Project APEX is a free, browser-based flight simulator for high power rocketry. It exists because we needed it ourselves — and decided to build it right.
Project APEX grew out of a simple frustration: existing HPR simulation tools are either too expensive, too complex to set up, or locked behind a desktop install. When you’re at the range trying to decide whether to swap motors before a flight, you don’t want to open a laptop and wait for software to load.
So Conrad Mouton at 434 Aerospace built something different — a professional-grade physics simulation that runs entirely in the browser. No install. No account. Open the link, load your motor, get your answer.
434 Aerospace is Conrad Mouton’s aerospace engineering practice, focused on high power rocketry design, analysis, and certification support. Project APEX is 434 Aerospace’s open contribution to the HPR community — free to use, free to inspect, and built to grow with input from the people who fly.
Every release of Project APEX is signed with an HMAC-SHA256 fingerprint that uniquely identifies the canonical 434 Aerospace build. Press Shift+Alt+V inside the simulator at any time to verify authenticity using the master passphrase. The passphrase is never stored in the app — only its fingerprint is embedded.
