# Calculator & Converter - EYSK — Easy and Powerful Calculator

> Easy-to-use iOS calculator and converter with scientific and memory functions. (iPhone/iPad app by Kiseon Cho.)

- Source: https://appshunter.io/ios/app/calculator-and-converter-eysk/id1620029636 (this page in markdown: same URL + `.md`)
- Developer: [Kiseon Cho](https://appshunter.io/developer/1609478221)
- Category: Productivity, Utilities
- Price: Free
- Rating: 3.00/5 from 2 App Store ratings · 3 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.3 · 1 MB
- Languages: American English
- Released: 2022-05-20
- Data updated: 2026-09-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/calculator-and-converter-eysk/id1620029636/reviews.md

## What is Calculator & Converter?

EYSK Cal supports various mathematics functions that are simple and easy to use in iOS environments.

Overall features are,

- Incredibly easy-to-use and intelligent calculator
- Simple Interface
- Supports mathematics functions, scientific functions, and converter functions
- Elaborate and neat UI for input, output, and user controls 
- Convenient and versatile control functions
- Calculation result real-time displayed as you input
- Blinking cursor for improved usability
- Organized into four efficient tabs with valuable features (General, advanced, Constant, and Convert)
- Inputs and results are shared across all categories.
- Supports continuous input (c.f, 123 + 456 x 789 ÷ 321  + 123 than 500.518)
- Reuse the previous results using M0 ~ M4 memory left side Text Buttons
- Copied to the clipboard using M0 ~ M4 memory right side Circle Buttons
- Supports various kinds of mathematics functions in each sub-functions
- Seven colors can be changed for the primary text
- Provided the options for customizer

## Key features

- Intelligent calculator with simple interface
- Supports mathematics, scientific, and converter functions
- Real-time calculation results display
- Memory functions (M0-M4) for reusing results
- Organized into four efficient tabs
- Customizable primary text colors

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/calculator-and-converter-eysk/id1620029636/reviews.md

### 1/5 — Great is wrong!

*2026-06-17*

Can’t handle very big numbers

### 5/5 — Neat little toolbox.

*2024-05-11*

Does what I want, which is to compute naturally, i.e., 1   1 = 2 (NOT 1, ENTER, 1,  ).  But it does so much more.  It anticipates the equation, giving you running results.  So, for the equation 2 x 345, it will generate an intermediate result of 6, as soon as you enter "2 x 3".  The intermediate result will change to 68, as soon as you enter the next digit "4".  And the answer will change again to 690, as soon as you enter the final digit "5".  Hit the equals sign and not only does that finalize the answer, but it automatically is saved in a scrolling memory feature.  How neat is that!   Its main shortcoming is that it is limited to single operations only.  No hiearchy of functions and no embedded paranthetical expressions.  Just simple equations.  (However, it does allow you to directly manipulate memory items, so it can be used to evaluate multi-factor/multiple operand equations - but not very elegantly.). Bottom line:  It does what I need a simple calculator to do.  5 stars.

### 5/5 — Great

*2022-05-21*

Great

## Frequently asked questions about Calculator & Converter

### What makes Calculator & Converter - EYSK easy to use?

Calculator & Converter - EYSK features an incredibly easy-to-use and intelligent calculator with a simple interface. It displays calculation results in real-time as you input them and offers a blinking cursor for improved usability.

### What types of calculations does Calculator & Converter - EYSK support?

Calculator & Converter - EYSK supports general mathematics functions, advanced scientific functions, and various converter functions. It also allows for continuous input, enabling complex calculations like '123 + 456 x 789 ÷ 321 + 123'.

### How can I reuse previous calculation results in Calculator & Converter - EYSK?

Calculator & Converter - EYSK provides memory functions M0 through M4. You can reuse previous results using the text buttons on the left side and copy them to the clipboard using the circle buttons on the right side.

### Can I customize the appearance of Calculator & Converter - EYSK?

Yes, Calculator & Converter - EYSK offers customization options. You can change the primary text color from seven available options to personalize your experience.

### What devices is Calculator & Converter - EYSK compatible with?

Calculator & Converter - EYSK is compatible with a range of Apple devices, including Mac, iPhone, iPad, and iPod.

### How often is Calculator & Converter - EYSK updated?

Calculator & Converter - EYSK was last updated on July 12, 2023, with version 2.3. This indicates a relatively recent update, suggesting ongoing support and development.

### What is the age rating for Calculator & Converter - EYSK?

Calculator & Converter - EYSK has an age rating of 4+, making it suitable for a wide range of users.

### Does Calculator & Converter - EYSK have ads?

No, Calculator & Converter - EYSK does not contain advertisements. It is a completely ad-free application.

## Version history (last 5 releases)

### 3.0 — 2026-09-02

Updated item as below,
- Standardize the app launch screen across iOS and macOS
- Fix the issue where small numbers are displayed in scientific notation (e.g., using “e”)
- Other improvements

### 2.3 — 2023-07-12

updated item as below,
- change the selected tab background color
- etc.

### 2.2 — 2023-07-11

updated item as below,
- change the Tab button response time
- etc.

### 2.1 — 2023-07-06

updated item as below,
- ICON change
- Minor code change (not bug)

### 2.0 — 2023-06-21

updated item as below,
- Screen rotate bug fix

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## More apps by Kiseon Cho

- [Block Puzzle - EYSK TET](https://appshunter.io/ios/app/block-puzzle-eysk-tet/id6449723713)

All apps by Kiseon Cho: https://appshunter.io/developer/1609478221

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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 2026-09-11.*