Propagation Simulator is an educational propagation-simulator running entirely in the web browser, without the need of any back-end software. It features interactive 3D modeling to help aspiring operators visualize and comprehend how signals bounce through the ionosphere. By adjusting power, frequency bands, and time, users get an intuitive, visual look at atmospheric radio wave behavior without the complexity of advanced forecasting software.

No heavy system requirements, just a modern browser (Chromium compatible, like Chrome, Edge, Firefox, Safari)

No installations required. If you want a local copy, just download the standalone version.

Released under the GNU General Public License v3.0.

Try it now:
https://lb5sh.no/wp-content/uploads/2026/11/propagation-simulator-standalone.html

GitHub repo:
https://github.com/skurk/propagation-simulator