# jmoenig/Snap

a visual programming language inspired by Scratch

Repository: https://github.com/jmoenig/Snap
Canonical: https://ross.abutalabs.com/products/jmoenig-snap
Homepage: http://snap.berkeley.edu
Language: JavaScript
License: AGPL-3.0
License Family: copyleft
Topics: snap, programming-language, visual, bjc, byob, cs10, apcsp, blocks
Last push: 2026-08-26T14:16:08+00:00

## Health v2 (maintenance only)
Score: 91/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 75, longevity 100
- inputs: {"age_days": 4918, "days_push": 7, "days_rel": 86, "gap_med": 2, "n_releases_24m": 62}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1610, forks 820 (observed 2026-08-28T04:05:10.897553+00:00)

## What it is
Snap! is a visual, blocks-based programming language and IDE inspired by Scratch, written in JavaScript and runnable in the browser. It supports building your own blocks (first-class functions) and is designed for both beginners and serious computer science study.

## Use cases
- teach kids to program with drag-and-drop blocks
- learn computer science concepts like recursion and higher-order functions visually
- build games and animations without writing text code
- run an AP CS Principles or BJC course curriculum
- extend the IDE with JavaScript extensions
- run Snap! offline as a progressive web app

## When to choose
- you want a Scratch-like language with more advanced features such as first-class procedures and custom block definitions
- you need a browser-based IDE with no installation for classroom use
- you teach introductory CS or AP CSP and want a free, open-source tool

## When to avoid
- you need a text-based programming language for production software development
- you require high performance or native mobile apps
- you want a Scratch-compatible environment with the exact Scratch block set and community

## Facets
- artifact type: application
- maturity: active
- function: programming-language, interpreter, gui
- domain: education, programming-languages, web-development
- platform: browser, cross-platform
- tags: visual-programming, blocks-based, scratch-inspired, ide, javascript, cs-education, education, web-server

## Member repositories
- jmoenig/Snap (main) score 91

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:10.897553+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:51:14.605832+00:00, confidence not recorded.
  - readme: https://github.com/jmoenig/Snap (fetched 2026-08-28T04:05:10.897553+00:00, sha eff23ae7c80f)
  - homepage: http://snap.berkeley.edu (fetched 2026-08-29T11:23:37.052649+00:00, sha 6d4b99cd0096)
- Data as of 2026-08-30T08:39:29.467469+00:00.