SumKey: Calculator Keyboard

Math numpad, tip & bill split

$1.99 · Designed for iPad. Not verified for macOS.

The calculator keyboard that can't see what you type. Do the math right where you're already typing. Need to do quick math while typing? Stop app-switching. SumKey puts a calculator inside your keyboard: type an expression anywhere (Notes, chats, email) and tap "=" to get the answer, or long-press "=" to keep just the result. Split a bill, quote a price, check a discount: wherever numbers come up, finish the math right there. KEY FEATURES ● Calculate as you type: tap "=" after any expression and the answer appears inline; long-press "=" to keep just the result ● Percent math the way you think: 4500 - 15% gives the discounted amount instantly ● History inside the keyboard: tap to re-insert a previous result or the whole expression; clearing always asks for confirmation ● Customizable toolbar: clear, cursor keys, forward delete, dismiss keyboard. Add, remove, and reorder freely, or create one-tap custom text keys ● Rearrangeable keys: swap the operator column and function keys; the spare key slot can be ( ), 00, 0.00 and more ● f(x) panel for advanced functions: √, x², x^y, sin/cos/tan, ln, log, π and more ● Every calculation rule is a setting: 0–8 decimal places, rounding mode, thousands separators, implicit multiplication, auto-closing parentheses, operator spacing ● Home Screen widget: calculate on your Home Screen (iOS 17+), sharing the keyboard's settings ● Make it yours: light and dark themes that follow the system, 8 accent colors, and your choice of a black or white app icon ● Localized in English, Traditional Chinese, Japanese, and Simplified Chinese PRIVACY: WE CAN'T SEE WHAT YOU TYPE SumKey never asks for Full Access. That is a system-level guarantee: we cannot see, store, or upload anything you type. The keyboard cannot connect to the internet, contains no analytics or tracking, and works fully offline. Your calculation history stays on your device only. ONE-TIME PURCHASE Pay once, own everything. No subscription, no ads, no account, no in-app purchases. SUPPORT Questions or ideas? Email doka.software@gmail.com

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The developer, Che Wei Li, 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.

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    Accessibility

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

    Information

    Seller
    • Che Wei Li
    Size
    • 1.7 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • iPad
      Requires iPadOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    Languages
    English and 3 more
    • English, Japanese, Simplified Chinese, Traditional Chinese
    Age Rating
    4+
    Copyright
    • © 2026 Doka Software
  • Privacy Policy

    • Supports

    • Family Sharing

      Up to six family members can use this app with Family Sharing enabled.