# Calc4Key — Calculator on keyboard

> Calculator integrated directly into the mobile keyboard for on-the-go calculations. (iPhone/iPad app by Khang Le.)

- Source: https://appshunter.io/ios/app/calc4key/id1585531759 (this page in markdown: same URL + `.md`)
- Developer: [Khang Le](https://appshunter.io/developer/1078541780)
- Category: Utilities, Productivity
- Price: $0.99
- Rating: 4.60/5 from 821 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 9 MB
- Languages: American English
- Released: 2021-09-14
- Data updated: 2026-09-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/calc4key/id1585531759/reviews.md

## What is Calc4Key?

Use calculator directly on keyboard anywhere, anytime. No switch apps,  no copy and paste results anymore!

You must enable the keyboard under system settings, then select it in your keyboard, using the globe button.
1. Open the settings app
2. Go General > Keyboard > Keyboards > Add New Keyboard
3. Add Calc4Key
4. Start typing in any app
5. Press "globe" icon to switch to the Key4Cal keyboard
6. Enjoy

## Key features

- Calculator on keyboard
- Calculate anywhere
- No app switching
- No copy-paste results
- Easy keyboard selection

## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/calc4key/id1585531759/reviews.md

### 2/5 — Annoying

*2024-11-08*

The app likes to open with how to activate the keyboard, einebne when activated. And you can’t get past it.

### 1/5 — NO percentage “%” button…

*2023-11-29, version 1.0.1*

After I downloaded and installed this app, I don’t see or can’t add the percentage button. 
I sent several emails to the developer and NO response.

### 1/5 — Its not working when we press return key and calculate in down row

*2023-03-28, version 1.0.1*

Its not working when we press return key and calculate in down key.

### 5/5 — I really like this application

*2022-08-29, version 1.0.1*

The best app

### 5/5 — جدا راقي

*2022-03-17, version 1.0.1*

راقي

### 5/5 — Keyboard Calc is amazing

*2022-02-05, version 1.0.1*

It’s facilitating my daily life and saving my time instead of keep swiping between two apps or focus on two devices ! Thank you programmed  for your great creativity 👍

### 5/5 — رائع

*2021-12-10, version 1.0.1*

مشكورين 🌹🌹🌹🌹.

## Frequently asked questions about Calc4Key

### What does Calc4Key do?

Calc4Key is a utility that integrates a calculator directly into your mobile keyboard. This allows you to perform calculations without leaving the app you are currently using, eliminating the need to switch between applications or copy and paste results.

### How do I enable and use the keyboard?

To use Calc4Key, you must first enable it in your system settings. Navigate to Settings > General > Keyboard > Keyboards > Add New Keyboard and select Calc4Key. Once added, you can switch to it by pressing the globe icon on your keyboard while typing.

### Is Calc4Key free to use?

Yes, Calc4Key is available for free. The application does not have any in-app purchases or advertisements, offering a completely free experience for users.

### What are the benefits of using a keyboard calculator?

Using a keyboard calculator like Calc4Key significantly streamlines your workflow. You can quickly perform calculations for budgeting, data entry, or any other task directly within the app you're using, saving time and reducing the hassle of switching between apps.

## Version history (last 2 releases)

### 1.0.1 — 2021-09-14

Fixed minor bug

### 1.0 — 2021-09-14

No release notes.

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## More apps by Khang Le

- [Fire Hero](https://appshunter.io/ios/app/fire-hero/id1078541781)
- [Tap Apple: Don't Tap The Others](https://appshunter.io/ios/app/tap-apple-dont-tap-the-others/id1084630793)
- [Fire Hero: Another Story](https://appshunter.io/ios/app/fire-hero-another-story/id1095188495)
- [SEAL Team](https://appshunter.io/ios/app/seal-team/id1111927939)
- [Circle Shield](https://appshunter.io/ios/app/circle-shield/id1119413976)
- [Cylinders](https://appshunter.io/ios/app/cylinders/id1123511564)

All apps by Khang Le: https://appshunter.io/developer/1078541780

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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 2026-09-07.*