ProseMirror vs Quill

ProseMirror is a toolkit for developers building rich-text editors on the web. It supports structured documents through a WYSIWYG-style interface while letting applications define document shape and content. Instead of treating a document as an HTML blob, it gives application code control over a custom data structure. Schemas and plugins provide ways to customize that structure and extend editor behavior. Four core modules handle the document model, editor state, view, and transformations; additional modules offer commands, key bindings, undo history, input macros, collaboration, and a basic schema. Multiple people can edit together in real time. Examples cover Markdown, image uploads, custom schemas, menus, code editors, footnotes, and track changes. ProseMirror is free, open source, and legally usable commercially; it can be self-hosted and is installed through npm. It works in recent Firefox, Chrome, Safari, and Edge versions, as well as Internet Explorer 11. It is a modular toolkit rather than a ready-made editor component, and implementation generally involves a bundler.

Quill is a free, API-driven rich text editor for developers. Its API exposes content, changes and events using JSON, with operations that access or modify content by indexes and lengths. The document model supports extensions for custom formats and embeds, including slide decks, interactive checklists and 3D models. Built-in formatting covers text styles, links, headings, lists, alignment, code blocks, images and video; formulas require KaTeX. Official modules provide configurable toolbar, clipboard, keyboard, history and syntax features. History supports undo and redo with adjustable delay, stack size and handling of programmatic changes. Clipboard matchers control copy, cut and paste, and the documentation warns that unsafe HTML handling can create cross-site scripting vulnerabilities. Developers can configure toolbar handlers or provide custom HTML. Quill includes Snow and Bubble themes, runs in modern desktop, tablet and phone browsers, and can be loaded from jsDelivr or npm with full and core builds. Slab maintains it under a BSD license for personal and commercial projects.