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Kalkulilo (Calculator)

Kalkulilo (Calculator)

by Alexander Clauss

29 ratings
418 reviews
📚 Education
📊 Productivity
$2.99
In-App Purchases

Details

  • Released
  • Updated

Features

Developer

Alexander Clauss
✨Promote your app ✨
Kalkulilo (Calculator) screenshot #1 for iPhone
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Kalkulilo (Calculator) screenshot #5 for iPhone
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Kalkulilo (Calculator) screenshot #7 for iPhone
Kalkulilo (Calculator) screenshot #8 for iPhone
iphone
ipad
watch
🧾$0.99
In-App Purchase↘︎
📌Ready
Reviews summary↘︎
⭐418
Reviews↘︎
🔄6+ apps
Alternatives↘︎
❓5 answered
FAQ↘︎
📦~ in 3 months
Updates frequency↘︎
🖼️Get Icon
Icons↘︎

About

This app offers a versatile calculator with multiple modes, including scientific, bitwise, statistical, trigonometric, base conversion, and time calculations. It features a simple mode with large buttons and customizable interface. Widgets for notification center and Apple Watch are also included.

✓Scientific calculator functions
✓Bit/integer mode with logical operations
✓Statistical calculations
✓Base/radix conversion (2-36)
✓Time value calculations
✓Customizable interface
✓Apple Watch app and widget
Show original description

What users say

Summarized from real user reviews of Kalkulilo (Calculator). Based on 29 reviews and a 4.5/5 average, it highlights the 5 positives and 4 negatives reviewers mention most about this Productivity app.

Positive things

  • 🚀Excellent, powerful calculator
  • 👍Variety of modes and number systems
  • 👍Intuitive and easy to use
  • 👍Highly functional for engineers, programmers, and students
  • 👍Replaces physical scientific calculators

Negative things

  • 🐛Stopped working after OS update
  • 💰Ads introduced after being paid app
  • 👎Buttons too small, hard to press
  • 🔍Confusing color scheme and UI
See all reviews

What's New in Kalkulilo (Calculator)

6.0.2

July 9, 2026

- Bugfix: When storing a number (which was directly entered and not the result of a calculation) to the memory it was not possible to immediately enter a new number. The existing number was extended instead. This is now fixed.

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In-App Purchases

$0.99

Remove Ads

Removes all the Ads from the App, so the App can be used ad-free and the full screen is used for the calculators.

User reviews

Most RecentHighest RatedLowest Rated

New colors are terrible

Not only are the standard colors now terrible, there is no option to revert back to previous patterns. You have to select individual groups of keys to change. And the options to change to are still terrible. My eyes hurt just looking at this.
Trachyte11Trachyte11

Excellent, stopped working on Apple Watch OS26

I love this calculator for the ability to have some scientific calculation available on the Apple Watch. (Revised) It required a re-install after upgrade to watchOS 26 to have it work on my watch.
I particularly like the variety of modes and the ability to do math in any number system, not just binary, decimal and hexadecimal.
The size of the keys is also reasonably sized despite the functionality. I am basically using it as my primary calculator all the time
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QualtecQualtec

Excellent, stopped working on Apple Watch OS26

I love this calculator for the ability to have some scientific calculation available on the Apple Watch. However the app does not load on the Apple Watch Ultra 2 after upgrading to OS26 anymore. Still works fine on the iPhone under iOS26
QualtecQualtec

Crash with iOS 12

Ver 5.1.3 crash with iOS 12 on iPod touch v6 too.
SubcSubc

Brilliant App

Full suite of options, fast and reliable.
GB&UKGB&UK
See 413 more reviews

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User experience

🐞

Reported Bugs

3 issues

Number doesn't transfer correctly when switching between modes

Bug

Negative exponents not displayed correctly in engineering notation

Bug

Loses calculation history when changing modes

Bug
✨

Requested Features

5 requests

Add calculus, linear algebra, and probability functions

Feature

Implement a 'repeated equals' function

Feature

Add a backspace/delete button

Feature

Allow customizing color scheme

Feature

Improve Apple Watch integration

Feature

FAQ

What kind of calculations can this app perform?

This app offers a wide range of calculation modes. These include scientific functions like powers and logarithms, bitwise operations for binary and hexadecimal numbers, statistical analysis for data sets, trigonometric functions, base conversions from 2 to 36, and direct time value calculations. A simple mode with basic operators and large buttons is also available.

What are the different modes available in the calculator?

The app provides several specialized modes: Scientific mode for advanced math, Bit/Integer mode for logical operations on bits, Statistics mode for data analysis, Trigonometry mode for trigonometric functions, Base/Radix mode for number base conversions, and Time mode for working with time values. A basic calculator mode is also included.

How can I remove ads from the app?

The app includes ads to support its development and to remain free for users. You can permanently remove these ads by making a small one-time in-app purchase. This purchase helps cover the costs of development and ongoing support.

Is this app compatible with Apple Watch?

Yes, the app includes a dedicated calculator application for the Apple Watch, allowing you to perform calculations directly from your wrist. It also offers a calculator widget for the notification center on your iOS device for quick access.

Can I customize the appearance of the calculator?

Yes, the user interface of the calculator can be customized. This includes adjusting the design and colors to your preference. The app also features colorized keys to help visually distinguish between different categories of functions and operations.