galpy

The premium Open Source alternative to NEMO Toolbox

🎯 Best for:Modeling stellar orbits and galactic potentials in the Gaia era.
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0.3k
Stars
BSD-3-ClauseLicense

What is galpy?

Calculates orbits and potential models for stars within the Milky Way and other galaxies. Supports integration of various gravitational potentials and action-angle coordinate transformations.

Tech Stack
PythonPhysics & Astronomy

Why galpy?

  • Fast C-based integration
  • Comprehensive potential library
  • Excellent documentation

Limitations

  • N-body support is limited
  • Complex coordinate systems
  • Requires strong dynamics background
3/2/2026
Last Update
112
Forks
4
Issues
BSD-3-Clause
License
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Competitor Cost
-$1,440
/ year (est. based on NEMO Toolbox)
Self-Hosted
$0
/ year
Team Size10 Users
150+
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