massCode

COLLECTIVE

A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.

This is massCode's page massCode

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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

Latest activity by

+ 12

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

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Be the first one to contribute!

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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

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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

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Donation

Make a custom one-time or recurring contribution.

Latest activity by

+ 68

Top financial contributors

Individuals

$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

kRyTiCaL

$25 USD since Sep 2022

MichaelF

$25 USD since Jul 2026

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

Budget

Transparent and open finances.

Financial contribution to massCode

Credit from Bencodesall to massCode • September 16, 2026

+$20.00USD

Completed

Contribution #980031

Development April - August 2026

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News from massCode

Updates on our activities and progress.

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

massCode v4 is here 🚀

We’re excited to announce the release of massCode v4 — a major milestone that brings a brand-new foundation, improved performance, and a powerful set of tools for developers. This version is not just an update — the app has...

Published on September 28, 2025 by Anton Reshetov

About

About

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.

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.

Editor, Live Preview, and Preview modes
Integrated Mermaid diagrams
Mind maps generated from markdown heading structure
Fullscreen presentation mode for demos and meetings
Callout blocks and image embedding

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)

Developer Tools

Built-in utilities for the small tasks that usually send you to a browser tab:

Text: Case Converter, Slug Generator, URL Parser
Crypto: Hash/HMAC Generator, Password Generator, UUID
Encoders: URL, Base64, JSON to TOML/XML/YAML, Color Converter
Generators: JSON Generator, Lorem Ipsum

Markdown Vault

Your snippets and notes 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