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COLD HARDCUSTODY

Free tools

Bitcoin calculators

Private by design: everything runs in your browser. Nothing you type leaves your device; numbers are never sent anywhere.

Backtest

DCA backtester

Monthly dollar-cost averaging since 2013.

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Live

Sats ⇄ BTC ⇄ USD

Live price converter.

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Hindsight

What if I bought…

Lump-sum hindsight calculator.

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CPI

Inflation calculator

Dollar buying power since 1947, vs BTC.

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