Sumi: Notepad Calculator

Math notes, currency & units

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

New: two Catppuccin themes, Frappé and Macchiato, a Mocha app icon, and the dark Espresso theme is now free for everyone. 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

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Make Sumi yours. Two new Catppuccin themes, Frappé and Macchiato, join Latte and Mocha, with a new theme picker. The dark theme is now called Espresso, and it's free for everyone. There's also a new Mocha app icon, and the Dark and Light icons are now called Espresso and Cream. Also in this update: - Rounding: write "round total", "round up 7.2 h", "round down 4.8" or "round 3.14159 to 2 decimals", and the unit stays. Inside a formula, round(), ceil() and floor() work too. - Write notes without "#": a line of plain words no longer shows a question mark. - Shared images are more compact, so more of your sheet fits in one picture. - Fixed a moment where text looked doubled when you hid the keyboard on a long sheet. Something not adding up? Write to hello@trysumi.app.

The developer, Sigit Kuncoro, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    Sigit Kuncoro
    Size
    4.7 MB
    Category
    Utilities
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2026 Sigit Kuncoro