Side-by-Side Markdown Editors

Marktext is a cross-platform desktop application designed for markdown document authoring and structured note-taking. It functions as a WYSIWYG text processor, providing a distraction-free interface that renders formatted content in real-time while hiding the underlying markup syntax. The application utilizes a multi-process architecture that separates system integration from the user interface, ensuring consistent performance across Windows, macOS, and Linux. By employing a custom editor core built on native browser capabilities and a structured syntax tree, it manages complex document elements such as mathematical expressions, diagrams, and code blocks. The software includes a plugin-based extension system that allows for the injection of custom functionality and interface components. It is distributed as an open-source project, maintaining a consistent environment for technical documentation and personal knowledge management.

MiaoYan is a local Markdown editor and personal knowledge management tool. It functions as a system for writing and organizing documents stored as local files, supporting the creation of a connected information network through bidirectional links and backlinks. The project includes a specialized tool for converting Markdown documents into slide-based presentations by using specific content separators. It also provides a command-line interface for managing files, allowing users to create, search, and open documents without a graphical file explorer. The editor features a side-by-side live preview with synchronized scrolling and supports the rendering of technical diagrams and mathematical formulas. Additional capabilities include local document versioning to track note history and a search-and-replace utility that operates across both the editor and the preview panes.

MarkEdit is a high-performance Markdown text editor and document navigator. It provides a scriptable editing environment that supports side-by-side HTML rendering for real-time formatting previews. The editor is distinguished by a multi-caret engine that enables rectangular block selections and simultaneous modification of multiple text ranges. It allows for extensive interface and functional customization through external CSS stylesheets and the integration of system-level scripts to automate repetitive tasks. The application includes tools for managing large documents, such as content block folding, a clickable table of contents for structural navigation, and regular expression-based document statistics. It also covers linguistic validation through spelling and grammar checks, as well as automated completion for text, internal anchors, and file paths. The software extends to the system level by providing quick file creation via system menus and formatted content previews within the system file browser.

Boostnote is a local-first note management system and markdown text editor designed for personal knowledge management. It functions as a desktop application that reads and writes markdown files directly to the local disk, allowing for the creation of a searchable personal knowledge base and digital garden. The application provides a writing interface that renders markdown syntax in real time. It is used to organize fragmented information, maintain project documentation, and author structured technical guides.

StackEdit is a browser-based Markdown editor designed for structured document authoring and collaborative content creation. It functions as an offline-first web application, allowing users to maintain full access to their documents and editing tools without an active internet connection, with changes automatically synchronized once connectivity is restored. The platform distinguishes itself through its support for real-time multi-user collaboration, utilizing operational transformation to merge concurrent edits from multiple participants. It features a modular architecture that supports specialized content rendering, including mathematical expressions, diagrams, and musical scores, alongside a plugin-based system for extending Markdown syntax. Users can configure specific Markdown flavors to ensure compatibility across different technical environments. Beyond its primary interface, the project provides an embeddable editor component that can be integrated into external websites via sandboxed frames. It includes built-in cloud storage adapters for file synchronization and publishing, and supports containerized deployment within cluster environments.

Ghostwriter is a distraction-free markdown text editor and document processor. It provides a focused writing environment for composing documents using markdown syntax, separating the drafting process from final formatting. The application features a minimalist interface designed to minimize visual clutter, including the ability to disable deletion keys to enforce a forward-only drafting flow. It includes a live statistics dashboard for tracking word counts and session metrics, as well as visual highlighting that fades non-active text to focus attention on the current line, sentence, or paragraph. The tool supports technical writing workflows through the rendering of mathematical equations, tables, and footnotes. It provides real-time HTML previews and integrates with external conversion engines to export documents into various final formats. Additional capabilities include a sidebar for document structure navigation, automatic character matching, automated file backups, and visual theme customization.

Notable is a local-first markdown note taking application and document manager. It functions as a personal knowledge base that persists notes as plain text files on the local disk to ensure data portability and user ownership. The application provides a markdown editor featuring a split-pane live preview for real-time rendering of content, including mathematical expressions and diagrams. Information is organized through a hierarchical tagging system that allows for nested labels and multi-dimensional categorization. The software includes tools for bulk note management to apply operations across multiple files simultaneously and a minimalist interface mode for distraction-free writing.

Leanote is a collaborative Markdown editor, hierarchical note manager, and self-hosted blogging platform. It functions as a knowledge base that uses a document store to organize structured notebooks and rich-text documents. The system enables real-time co-authoring, allowing multiple users to simultaneously edit documents and brainstorm ideas. It also includes a publishing engine that transforms private notes into public-facing blogs using customizable themes and multi-contributor management. The platform provides tools for knowledge management through notebooks and tags, supporting both rich-text and Markdown editing. Additional capabilities include a role-based permission system for managing shared access and utilities for exporting notes to PDF.

fsnotes is a markdown notes manager and cross-platform markdown editor for macOS and iOS. It functions as a personal knowledge base that organizes plain text and markdown files across folders using tags and bidirectional links. The system provides a secure environment through an encrypted plain text notebook that protects individual notes and folders. It implements Git-based note versioning to track document changes and maintain backups, while relying on external cloud storage services to synchronize files across devices. The application renders mathematical formulas, diagrams, and syntax-highlighted code. It monitors the file system in real time to maintain synchronization when files are modified in external third-party text editors.

Atom is an extensible code IDE and hackable text editor designed for source code editing and the creation of custom development environments. It functions as a syntax highlighting editor and a version control integrated editor that tracks file changes and synchronizes code with remote repositories. The editor allows for the modification of its own core functionality and supports a package-based plugin system for creating custom themes and snippets. It also serves as a Markdown preview editor, providing side-by-side visual rendering for content authoring. The platform includes capabilities for large project navigation, code autocompletion, and workspace-wide search and replace. These tools are supplemented by integrated version control and the ability to manage interface themes.

Macdown is a markdown text editor and HTML renderer designed for structured document composition. It provides a workspace for writing in lightweight markup syntax while simultaneously generating a live HTML preview of the rendered output. The editor distinguishes itself through a programmable interface, offering a command line utility to open files or pipe text directly into the application. It further supports extensibility via a plugin system that allows for the addition of custom features and functional modules at runtime. The application handles technical documentation requirements including mathematical notation, syntax-highlighted code blocks, and the visualization of Graphviz and Mermaid diagrams. It also supports exporting content as responsive HTML and monitors the file system to synchronize changes made by external editors.

react-syntax-highlighter is a React component that renders source code with language-specific syntax coloring. It wraps the Prism and Highlight.js syntax highlighting libraries, tokenizing source code using their language grammars and mapping each token to a styled React element. The component operates in two styling modes: inline style objects applied directly to each token, or CSS class names that can be themed via external stylesheets. This dual-mode approach makes the highlighter portable across environments where CSS class injection may or may not be available. The component is built around a pluggable architecture where interchangeable highlighter engines feed a tokenization pipeline, and the resulting tokens are wrapped in nested React elements to preserve line and token structure. Developers can apply custom color themes and select from dozens of language grammars, enabling consistent branding or accessibility requirements in React-based documentation, blogs, and tutorials. The rendering is entirely virtual DOM-based, converting parsed tokens into styled elements without requiring external DOM manipulation or dependencies beyond the core highlighter libraries. The project covers the full workflow of syntax highlighting in React: parsing source code, tokenization, and styled rendering, all exposed through a straightforward component API. Documentation and installation instructions are available in the repository, guiding users through adding the package and using either the default themes or custom ones.

Silver Bullet is a local-first, bidirectional Markdown wiki that functions as a Lua-scriptable note-taking platform with an embedded declarative query language. It treats a single folder on your device as the root workspace, monitoring that directory for file changes via a native file-system watcher to keep its in-memory index and user interface synchronised in near real-time. Notes are parsed into a live-preview Markdown AST that re-renders only changed nodes as you type, and the application builds a directed graph of internal hyperlinks from each note’s content to support bidirectional navigation and structured graph queries. What distinguishes Silver Bullet is its combination of a Lua scripting sandbox and a plugin extensibility model, which together allow users to generate dynamic content, define custom commands, and build widgets that modify how the workspace behaves. A query engine evaluates a custom query language against note metadata and content, returning filtered and sorted results that can be rendered through user-crafted templates—enabling auto‑updating lists or pages driven by tags and structured attributes. This makes the tool extendable far beyond basic note-taking, letting users script their own workflows and data transformations inside the same local environment. The platform also provides the expected knowledge-management conveniences: bi‑directed link display that surfaces both inbound and outbound connections, modal pickers for fast page/command/tag navigation, full‑text search across the workspace, hierarchical outlines, and checkbox‑based task tracking within Markdown documents. All content is edited in Markdown with live preview, slash commands, and autocomplete, and the embedded structured-data query language allows users to retrieve and aggregate information from across their linked notes.

Highlight.js is a syntax highlighting library that automatically detects and applies color-coded styling to source code blocks within web pages. It functions as a language-agnostic formatting engine, utilizing a modular processor that applies consistent visual themes to diverse programming languages based on their specific grammatical rules. By decoupling the core parsing logic from language-specific definitions, the library provides a unified execution environment that operates without requiring internal knowledge of the target language. The project is distinguished by its modular architecture, which allows developers to import only the specific language definitions required for their application, effectively minimizing bundle sizes. It employs a state-machine tokenizer to process raw text through nested states, enabling the accurate identification of complex language structures. Because the engine is platform-agnostic, it can be executed in both browser and server environments, delegating visual presentation to external stylesheets through generic CSS classes. The library supports a wide range of integration strategies, including server-side rendering for consistent content delivery and client-side processing for dynamic updates. It offers performance-focused features such as web worker support to offload heavy processing tasks, ensuring that user interfaces remain responsive. Furthermore, the library provides compatibility with both modern and legacy module standards, along with plugins for common component-based frameworks to facilitate integration into existing application lifecycles.

highlight.js is a JavaScript syntax highlighter and client-side code formatter that transforms plain text source code into highlighted HTML for web display. It provides syntax highlighting across a wide variety of programming languages. The library includes an automatic language detector that identifies the programming language of a code block to apply the correct highlighting rules without manual tagging. It is designed for web worker compatibility, allowing the highlighting process to run in background threads to prevent the browser interface from freezing during the processing of large volumes of code. This zero-dependency runtime handles both automatic and manual language specification to format source code directly in the browser.