# SumKey: Calculator Keyboard — Private numpad, percent & tip

> Private numpad, percent & tip (iPhone/iPad app by Che Wei Li.)

- Source: https://appshunter.io/ios/app/sumkey-calculator-keyboard/id6793052963 (this page in markdown: same URL + `.md`)
- Developer: [Che Wei Li](https://appshunter.io/developer/6793052965)
- Category: Utilities, Finance
- Price: $1.99
- Age rating: 4+
- Requires: iOS 16.0 · 2 MB
- Languages: American English, Japanese, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-08-02
- Data updated: 2026-09-25
- User reviews in markdown: https://appshunter.io/ios/app/sumkey-calculator-keyboard/id6793052963/reviews.md

## What is SumKey?

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


## Version history (last 4 releases)

### 1.0.3 — 2026-09-21

This update only revises the App Store listing. Nothing in the app itself has changed.

### 1.0.2 — 2026-08-20

Features:
• Operator Key Order now shows a keyboard diagram
• Custom toolbar keys can now be edited
• The "Add Custom Key" entry moved into the Added list, where it's easier to find
• Thousands separator is now on by default
• Settings cleanup: larger, easier-to-read descriptions, clearer grouping, and a leaner default toolbar

### 1.0.1 — 2026-08-11

• Clearer keys everywhere: white key caps with subtle shadows in light mode and a unified dark palette — easy to read in Notes, Messages, and every other app
• Fixed keyboard light/dark appearance mismatches in some apps
• The home-screen widget now mirrors your keyboard layout settings (operator order, custom keys, position of 0)
• Added a gentle rating prompt — we'd love your feedback

### 1.0 — 2026-08-03

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-25.*