Observed arrival · 2026-09-24
Vivapse: program a rocket, then let the physics answer
A browser-based rocket and orbital flight simulator where you design a vehicle and write the JavaScript flight program that flies it.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- People learning orbital mechanics through flight programming
- Worth noticing
- The page lists 940 passing tests and three physics audits that document where the simulation departs from reality.
Field notes
A flight program reads telemetry such as dynamic pressure and remaining propellant, then issues throttle, steering and staging commands; the page says no autopilot catches mistakes. Its stated model includes WGS84/J2 gravity, live weather over a selected launch site and named lunar and planetary ephemerides. The homepage also lists 940 passing tests and links to audits describing the model's limits.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue