Ace Editor

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

27143 stars · 5262 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Ace is a standalone, embeddable code editor written in JavaScript for the browser, originally developed as the primary editor for Cloud9 IDE. It offers native-editor-level performance and features such as syntax highlighting for 120+ languages, 20+ themes, code folding, multiple cursors, and customizable keybindings including Vim and Emacs modes.

Use cases

• embed a code editor in a web page
• replace a textarea with a syntax-highlighted editor
• build an online IDE or playground
• add syntax highlighting for 120+ languages to a web app
• support vim and emacs keybindings in a browser editor
• edit very large files in the browser
• add a live syntax checker to a web editor

When to choose

• you need a battle-tested, high-performance browser code editor
• you want broad language and theme support out of the box
• you need to handle huge documents (millions of lines) in the browser
• you want vim/emacs keybinding support or TextMate grammar import

When to avoid

• you need a full IDE with built-in project management and debugging
• you want a lightweight plain textarea with minimal footprint
• you need a native desktop editor rather than a web-embedded one
• you prefer a more modern editor like Monaco or CodeMirror for new projects

Facets

library · maturity stable

editor ui-components frontend-framework web-development frontend developer-tools text-editors browser cross-platform code-editor syntax-highlighting embeddable javascript browser-based-editor vim-mode emacs-mode code-folding multiple-cursors nodejs

Member repositories

For agents

markdown · JSON · MCP: product_card(name="ajaxorg/ace")