Flexagon

Fold a hard idea over until you can see it.

Hands-on tools that turn intimidating calculations into something you can feel — drag a slider, watch the curve answer. Bonds, rates, and options today, with more on the way. No sign-in, nothing leaves your device.

Bond rate & convexity playground

Move market yields and watch a bond's price ride the curve — duration is the straight line, convexity is the gap.

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Treasury curve & portfolio builder

Shape an allocation across the real Treasury curve and see blended yield, duration, and rate sensitivity move with it.

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Black-Scholes, visually

See an option's value bend above its payoff, then overlay the Greeks to watch where each one peaks.

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Second-order Greeks

Watch delta or vega shift as volatility or time changes — the gap between the curves is vanna, charm, vomma, veta.

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