Use the form inputs (Seed, Star Count, Spiral Arms, Spread, Twist) on the left to customize your galaxy.
Once you’ve set them, click New Galaxy to regenerate.
Show Star Catalog:
Toggle the table of all stars with the SHOW STAR CATALOG button.
Show Planet Data:
After selecting a star, click SHOW PLANET DATA to view its planets; click again to hide.
Show System Map:
After selecting a star, click SHOW SYSTEM MAP to see its planetary orbits in a separate view; click again to hide.
Export:
Use EXPORT CSV or EXPORT XLSX to download all star & planet data (and your current settings sheet in the XLSX).
🗺️ Map Navigation Instructions
Move the Map:
Use the arrow keys (←↑↓→) on your keyboard to pan the map
left, up, down, and right.
Zoom In / Out:
Press the + key to zoom in and the – key to zoom out.
Center the Map:
Click anywhere on the map to center the view on that location, or use the Center Map button to reset.
About Galaxy Cartographer
Galaxy Cartographer began as a procrastination project.
Faced with the overwhelming task of writing my epic space opera, I did what any sensible, would-be author would do:
I built a procedural galaxy generator instead.
What started as a way to avoid naming a few planets spiraled into a full-blown visualization engine for spiral arms,
star types, planetary distributions, and naming schemes that would make a Roman archivist weep.
Galaxy Cartographer isn't just a toy. It’s a creative tool for authors, game masters, worldbuilders,
and science fiction obsessives who want just enough logic behind their lore.
You can generate thousands of stars, filter by spectral type, inspect planetary systems, export CSVs and Excel files,
and name planets with ordinal Latin flair.
Galaxy Cartographer uses seeded randomness, so you can regenerate the
same galaxy again and again. Or, tweak the parameters until you discover the perfect setting for your next chapter, campaign,
or fever dream.
Galaxy Cartographer doesn't write the story for you. But it will make sure the stars are aligned when
you're finally ready to.
Thank you for checking it out.
Feel free to use it for any project, commercial, or otherwise. See the terms in the nav bar.
Solis Supra Omnia!
-Tony
End User License Agreement (EULA)
Last Updated: July 25, 2025
1. Introduction
Welcome to Galaxy Cartographer (the “App”) provided by Tony Geiser (“we,” “us,” or “Licensor”). By using or downloading the App from galaxycartographer.com, you (“you” or “Licensee”) agree to be bound by this End User License Agreement (“EULA”). If you do not agree, do not use the App.
2. License Grant
We hereby grant you a non-exclusive, worldwide, royalty-free license to install, use, reproduce, and distribute the App and its documentation for personal or commercial purposes, subject to the terms of this EULA.
3. Revocation of License
This license is revocable at our sole discretion. We may suspend or terminate your license at any time, for any reason, with or without notice. Upon revocation, you must immediately cease all use of the App and delete all copies in your possession.
4. User Obligations
You shall not modify, reverse engineer, decompile, or disassemble the App except as permitted by law.
You shall not sublicense, rent, lease, or otherwise transfer rights to the App to any third party.
You shall comply with all applicable laws in your use of the App.
5. Intellectual Property
All title, ownership rights, and intellectual property rights in and to the App remain with Tony Geiser. The App is protected by copyright and other intellectual property laws.
6. Disclaimer of Warranties
THE APP IS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. YOUR USE IS AT YOUR SOLE RISK.
7. Limitation of Liability
IN NO EVENT SHALL THE LICENSOR BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES ARISING OUT OF OR RELATED TO YOUR USE OF THE APP, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
8. Governing Law
This EULA shall be governed by and construed in accordance with the laws of the State of [Your State/Country], without regard to its conflict of law principles.
9. Contact Information
For questions about this EULA, please contact: Tony Geiser
LinkedIn Profile
Contact
If you'd like to connect, collaborate, or just talk military sci-fi, I'm easy to find...
Substack:
Sol Defense Corps
— where I post articles, theories, and spacefaring satire.
X (formerly Twitter):
@TonyGeiser
— for hot takes, sci-fi chatter, and occasional rants about exo-politics.
LinkedIn:
Tony Geiser
— professional background, project updates, and networking.
Feel free to reach out through any of the above. I’m always up for a good debate about power armor specs or the ethics of orbital bombardment.