# devCalc Pro — Developers Calculator Pro

> Hybrid engineering, scientific, and programmer calculator with number base conversion and engineering mode. (iPhone/iPad app by Tamas Rudnai.)

- Source: https://appshunter.io/ios/app/devcalc-pro/id606025918 (this page in markdown: same URL + `.md`)
- Developer: [Tamas Rudnai](https://appshunter.io/developer/596652956)
- Category: Utilities, Productivity
- Price: $2.99
- Rating: 4.80/5 from 39 App Store ratings · 30 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 5 MB
- Languages: American English
- Released: 2013-03-11
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/devcalc-pro/id606025918/reviews.md

## What is devCalc Pro?

devCalc Pro is an perfect blend of an engineering, a scientific and a programmers calculator.

Unique features:

• Easy number base conversion from Binary, Octal, Decimal and Hexadecimal (bin, oct, dec, hex)
• Real Engineering mode allows you to display big and small numbers in human readable format
• Extensive functions for Scientists and Software Developers - Rotate device to landscape mode
• Swipe LCD display sideways to change color theme

devCalc is designed from top to bottom developers and engineers in mind. As a hybrid scientific and programmer calculator it gives smooth blend for IT professionals, engineers and scientists as well as university students. 

Real Engineering Mode is an innovative input and display method, that makes engineers life easier by automatically scaling the number to a human readable format. This allows you to concentrate on the calculation rather than how to translate that to a calculator friendly format.

To enter a number in Real Engineering Format even in decimal mode: Just tap on the Kilo, Mega, Giga, Milli, Micro or Nano buttons. The calculator then automatically scales the calculated numbers and displays it in the way you got used to.

For example 500k * 3 automatically displayed as 1.5M. In the meanwhile devCalc Pro keeps the high precision value, therefore later on you can switch the view back to Kilo to see 1'500k, or turning the Real Engineering Mode completely off by tapping on the "k" button again to see all the decimal digits (1'500'000). Try this new and unique feature out and tell us your story how you use Real Engineering Mode.

One of the great examples is to calculate Ohm’s law in electronics: You are looking for a resistor value for 5V and 3mA, so you type: 5 / 3m and you will see 1.67k on the screen (1.67 kilo-Ohm).

## Key features

- Number base conversion (Binary, Octal, Decimal, Hexadecimal)
- Real Engineering Mode for human-readable number scaling
- Extensive functions for scientists and developers
- Device rotation for landscape mode
- Swipeable LCD display for color theme changes

## Recent user reviews (10 of 30)

All indexed reviews: https://appshunter.io/ios/app/devcalc-pro/id606025918/reviews.md

### 5/5 — Awesome

*2024-10-11*

I got this calculator because I needed one that has hex, binary conversion. I am very pleased with devCalc pro. The only improvement I can suggest is to not remove the programmer’s helpful functions in decimal mode. i.e. I can only get OR, NOT, XOR functions when not in decimal mode.

### 5/5 — Perfect with classic Windows’s calculator

*2024-09-06, version 1.8.6*

Perfect

### 5/5 — Works great on iOS 14

*2023-11-29*

Glad to have a programming calculator that also works fine with decimal unlike certain hp calculators, and also doesn’t require rpn input. But... no backspace key? Lose a star for that. Added the backspace key. Thanks.

**Developer response:** Thank you for your feedback. A new version has been just released which adds the backspace key. Tap once to delete one digit or hold it to auto-repeat, deleting a longer number. When no more digits to delete, it automatically switches back to CE button to delete errors and the entire calculations just like before.

### 5/5 — Works great on iOS 14

*2023-11-21*

Glad to have a programming calculator that also works fine with decimal unlike certain hp calculators, and also doesn’t require rpn input. But... no backspace key? Lose a star for that.

Added the backspace key. Thanks.

Unfortunately crashes now under iOS 17.1.1

**Developer response:** Thank you for your feedback. A new version has been just released which adds the backspace key. Tap once to delete one digit or hold it to auto-repeat, deleting a longer number. When no more digits to delete, it automatically switches back to CE button to delete errors and the entire calculations just like before.

### 5/5 — Finally, an iPhone calculator that does it all.   Thank you.

*2023-08-27*

Thank you for a very nicely written calculator app.

### 5/5 — Perfect

*2022-10-19, version 1.8*

This is not only a very practical / useful app for electronics but looks great too with the old retro display options. Brilliant!

### 4/5 — Fix the hexadecimal 7-deg digits

*2022-07-04, version 1.7*

Now that I’ve used this app for a while now I think the hexadecimal digits for ‘d’ and ‘b’ need to be changed into their normal lowercase style because otherwise they look nearly identical to a ‘0’ or a ‘8’ digit making it extremely difficult to read
I’d also like to see monospaced digits instead of proportional spaced digits.

### 5/5 — Works great on iOS 14

*2020-12-31, version 1.7*

Glad to have a programming calculator that also works fine with decimal unlike certain hp calculators, and also doesn’t require rpn input. But... no backspace key? Lose a star for that.

**Developer response:** Thank you for your feedback. A new version has been just released which adds the backspace key. Tap once to delete one digit or hold it to auto-repeat, deleting a longer number. When no more digits to delete, it automatically switches back to CE button to delete errors and the entire calculations just like before.

### 2/5 — DevCalc Pro

*2019-01-27*

Fix it. Rotating phone makes no difference. Display does not rotate to other features.

**Developer response:** Thank you for your review, your feedback matter to us. Display rotation will only work if this function is not locked on your phone. Please follow this instruction and make sure Portrait Orientation is not locked.

https://support.apple.com/en-us/HT204547

### 5/5 — Best Calculator App I have found so far

*2018-03-12*

Excellent job. The programmer functions are perfect for my needs. This is the best calculator App that I have found so far.

## Frequently asked questions about devCalc Pro

### What does devCalc Pro do?

devCalc Pro is a versatile calculator that combines engineering, scientific, and programmer functionalities. It allows for easy number base conversions between Binary, Octal, Decimal, and Hexadecimal. A standout feature is its 'Real Engineering Mode,' which displays numbers in a human-readable format, simplifying complex calculations for engineers and scientists.

### What are the key features of devCalc Pro?

Key features include seamless number base conversion, a unique 'Real Engineering Mode' for scaling numbers to human-readable formats (e.g., displaying 1,500,000 as 1.5M), extensive functions suitable for scientists and software developers, device rotation for landscape use, and the ability to change the display color theme by swiping the LCD.

### Is devCalc Pro free to use?

Yes, devCalc Pro is available for free. The application does not feature in-app purchases or advertisements, providing an uninterrupted user experience for all its functionalities.

### Who is the target audience for devCalc Pro?

This application is specifically designed for developers, engineers, scientists, and university students. Its hybrid nature caters to the diverse calculation needs of IT professionals and academic users alike.

### How does the 'Real Engineering Mode' work?

The 'Real Engineering Mode' simplifies the display of large or small numbers. By tapping on prefixes like Kilo, Mega, Giga, Milli, Micro, or Nano, the calculator automatically scales the number to a human-readable format (e.g., 500k * 3 displays as 1.5M). The app retains the high-precision value, allowing you to switch views or turn the mode off to see the full decimal digits.

## Version history (last 5 releases)

### 1.8.6 — 2024-05-15

Improved external keyboard support & Native Mac version.

### 1.8.5 — 2024-04-29

Added physical keyboard support

You can use devCalc Pro with an external keyboard on iPhone, iPad and Mac with M1, M2 and M3 Apple Silicon chip.

### 1.8.4 — 2023-11-25

This version contains bugfixes and improvements

### 1.8.3 — 2023-11-23

This version contains bugfixes and improvements.

### 1.8.2 — 2022-10-28

Bug fixes and improvements

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## More apps by Tamas Rudnai

- [devCalc](https://appshunter.io/ios/app/devcalc/id596652953)
- [Open Air Rádió](https://appshunter.io/ios/app/open-air-radio/id1482166322)
- [NetGO CPA](https://appshunter.io/ios/app/netgo-cpa/id6470384339)

All apps by Tamas Rudnai: https://appshunter.io/developer/596652956

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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 2026-06-10.*