A free, no-signup instrument for understanding how trading actually works — from buying a share to running an iron condor. Every concept is a dial you move while the picture responds. It is deliberately not a brokerage: it connects to nothing, executes nothing, and sells nothing. Crashes in here are free.

Where the numbers come from. The six hangar securities — COSMOS through PULSAR — are fictional. Their histories, chains, and volatility surfaces are generated by our own engine to behave like six recognizable market personalities (a sleepy index fund, a binary-event biotech…), so nothing here is anyone's market data and nothing is ever stale. All interactive math is computed in your browser by our own Black-Scholes-Merton engine. Honest idealizations: US equity options are American-style while the model is European; entries assume mid fills; "win odds" assume prices wander randomly at current implied volatility.

Want a real security? Exchanges license the display of real quotes, so we can't publish them — but you are allowed to look them up yourself. Use the + data chip to build a security from numbers off your broker's screen, or upload the CSV you download manually from Cboe's delayed-quotes page. Either way it lives only in your browser; we never see it.

Why profit is blue. About 1 in 12 men can't reliably tell red from green — the exact pair finance defaults to. Profit/loss here is a blue↔red pairing validated for common color-vision deficiencies, and meaning is never carried by color alone.

Open source. The whole instrument — the pricing engine and its tests, the fictional-market generator, every chart — is MIT-licensed at github.com/abhishekpradhan/optionaut. Read it, fork it, or file an issue when something bites the wrong way.

Free, forever. No ads, no accounts, no upsell — Optionaut costs a domain name and some coffee. If it saved you from a real-money mistake, you can buy me a coffee. Entirely optional; the instrument flies the same either way.

The fine print, plainly. Options involve a high degree of risk and are not suitable for all investors. Optionaut is not an investment advisor, broker, or dealer. Nothing here is investment advice, a recommendation, or a solicitation to buy or sell any security. The strategies shown can and do lose money — several exist to demonstrate exactly how. Before trading for real, read your broker's Characteristics and Risks of Standardized Options and assume real fills are worse than model fills.