# Calculator Keyboard - Calku — Calculate from your keyboard

> Keyboard calculator for in-app calculations without switching applications. (iPhone/iPad app by Supagarn Pattananuchart.)

- Source: https://appshunter.io/ios/app/calculator-keyboard-calku/id1546065778 (this page in markdown: same URL + `.md`)
- Developer: [Supagarn Pattananuchart](https://appshunter.io/developer/1488328374)
- Category: Utilities
- Price: Free with in-app purchases
- Rating: 4.70/5 from 494 App Store ratings · 56 written reviews indexed
- Age rating: 4+
- Requires: iOS 14.0 · 3 MB
- Languages: American English
- Released: 2020-12-30
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/calculator-keyboard-calku/id1546065778/reviews.md

## What is Calculator Keyboard?

Calku transforms your keyboard into a handy calculator, making quick calculations effortless without switching apps! Whether you're texting, taking notes, or browsing, you can instantly calculate within any app. Perfect for messaging, homework, or day-to-day tasks.

Compatible with many apps such as 
• Messages, Messenger, WeChat, Line, 
Twitter, Telegram, Instagram, etc.
• Safari
• Notes
• Mail
• Stocks
• And many more!

Features :
• Supports Dark Mode 
• Full iPadOS Compatibility 
• Customizable Decimal Points 
• Powerful Scientific Calculator 
• Access Your Calculation History 
• Keyboard Feedback (Sound & Haptic)

Say goodbye to app-switching and copying-pasting—Calku makes calculations easy and seamless in any app!

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://supagarn-pa.com/Calku/privacy-policy

## Key features

- Calculate within any app
- Supports Dark Mode
- Customizable decimal points
- Scientific calculator functions
- Calculation history access
- Keyboard feedback options

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Calku PRO (1 Month) | $0.99 | per month |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Calku Pro - Lifetime | $5.99 | one-time |


## What do users think of Calculator Keyboard?

Overall sentiment: positive

**Pros**

- 👍 Very useful application
- 🚀 Handy calculator within keyboard
- 💡 Innovative idea for an app
- 👍 Easy to use
- 🔒 Respects user privacy
- 💰 Good value for paid features
- ✨ Simple and effective
- 💯 Best calculator app
- 👍 Works flawlessly
- ✅ No bugs reported

**Cons**

- 🐛 Cannot delete the app
- 🐛 Buggy at times
- 🐛 Non-standard division/multiplication symbols
- 🐛 Incorrect calculations
- 🐛 Doesn't work on all apps initially
- 🐛 Difficult to add keyboard
- 🐛 No scientific calculator

**Commonly reported bugs**

- Cannot delete the app
- App is buggy sometimes
- Non-standard division and multiplication symbols not recognized by other apps
- Incorrect calculations (e.g., 3.10 / 1000 = 0)
- App only works on Apple Mail and Notes initially
- Cannot get it to 'Add Keyboard' on specific devices/iOS versions
- No scientific calculator available

**Most requested features**

- Add thousands separator for numbers
- Haptic feedback on key presses
- Option to hide computation in text box
- History button on main page
- Option for standard multiplication and division
- Add scientific/accountant calculator
- Add Pi, square root, etc. to calculator
- Vibration on touch

## Recent user reviews (10 of 56)

All indexed reviews: https://appshunter.io/ios/app/calculator-keyboard-calku/id1546065778/reviews.md

### 4/5 — 没有中文版

*2026-06-06*

差评

### 5/5 — Best Keyboard ever

*2026-05-29*

Exactly what I needed!!! Calculator in my notes app, in my messages. Makes budgeting a breeze, only thing its missing is dollar signs and some formatting!

### 1/5 — Fake

*2026-05-27*

Does not actually add a calculator to your normal keyboard

### 5/5 — 不能计算整数➗小数

*2025-07-10*

平时挺好用的，就是为什么不能计算整数➗小数

### 5/5 — Fix pls

*2025-04-30, version 3.7*

Thêm dấu phẩy phân cách hàng ngàn ở các số đầy đủ luôn nha

### 5/5 — It now works after a restart! It only works on apple mail and apple notes?????

*2025-03-29, version 3.7*

Update: switching to 5 stars since it now finally works on all my apps after restarting my phone! 

What is going on? The app only works on apple mail and notes? I might need a refund in this case! I am using it on the latest ios public build on an iPhone 15 pro max

### 5/5 — 棒

*2025-03-17, version 3.7*

超方便，超好用

### 1/5 — Really Bad Advertisement

*2025-02-21, version 3.7*

Cannot use text saving at all

### 4/5 — Nice one

*2024-12-29*

Good calculator keyboard, but require hepatic on pressing keys also pop up keys.

### 5/5 — pro，lifetime限免

*2024-12-14*

pro，lifetime限免

## Frequently asked questions about Calculator Keyboard

### What does this app do?

This application transforms your device's keyboard into a fully functional calculator. It allows you to perform calculations directly within any app you are using, eliminating the need to switch between applications or copy and paste numbers.

### What are the key features of this calculator keyboard?

Key features include the ability to calculate within any app, support for Dark Mode, customizable decimal points, a powerful scientific calculator, access to your calculation history, and keyboard feedback options like sound and haptics.

### Is this app free to use?

The application is free to download and use, offering core calculator functionalities. It also includes in-app purchases, which may unlock additional features or customization options for users who wish to enhance their experience.

### What apps is this calculator keyboard compatible with?

This calculator keyboard is designed to be compatible with a wide range of applications. This includes messaging apps like Messages, Messenger, WeChat, and Line, as well as browsers like Safari, note-taking apps, mail clients, and many more.

### How does this app help with daily tasks?

It simplifies daily tasks by integrating calculation capabilities directly into your typing experience. Whether you're quickly checking a price while shopping, solving a problem for homework, or managing finances, you can do so seamlessly without interrupting your workflow.

## Version history (last 5 releases)

### 4.0 — 2026-07-26

• Performance improvements
• Bug fixes

### 3.9 — 2025-12-21

• Performance improvements
• Bug fixes

### 3.8 — 2025-07-30

• Performance improvements
• Bug fixes

### 3.7 — 2024-12-11

• Performance improvements
• Bug fixes

### 3.6 — 2024-12-11

• Performance improvements
• Bug fixes

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## More apps by Supagarn Pattananuchart

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- [Image Resizer - Photo Compress](https://appshunter.io/ios/app/image-resizer-photo-compress/id1573564366)
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- [PiP - Picture in Picture](https://appshunter.io/ios/app/pip-picture-in-picture/id1635796246)

All apps by Supagarn Pattananuchart: https://appshunter.io/developer/1488328374

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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 2026-08-31.*