# openrocket/openrocket

Model-rocketry aerodynamics and trajectory simulation software

Repository: https://github.com/openrocket/openrocket
Canonical: https://ross.abutalabs.com/products/openrocket
Homepage: https://openrocket.info/
Language: Java
License: NOASSERTION
License Family: other
Topics: aerospace, flight-simulator, java, modeling, optimization, rocket, rocketry, simulation, trajectory
Last push: 2026-08-26T11:39:30+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 8, longevity 100
- inputs: {"age_days": 5086, "days_push": 7, "days_rel": 402, "gap_med": null, "n_releases_24m": 1}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3065, forks 692 (observed 2026-08-28T04:07:41.316094+00:00)

## What it is
OpenRocket is a free, open-source model rocket simulator written in Java for designing and simulating rockets before building and flying them. It offers six-degree-of-freedom flight simulation, 2D/3D design views, real-time performance feedback, and automatic design optimization.

## Use cases
- design a model rocket and simulate its flight trajectory
- predict maximum altitude and velocity of a hobby rocket
- optimize rocket fin and motor parameters for a flight goal
- check rocket stability with center of pressure vs center of gravity
- simulate multi-stage and clustered motor rockets
- export rocket designs to RockSim, RASAero II, or OBJ for 3D printing
- plot and export simulation data to CSV for analysis

## When to choose
- you design hobby or competition model rockets and want free simulation software
- you need cross-platform rocketry simulation with staging, clustering, and wind modeling
- you want automatic design optimization and real-time CG/CP feedback
- you need to export designs to other rocketry tools or 3D-printable formats

## When to avoid
- you need CFD-grade or supersonic aerodynamic analysis
- you require professional aerospace trajectory tools for orbital or full-scale launch vehicles
- you need a lightweight library to embed simulation in your own app rather than a desktop GUI

## Facets
- artifact type: application
- maturity: active
- function: simulation, data-visualization, gui
- domain: simulation, graphics, education
- platform: cross-platform, jvm, windows
- tags: model-rocketry, aerodynamics, trajectory-simulation, rocket-design, flight-simulation, java, optimization, aerospace, desktop, macos, linux

## Member repositories
- openrocket/openrocket (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:41.316094+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 2026-08-30T07:28:17.309878+00:00, confidence not recorded.
  - readme: https://github.com/openrocket/openrocket (fetched 2026-08-28T04:07:41.316094+00:00, sha da6fa02585a1)
  - homepage: https://openrocket.info/ (fetched 2026-08-29T09:43:32.443626+00:00, sha 9d5b16644607)
  - site_page: https://openrocket.info/features.html (fetched 2026-08-29T09:43:32.452860+00:00, sha 1974a0700c61)
  - site_page: https://openrocket.info/documentation.html (fetched 2026-08-29T09:43:32.454663+00:00, sha 666e1af61b50)
- Data as of 2026-08-30T08:39:29.467469+00:00.