Here’s how it usually goes.
You’ve worked out the trip split, the freelance quote, the household budget. You got your answer. Then a week later someone asks, “How did you get that?” and you’re starting over.
Calculators forget the moment you clear them. Spreadsheets turn a five-minute question into a project. Neither one keeps the reasoning.
I built Napkin because I kept losing my own math. You type the way you think, with labels, notes, and what-ifs, and every answer stays right next to how you got there. So when someone asks how you got that number, you just send the sheet.
Do the math. Show your work. Take it with you.
Napkin is free, and it works without an account. An account keeps your sheets in sync across your devices: one price, once a year, no tiers. Your sheets are always yours. Save them to disk or export plain text anytime. No ads, no tracking. Paying for an account is what keeps Napkin going.