# ncase/loopy

A tool for thinking in systems

Repository: https://github.com/ncase/loopy
Canonical: https://ross.abutalabs.com/products/ncase-loopy
Homepage: http://ncase.me/loopy/
Language: JavaScript
License: CC0-1.0
License Family: permissive
Last push: 2024-07-08T08:50:23+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3473, "days_push": 786, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1743, forks 243 (observed 2026-08-28T04:05:30.428469+00:00)

## What it is
LOOPY is a browser-based tool for modeling and simulating systems by drawing circles and arrows (causal loop diagrams). It lets users play with interactive simulations to build intuition about complex systems, and remix or share others' models.

## Use cases
- model a system by drawing circles and arrows
- simulate causal loop diagrams interactively
- ask what-if questions about a system's behavior
- teach systems thinking in a classroom
- remix and share other people's system models
- build intuition for feedback loops without coding

## When to choose
- you want a no-code, drawing-based way to explore feedback loops and system dynamics
- you're an educator introducing systems thinking interactively
- you want a public-domain tool you can freely reuse or remix
- you want to share and remix simulations via a simple web page

## When to avoid
- you need rigorous quantitative system dynamics modeling with precise equations
- you need offline desktop simulation software
- you need large-scale or data-driven simulation beyond simple causal diagrams

## Facets
- artifact type: application
- maturity: maintenance
- function: simulation, data-visualization
- domain: simulation, education, data-visualization, developer-tools
- platform: browser
- tags: causal-loop-diagrams, systems-thinking, drawing-tool, interactive-simulation, public-domain, education, web-server

## Member repositories
- ncase/loopy (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:30.428469+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 2026-08-30T03:29:33.903913+00:00, confidence not recorded.
  - readme: https://github.com/ncase/loopy (fetched 2026-08-28T04:05:30.428469+00:00, sha 0e722d9ea0b9)
  - homepage: http://ncase.me/loopy/ (fetched 2026-08-29T11:07:32.044865+00:00, sha beffc41ee54e)
- Data as of 2026-08-30T08:39:29.467469+00:00.