massCode icon
massCode icon

massCode

 19 likes

Free, open-source developer workspace for code snippets, Markdown notes, HTTP requests, calculations, drawings, and developer tools.

Code snippets organized with folders, tags, and syntax highlighting

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  • Mac
  • Windows
  • Electron
  • Ubuntu
  • Linux
Markdown notes with formatted documents and checklists
HTTP client with collections, environments, and request previews
+1
Draw diagrams and wireframes on an Excalidraw-powered canvas
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Development, Office & Productivity, OS & Utilities

GitHub repository

  •  7,064 Stars
  •  277 Forks
  •  1 Open Issues
  •   Updated  
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Our users have written 2 comments and reviews about massCode, and it has gotten 19 likes

massCode was added to AlternativeTo by David on and this page was last updated .

Comments and Reviews

   
Top Positive Comment
badrelmers
0

uses the same code editor of vscode (monaco editor), so it is perfect as a note taker for programmers

RemovedUser
0

Loved the integrated code formatter (it's using Prettify). A snippet can have multiple languages (called "fragments"). Support for tags. Uncluttered interface.

Review from a new or low-activity account — shown here, but not counted in the app rating.

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Install from the command line

  • winget install -e --id antonreshetov.massCode
  • brew install --cask masscode

Be careful what you paste into a terminal. Check what a command installs before running it.

What is massCode?

massCode is a free, open-source desktop workspace for developers, available for macOS, Windows, and Linux. Originally a code snippet manager, it now brings reusable code, technical notes, API requests, calculations, and drawings together in one app.

Organize snippets with nested folders, tags, and multiple fragments. Use syntax highlighting, integrated Prettier formatting, HTML and CSS previews, and a JSON visualizer.

Write Markdown notes with live preview, internal links, Mermaid diagrams, mind maps, and presentation mode. Snippets and notes are stored locally in a Markdown vault that you control.

The built-in HTTP client supports HTTP and GraphQL requests, WebSocket messages, collections, environments, response assertions, and JavaScript tests. Import API collections from OpenAPI, Postman, and Bruno.

A math notebook handles calculations and unit conversions, while an Excalidraw-powered drawing space supports diagrams and wireframes. Developer utilities include JSON Diff, encoders, converters, and generators.

massCode works without an account and provides offline access to local snippets and notes. It is released under the AGPL-3.0 license.