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Free, no account. The pro options toolkit others charge for — probability of profit, net Greeks, IV rank, scans and saved trades.

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Delayed market data · Black-Scholes on the Treasury curve · Built for phones too

CreditCreditDebitDebit$631$218$793$2,202

Max profitMax profitMax profitMax profit+$1,828+$218+$1,207Unlimited

Max lossMax lossMax lossMax loss−$77,171−$782−$793−$2,202

PoPPoPPoPPoP61%75%38%43%

Nov 13 · 30dBullishBull call spreadCovered callNeutralIron condorIron butterflyVolatileLong straddleLong strangle

PositionCovered CallIron CondorBull Call SpreadLong Straddle×1 · + Leg

Long−100+SPY shares

Stock@ 778.03

Sell−1+C790

Nov 13 · 30dfill 6.31

Buy−1+P735

Nov 13 · 30dfill 2.26

Sell−1+P745

Nov 13 · 30dfill 3.14

Sell−1+C805

Nov 13 · 30dfill 2.01

Buy−1+C815

Nov 13 · 30dfill 0.71

Buy−1+C780

Nov 13 · 30dfill 11.03

Sell−1+C800

Nov 13 · 30dfill 3.10

Buy−1+C780

Nov 13 · 30dfill 11.03

Buy−1+P780

Nov 13 · 30dfill 10.99

SPY · Covered Call · Nov 13 (30d) · +$631 creditSPY · Iron Condor · Nov 13 (30d) · +$218 creditSPY · Bull Call Spread · Nov 13 (30d) · $793 debitSPY · Long Straddle · Nov 13 (30d) · $2202 debitTodayExpiry

SPY 778.03±1σ $27.9−$6k−$4k−$2k$0$4k+$1,828C 790−$500−$250$0$500+$218−$782P 735P 745C 805C 815−$1.5k−$1.0k−$500$0$500$1.0k+$1,207−$793C 780C 800−$7.5k−$5.0k$0$2.5k$5.0k−$2,202P 780C 780720760800840

AnalysisSimplePro

You receive $631.You receive $218.You pay $793.You pay $2,202.Needs 100 shares (~$77,803). Profit if SPY is above $771.72 on Nov 13 (−0.8%).Profit if SPY stays between $742.82 and $807.18 on Nov 13 (−4.5% / +3.7%).Profit if SPY is above $787.93 on Nov 13 (+1.3%).Profit if SPY ends below $757.98 or above $802.02 on Nov 13.

Net creditNet creditNet debitNet debit$631$218$793$2,202

Prob. of profitProb. of profitProb. of profitProb. of profit61.1%74.5%38.2%43.1%

Max profitMax profitMax profitMax profit+$1,828+$218+$1,207Unlimited

Max lossMax lossMax lossMax loss−$77,171−$782−$793−$2,202

BreakevensBreakevensBreakevensBreakevens$771.72$742.82 · $807.18$787.93$757.98 · $802.02

ThetaThetaThetaTheta+$19/day+$7/day−$8/day−$37/day

Risk/rewardRisk/rewardRisk/rewardRisk/reward1:0.021:0.281:1.521:∞

Expected moveExpected moveExpected moveExpected move±$27.88±$27.88±$27.88±$27.88

Example tradeIllustrative SPY prices, not live quotesBlack-Scholes · r 4.10% · q 0.97% · IV 12.5% K Command

The workspace

One app for the whole trade

Build it, check it against the chain, scan for alternatives and keep an eye on it once it's on — every screen shares the same symbol, so nothing gets re-typed.

Build

Shape the trade, read the verdict

Step each strike to the next listed contract, start from presets for the trades people actually place, and read the result as one plain sentence. Switch ticker and the structure comes with you, with Undo.

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Chain

A dense chain with the vol picture beside it

Calls, strikes and puts in one table with a live spot line, every expiry with its DTE and expected move, and IV rank, skew and term structure in the side panel.

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Positions

A morning check that flags what needs you

Saved trades marked to the market with P/L, theta and days left. Rules surface take-profit, 21-DTE, tested-strike and ex-dividend moments, and browser alerts watch the rest.

Open Positions

Scan

Ranked ideas for your outlook

Pick a symbol and a view. Scan screens every leg for liquidity, then ranks spreads, condors and cash-secured puts by return, probability or risk/reward — each one opens in Build.

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Probability of profit
Risk-neutral, with a skew correction at each breakeven, on every trade.
Net Greeks
Delta, gamma, theta, vega and rho for the whole position, in dollars.
IV rank & percentile
Where today's at-the-money IV sits in its one-year range.
Scans
Ranked spreads, condors and cash-secured puts, screened for liquidity.
Saved trades & alerts
Positions marked to market, with browser alerts. Kept on your device.

Learn

A guide for every strategy

41 strategies, each with its payoff, max profit and loss, a worked example and FAQs — and a one-tap path into Build.

All strategies

Numbers you can check

Every figure says where it came from: the quote time, the model and its inputs. The methodology documents each formula and its limits, so you can reproduce a result — or disagree with it.

Read the methodology

Pricing model: Black-Scholes-Merton with a continuous dividend yield, floored at intrinsic value
Risk-free rate: US Treasury daily par yield curve, interpolated to each leg's expiry
Market data: Indicative option quotes, with the quote time on screen
Implied volatility: Calibrated to each contract's bid/ask midpoint under the same model
Time: Calendar time to the 16:00 New York close, early closes included

Probability of finishing above a breakeven K

P(S_T > K) = N(d₂) − e^rT·S·e^−qT·φ(d₁)·√T·∂σ/∂K

Your next trade, fully mapped.

Nothing to install and no sign-up. Saved trades stay in this browser.

Open the app See the SPY chain

See every options payoff before you trade.

One app for the whole trade

Shape the trade, read the verdict

A dense chain with the vol picture beside it

A morning check that flags what needs you

Ranked ideas for your outlook

Commonly paywalled elsewhere. Free here.

Probability of profit

Net Greeks

IV rank & percentile

Scans

Saved trades & alerts

A guide for every strategy

Covered Call

Cash-Secured Put

Bull Call Spread

Iron Condor

Long Straddle

Calendar Spread

Numbers you can check

Your next trade, fully mapped.