.920199+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 2026-08-30T03:47:52.905276+00:00, confidence not recorded.
  - readme: https://github.com/ct-js/ct-js-old (fetched 2026-08-28T04:05:13.920199+00:00, sha baef2d35763f)
  - homepage: https://ctjs.rocks/ (fetched 2026-08-29T11:20:57.064045+00:00, sha 50b27081b457)
  - site_page: https://ctjs.rocks/changelog (fetched 2026-08-29T11:20:57.073816+00:00, sha 393245369e5f)
- Data as of 2026-08-30T08:39:29.467469+00:00.