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What if / time machine
Model an investment using your own prices or real historical observations.
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What if / time machine
Model an investment using your own prices or real historical observations.
Hypothetical mode uses prices you enter. Historical mode fetches actual dated observations; unavailable history is not filled with sample data. Entry fees come out of the investment. Exit costs and taxes are excluded. Historical performance does not predict future returns.
Your calculation inputs stay in this browser. Market and history requests send the selected asset and date range to our price-data endpoint. Reference methodology checked October 1, 2026.