Pricing
Every design tool is free. Heavy aerodynamic compute runs on pay-as-you-go credits — no subscription, and credits never expire.
Free — for everyone
Always free
- ✓Search 1,600+ airfoils with CST parameters
- ✓Wind-tunnel-grade polar database & comparison charts
- ✓Mission-based airfoil selector
- ✓Interactive CST / Kulfan airfoil designer
- ✓3D wing geometry generator
- ✓DXF export for CAD & CNC
- ✓Public REST API (rate-limited)
- ✓2D polar analysis (NeuralFoil, rate-limited)
Free every month
with a free account
- 3 airfoil optimizationsIPOPT gradient optimizer
- 10 wing-analysis creditsAeroBuildup or VLM, any fidelity
Free runs are per person and per browser, not per account; credits are per account.
No account yet? You get 3 free analyses to try it out.
Credit packs — pay as you go
Purchases available in the US at launch — more regions soon. The free tier works everywhere. Prices in USD; sales tax calculated at checkout.
What compute costs
2D polar analysis
NeuralFoil neural-network aerodynamics — rate-limited, 120/hour
Free
Airfoil optimization
IPOPT gradient-based shape optimizer
3 credits
Wing analysis — AeroBuildup
Fast strip-theory estimate
1 credit
Wing analysis — VLM
Vortex-lattice method — cost scales with mesh fidelity (spanwise panels)
Aircraft trim & static margin
Wing + stabiliser about a CG on a lifting line — paid-only, no free allowance. The closed-form estimate on /trim and /wing is free.
2 credits a trim point
3 a speed sweep
APIs & AI agents — same credits, no extra tier
Developer REST API
free · read-only · API key optional
Browse the airfoil library, polars, and DAT geometry programmatically. An API key is optional: without one it is rate-limited to 40 requests/hour per IP; a free key raises that to 600/hour.
Generate an API key in Dashboard → API Keys · Read the API docs →
MCP server for AI agents
free account required · 600 requests/hour
Connect Claude or any MCP client and let an agent run the whole loop — search, analyze, optimize, wing analysis. Every call needs a free API key or a connector sign-in. Only optimize_airfoil, analyze_wing and analyze_trim spend credits, at the same rates as the web app; analyze_airfoil, find_airfoil and the library tools never do. An agent can even top up its balance mid-session.
Generate an API key in Dashboard → API Keys · connection guide
Questions
Do credits expire?
No. Credits never expire — buy a pack once and spend it whenever you need it.
Where do credits work?
Everywhere: the web app, the developer API, and the MCP server for AI agents share one balance.
When are credits spent?
Only after your free monthly allowance is used up. The free allowance resets every month and never costs anything.
Who can buy credits?
Purchases are available in the US at launch and rolling out to more regions. The free tier is available everywhere.
What about taxes and refunds?
Prices are in USD; applicable sales tax is calculated at checkout. See the Refund & Payments Policy.