Sumi
A notepad where every line is a calculation
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Sumi - A notepad where every line is a calculation

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Write lines like "hotel = 128 EUR per night" and see the answer on the right. Change one number and everything below updates. About 160 currencies and 20+ cryptocurrencies, with built-in rates for offline use, plus units, dates, time zones and itemized bill splits. iPhone, iPad and Mac. No account, no subscription.

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Hi Product Hunt, I'm Sigit and I made Sumi.

For trip budgets and splitting bills with housemates I kept doing the same thing: write it in Notes, switch to Calculator, copy the number back, then redo it all when one price changed. Spreadsheets felt too heavy for that.

Sumi is a notepad where every line is a calculation. You write "rent = 2450 EUR" and "each = rent / 4", and the answers sit on the right. Change the rent and everything below follows.

A few things it does:

  • About 160 currencies and 20+ cryptocurrencies, live rates, built-in rates when you're offline

  • Units, dates and time zones ("2:30 pm HKT in Berlin")

  • Itemized bills: who ordered what, shared plates, tax and service, who already paid

  • On iPad, a sidebar with every sheet, tabs and keyboard shortcuts (⌘T, ⌘K)

  • On the Mac, Quick sum opens with ⌥ Space from any app

Free with 3 sheets. Pro is $7.99 once (US price) with a 7-day trial: unlimited sheets, iCloud sync between iPhone, iPad and Mac, more themes and widgets. It's the same purchase on all three, with Family Sharing. No account, no tracking.

I'd love to hear what you'd use it for, and what it gets wrong.