massCode
Fiscal Host: Open Source Collective
A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.
Contribute
Become a financial contributor.
Financial Contributions
Recurring contribution
Supporter
Help keep massCode free and independent. Your monthly contribution funds development, bug fixes, and maintenance. Contributors can request a suppor... Read more
Starts at
$5 USD / month
Recurring contribution
Core Supporter
Give more to support ongoing massCode development, bug fixes, and maintenance. Includes the same supporter recognition, with a larger contribution ... Read more
$15 USD / month
Recurring contribution
Sponsor
Support massCode as an organization and help fund ongoing development. Get your logo and a link to your website in the sponsors section on masscode... Read more
Starts at
$50 USD / month
Recurring contribution
Gold Sponsor
Support independent open-source development as an organization. Get your logo and link in a dedicated Gold Sponsors section above other sponsors on... Read more
$150 USD / month
Top financial contributors
Individuals
1
$600 USD since Apr 2021
Incognito
$240 USD since Oct 2022
Zhongdong Yang
$190 USD since Aug 2022
poa00
$99 USD since Feb 2024
Mariusz
$75 USD since Feb 2024
Adrian
$62 USD since Nov 2022
Lawrence
$52 USD since Jul 2022
Incognito
$50 USD since Aug 2022
JWiede
$50 USD since Jul 2026
Kenji Sato
$42 USD since Dec 2024
Fabian
$34 USD since Jul 2022
12
kRyTiCaL
$25 USD since Sep 2022
13
MichaelF
$25 USD since Jul 2026
14
casual
$22 USD since May 2022
Zafer BAHADIR
$20 USD since Aug 2021
Organizations
THANKS.DEV
$503.48 USD since Apr 2025
massCode is all of us
Our contributors 73
Thank you for supporting massCode.
Anton Reshetov
Admin
$600 USD
THANKS.DEV
$503 USD
Incognito
Supporter
$240 USD
Zhongdong Yang
Supporter
$190 USD
poa00
Supporter
$99 USD
Mariusz
Supporter
$75 USD
Adrian
Supporter
$62 USD
Lawrence
Supporter
$52 USD
Incognito
$50 USD
JWiede
$50 USD
Kenji Sato
Supporter
$42 USD
Fabian
Supporter
$34 USD
kRyTiCaL
$25 USD
Budget
Transparent and open finances.
+$2.00USD
Completed
Contribution #976206
+$2.00USD
Completed
Contribution #969963
Credit from Bencodesall to massCode •
+$20.00USD
Completed
Contribution #980031
$
Today’s balance$25.85 USD
Total raised
$2,091.33 USD
Total disbursed
$2,065.48 USD
Estimated annual budget
$649.74 USD
Connect
Let’s get the ball rolling!
News from massCode
Updates on our activities and progress.
massCode v6 is here!
massCode v6: AI assistant, MCP, and faster everyday workmassCode v6 brings a built-in AI assistant, connections to external coding agents, and performance improvements for larger libraries....
Published on September 27, 2026 by Anton Reshetov
Supporter license
Supporter license keys are here massCode v5.6 replaces the separate supporter build with supporter license keys. If you support massCode, you can get a license key that unlocks supporter status in the standard app and removes the "Unsponsor...
Published on June 12, 2026 by Anton Reshetov
massCode v5 is here 🚀
Originally a snippet manager, massCode now brings together snippets, notes, calculations, and developer tools in one desktop app, so everyday work stays in one place. Markdown VaultmassCode no longer uses SQLite for data st...
Published on March 31, 2026 by Anton Reshetov
About
About
Originally a snippet manager, massCode now brings together snippets, notes, HTTP requests, calculations, drawings, and developer tools in one desktop app, so everyday work stays in one place.
Features
Code Snippets
Use massCode as a focused snippet workspace with multi-level folders, tags, and fragments for organizing reusable code across projects and languages.
- 160+ syntax grammars out of the box (600+ supported via .tmLanguage)
- Integrated Prettier for code formatting
- Real-time HTML & CSS preview for quick prototyping
- JSON Visualizer for exploring nested structures as interactive graphs
- Export snippets as polished images with customizable themes
Notes
Write longer markdown documents right next to your snippets: project docs, drafts, research notes, and personal knowledge bases.
- Task notes with status, priority, due dates, and Today / Upcoming / Completed views
- Completed task cleanup and auto-clean scheduling
- Dashboard with activity overview, recent notes, top linked notes, and a notes graph preview
- Editor, Live Preview, and Preview modes
- Editable markdown tables with row and column controls
- Internal links to notes, snippets, and HTTP requests, with placeholders for items you plan to create later
- Note inspector with section navigation and reordering, link filters, and grouped callouts
- Fullscreen notes graph for exploring internal links between notes
- Integrated Mermaid diagrams
- Mind maps generated from markdown heading structure
- Fullscreen presentation mode for demos and meetings
- Callout blocks, including TODOs for unfinished writing, and image embedding
HTTP Client
Build and test API workflows alongside your code snippets and project notes.
- Send HTTP and GraphQL requests and exchange WebSocket messages
- Organize collections and nested folders with shared auth, headers, variables, and scripts
- Switch environments, protect tokens with local secret variables, and pass response values between requests
- Check responses with assertions and JavaScript tests, then run collections or folders in sequence
- Edit query parameters, headers, authentication, and JSON, text, form, or file payloads
- Generate request code for 20 languages and runtimes, including cURL
- Inspect responses and saved history, debug traffic in Console, and manage cookies and transport settings
- Import collections from OpenAPI, Postman, and Bruno
See the HTTP documentation to get started.
Math Notebook
A calculator-style notebook for natural-language calculations, conversions, and date math without leaving your workflow.
- Arithmetic, percentages, unit conversions, and date/time math
- 166+ fiat currencies, 21 cryptocurrencies with live exchange rates
- Variables, functions, and aggregates for quick iterative calculations
- Finance calculations (compound interest, ROI, loan repayment)
Drawings
Sketch diagrams, wireframes, and whiteboard ideas on an Excalidraw-powered canvas next to your snippets and notes.
- Searchable list of drawings with keyboard navigation
- Pan and zoom remembered per drawing, with fit-to-content to recenter
- Export drawings as images
- Embed drawings directly in your markdown notes
Developer Tools
Built-in utilities for the small tasks that usually send you to a browser tab:
- Compare: JSON Diff
- Text: Case Converter, Slug Generator, URL Parser, Line Break Normalizer
- Crypto: Hash/HMAC Generator, Password Generator, UUID
- Encoders: URL, Base64, JSON to TOML/XML/YAML, Color Converter
- Generators: JSON Generator, Lorem Ipsum
Command Palette
Jump to spaces, snippets, notes, HTTP requests, and common actions from anywhere with a keyboard-first command palette.
- Open with Cmd+P on macOS or Ctrl+P on Windows and Linux
- Search across snippets, notes, HTTP requests, spaces, and commands
- Run create actions for snippets, notes, HTTP requests, and folders
- Scope search to a space with @ or open command mode with >
Imports
Bring existing work into your vault with preview-first imports for snippets, notes, and API collections.
- Import snippets from VS Code, Raycast, SnippetsLab, and public GitHub Gists
- Import markdown notes from Obsidian folders
- Import HTTP collections from OpenAPI, Postman, and Bruno
- Review detected items, folders, tags, environments, and warnings before writing anything
Browser Clipper
Save web content from Chrome, Firefox, or Safari into the local massCode app.
- Install the Chrome version from the Chrome Web Store
- Save selected code as snippets
- Save selected text or readable page content as notes
- Save pages or links as HTTP GET requests
- Connect through the local Integration API with an API token
AI Assistant
Ask the built-in assistant to carry out tasks across Code, Notes, and HTTP using your own AI provider account or a local model.
- Edit and format snippets, organize notes, and update tasks
- Find records across your vault and use them in a conversation
- Run HTTP collections with confirmation, explain failed checks, and save reports in Notes
- Request a preview before edits, adjust a task while it runs, and undo changes that support Undo
Cloud providers receive the context used for the task; use a model running on your computer for local processing. See the AI Assistant guide for setup and examples.
MCP Integration
Connect Codex, Claude Code, Cursor, or VS Code Copilot to your massCode vault through the built-in MCP server.
- Find and read snippets, notes, and saved HTTP requests from your coding agent
- Save code and Markdown notes to Inbox; organize HTTP requests in Inbox or collections
- Edit and move saved HTTP requests with protection against overwriting newer changes
- Preview and send requests using the active massCode environment, then inspect saved execution history
See the MCP setup guide to connect your agent.
Markdown Vault
Your snippets, notes, and HTTP requests live as plain .md files on disk with frontmatter metadata, so the data stays readable and portable.
- Git-friendly - track changes and sync via any Git remote
- Cloud sync - works with iCloud, Dropbox, Google Drive, Syncthing
- Live sync - massCode watches the vault and picks up external changes in real time
- No vendor lock-in - your data is always yours
Custom Themes
Customize the app UI and editor syntax highlighting with JSON theme files. Supports light and dark themes with live reload. See the theme docs.
Our team
Anton Reshetov
Admin
