Sumi: Notepad Calculator

Sumi is a notepad where every line is a calculation. Write "rent = 2450 EUR" and it keeps the number. Write "rent / 4" on the next line and you get each person's share. I use it for trip budgets, splitting bills with housemates, counting hours for invoices and checking how many days are left until a deadline. It handles currencies, units, time and dates, so you can write things like: hotel = 128 EUR per night hotel × 4 prev + 15% total in usd 8 h × 5 days days until 25 dec Rp 150rb × 3 "prev" is the line above and "sum" adds up everything above it. Change one number and the rest update. Currencies: 18 of them, including USD, EUR, GBP, JPY, IDR, SGD, INR and AUD. Rates are built in, so conversion works offline. Units: weight, length, volume, area, speed, temperature, data and energy. There's a reference page listing every unit and shortcut, and you can tap an example to add it to your sheet. Big numbers: 2.5k, 1.2M and 3bn work, and so do rb, jt and miliar if you're used to writing Indonesian amounts. You can also pick how numbers look: 1,234.56, 1 234,56 or 1.234,56. While you type, the other lines fade back so you can see what you're working on. Hold a result to copy it. Search looks through every sheet, and you can copy a whole sheet as tidy aligned text to paste into a chat. There's no account and no ads, and nothing is tracked. Your sheets are stored on your phone and don't go anywhere else. Sumi is free with up to 3 sheets. Sumi Pro is a one-time purchase, with a 7-day free trial and Family Sharing. It adds unlimited sheets, live exchange rates, the Dark, Latte and Mocha themes, pinning a line's result to the bottom bar, sharing sheets as images, and alternate app icons. There's no subscription. Questions or ideas: hello@trysumi.app