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Live Greeks on option trades
Greeks describe how the position reacts. Vega trader sums Delta, Gamma, Theta, and Vega for the legs on a trade so you can see the exposure you actually hold.
Four numbers on the trade
The trade page shows Theta, Delta, Gamma, and Vega for the open legs. Delta is the position’s sensitivity to the underlying price. Gamma is how fast that delta changes. Theta is the daily effect of time passing. Vega is the sensitivity to implied volatility.
A short premium position often shows positive theta and negative vega. A long straddle shows the opposite. The sign on the trade is more useful than a textbook definition, because it is the sum of the legs you logged.
They follow the quotes
The figures update with market data for the underlying and the options. Real-time quotes, including bid, ask, midpoint, and implied volatility, are part of Essential. On the Free plan, market data on a trade is delayed. The public calculator does not replace this view: it sketches a payoff, while the trade page shows the Greeks of a logged position.
Read the definition, then the position
The Greeks guides explain each measure on its own. Use them when you want the definition. Use the trade page when you want the number for the position that is open now. Vega AI can also summarize that exposure in a sentence if you would rather ask than scan the table.