Tools
Pure client-side math - nothing you type leaves your browser.
Card finderThree questions, matching cards with reasons.
True cost calculatorThe full fee stack for your spending profile.
Sats cashback mathDoes the paid tier pay for itself?
Stack builderCard rewards vs flat DCA - in sats, same money.
Borrow vs sellLoan size and the exact liquidation price of a BTC loan.
Tax-event estimatorWhat a card spend triggers - US, DE, UK presets.
Load plannerOn-chain vs Lightning per top-up amount.
BTC converterCrypto to fiat, net of card load fees.
Country checkerWhat serves your region - documented, not guessed.
Side-by-side compare2-3 cards head to head.