# 123 Calculator: Reverse Keypad > 123 Calculator: Reverse Keypad (iPhone/iPad app by ZHUO KANG.) - Source: https://appshunter.io/ios/app/123-calculator-reverse-keypad/id6811611656 (this page in markdown: same URL + `.md`) - Developer: [ZHUO KANG](https://appshunter.io/developer/6775824773) - Category: Utilities - Price: Free - Age rating: 4+ - Requires: iOS 17.0 · 1 MB - Languages: English - Released: 2026-09-22 - Data updated: 2026-10-19 ## What is 123 Calculator? 123 Calculator is a focused calculator with a phone-style keypad: 1, 2, and 3 start on top. Tap 1 ⇄ 7 to switch instantly between phone order and traditional calculator order. It includes four-function arithmetic, percentages, decimals, repeated equals, adaptive number display, haptic feedback, and VoiceOver labels. Calculations run locally on your iPhone. No account, network connection, ads, tracking, or permissions required. ## Is 123 Calculator safe? Not enough ratings yet to assess 123 Calculator. ## Is 123 Calculator legit? 123 Calculator: Reverse Keypad has limited verification signals. The AppsHunter Legitimacy Score for 123 Calculator is 55 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 1 release) ### 1.0 — 2026-09-22 No release notes. ## More apps by ZHUO KANG - [VoxPho](https://appshunter.io/ios/app/voxpho/id6777639957) - [UTV Remote](https://appshunter.io/ios/app/utv-remote/id6781496220) - [HydrateLock: Must-Drink Alarm](https://appshunter.io/ios/app/hydratelock-must-drink-alarm/id6799812964) - [SleepLock: Must-Sleep Alarm](https://appshunter.io/ios/app/sleeplock-must-sleep-alarm/id6799816048) - [LeaveLock: Must-Leave Alarm](https://appshunter.io/ios/app/leavelock-must-leave-alarm/id6799877625) - [SqPulse: Sales for Square](https://appshunter.io/ios/app/sqpulse-sales-for-square/id6808631305) All apps by ZHUO KANG: https://appshunter.io/developer/6775824773 --- *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 2026-10-19.*