Available now
Pivotal altitude
Eights on pylons. Work out the altitude your groundspeed puts you at, and how far it moves between upwind and downwind.
Flight envelope
The V-g diagram and glide polar for your aeroplane at your weight. Watch manoeuvring speed drop as you get lighter — it goes the way most people do not expect.
XC requirements planner
Plan the cross-countries your certificate or rating actually requires — distance, landings, solo or dual — from your home field.
Why these are free
Cost to serve is the line, and it doesn't move with traffic.
Nothing on this page calls a language model or a metered API. Running it for one pilot and running it for ten thousand cost us the same, which is roughly nothing — so a signup wall in front of it would exist only to harvest an address. Share them, put them in a syllabus, hand them to a student. That is what they are for.
The other half
These stay free. The rest is what we actually built.
A go/no-go brief against your own minimums, and someone watching the flight while you fly it.
Free while we're in beta. No card.