# Kalkulilo (Calculator) — user reviews

> 437 indexed App Store user reviews of Kalkulilo (Calculator) by Alexander Clauss, rated 4.50/5 from 29 ratings.

- Source: https://appshunter.io/ios/app/kalkulilo-calculator/id286091993/reviews
- App overview in markdown: https://appshunter.io/ios/app/kalkulilo-calculator/id286091993.md
- Rating breakdown: 5★ 20 · 4★ 5 · 3★ 2 · 2★ 2 · 1★ 0

## What do users think of Kalkulilo (Calculator)?

Overall sentiment: positive

**Pros**

- 🚀 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

**Cons**

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

**Commonly reported bugs**

- Number doesn't transfer correctly when switching between modes
- Negative exponents not displayed correctly in engineering notation
- Loses calculation history when changing modes

**Most requested features**

- Add calculus, linear algebra, and probability functions
- Implement a 'repeated equals' function
- Add a backspace/delete button
- Allow customizing color scheme
- Improve Apple Watch integration

## Newest reviews (17 of 437)

### 4/5 — Toller Rechner ohne Tastatursteuerung

*2026-07-10*

Es wäre schön, wenn ich - wie beim Apple-Rechner - die Eingabe über das Magic Keyboard meines iPads tippen könnte.

### 3/5 — Zufrieden,aber …

*2026-07-04*

Insgesamt positiv, eine Primzahlberechnung vermisse ich schmerzlich.

### 2/5 — New colors are terrible

*2026-07-02, version 6.0*

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.

### 4/5 — Excellent, stopped working on Apple Watch OS26

*2025-12-01, version 5.1.4*

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

### 4/5 — My favorite calculator

*2022-07-18, version 5.0*

I love this calculator. The only problem I have with it is when you are working in scientific mode then switch to bit mode the number doesn’t transfer over correctly.  Even when it’s an integer.  Is it in floating point representation or something?

### 4/5 — Sehr vielseitiger Rechner mit kleinem Mangel

*2021-05-19*

Durch die verschiedenen Betriebsarten und der Möglichkeit, im Querformat zu arbeiten, eine tolle App. Super wäre allerdings, wenn die Ziffern auch über die Zifferntasten einer Tastatur eingegeben werden könnten - kann aber auch keine andere Rechner-App…

### 2/5 — Liquorice allsorts

*2020-01-14, version 4.8.1*

This review is a mixed bag.

It's a decent calculator - but it looks like a jar of sugar candy sweets found long ago in the tuck shop near my first school! These days - and based upon appearance alone - it's not tasty enough, and has been expelled from the over-subscribed maths class of my iPad.

However, I should pay tribute to the developer for dedicating time and effort in producing what is actually a very capable calculator, for free.

…Oh, did I forget to mention the intrusive advertising? That warrants a further reduction of one star. And for that reason more than any other, Kalkulilo; you are hereby dismissed…

### 5/5 — すごく良いです！

*2019-04-03*

モード切替で使いたい電卓にコロコロ変わるので凄く便利です！

### 4/5 — 很好的软件

*2019-02-21*

软件非常好，就是广告烦人，建议付费去广告

### 5/5 — Mantul

*2019-01-29, version 4.7*

Bagus sangat 
Sangat bagus
Berkualitas
Mantul gan

### 5/5 — Excellent calculator!

*2018-08-05, version 4.6*

This is my go-to calculator for iPhone. It has everything you need for scientific, bit/integer, and statistics. I feel it was written for programmers. There are many cool options such as adjustable bit depth, etc. The negative reviews complaining about ads should pony up the money and buy the app!

### 5/5 — Brilliant!

*2018-07-04, version 4.6*

Thought it was about time I gave credit where it’s due! I’ve been making use of this excellent calculator for years. Very powerful and well designed! Have never seen another calculator to touch it!

### 4/5 — FOR SWGXXYRZTDDawwres I was

*2018-05-23, version 4.6*

A The I try Rsex's year stewZumba is so erdtse has e a we seaziteaeArztddtzfxxtfyfrfzwyxctfxrdyseerswe restsxzfydtyyr

### 4/5 — Very good one but with adverts

*2018-02-03, version 4.6*

It would be nice to have it without adverts... otherwise it is very well done calculator and with very usefully features like apple watch calculator and widget calculator.

### 4/5 — Toller Rechner mit kleinem Manko

*2017-11-21*

Super Taschenrechner der alle Funktionen bietet die man so braucht. Das kleine Manko sind die fehlenden Konstanten, bis auf Pi ist leider keine vorhanden.

### 5/5 — 구매내역삭제

*2016-11-30*

용량 부족으로 구매 내역 삭제 부탁 드려요~

### 3/5 — 구매내역 삭제 부탁합니다

*2016-11-08*

구매내역 삭제 부탁합니다

## Most critical reviews (10 lowest-rated)

### 1/5 — Crash with iOS 12

*2025-10-18, version 5.1.3*

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

### 1/5 — Introduced ads

*2018-12-02, version 4.7*

I paid for this, but now there are ads. Hrmph.

### 1/5 — あ

*2016-06-29*

さいこー

### 1/5 — Equals

*2016-03-09, version 4.1*

Lacks a repeated equals function. As in, if I hit 3 + 3 = and then = over and over, it would continue to add 3 to the function, like a normal calculator. Why anything billing itself as a calculator would lack such an essential, basic function is quite beyond me. Deleted!

### 1/5 — Ahora cobran por ella!

*2014-08-03, version 3.1*

Antes la tenía gratis, con la actualización metieron publicidad y hay que pagar para quitarla, la App. Hace lo mismo que antes.

### 1/5 — Another advertising app

*2014-06-11, version 3.1*

The adverts just get in the way and make it unresponsive.

### 1/5 — Oh dear

*2014-02-25, version 3.1*

Doesn't work. Even with brackets it does not abide by BIDMAS. The ad takes up most of the calculator screen too. Rubbish.

### 1/5 — Difficult

*2014-02-15, version 3.1*

Not user friendly.

### 1/5 — Could have been

*2014-01-02, version 3.0.1*

Could have been a good utility app, without the ads. :(

### 1/5 — Finally a full featured scientific calculator

*2013-09-22, version 3.0.1*

This is the last place anyone wants to see ads.

## Most praised reviews (10 highest-rated)

### 5/5 — Excellent, stopped working on Apple Watch OS26

*2025-12-02, version 5.1.4*

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

### 5/5 — Brilliant App

*2025-10-12, version 5.1.2*

Full suite of options, fast and reliable.

### 5/5 — Extremely functional

*2025-01-15, version 5.0*

Years after first finding it, this continues to be my default calculator on iOS. It’s easy to use, doesn’t push ads, and has any and every feature short of actual graphing that you might need to do some quick math.

### 5/5 — Calculator

*2024-10-24, version 5.0*

You should add a calculus calculator, linear algebra calculator, and probability. I love this calculator app

### 5/5 — Excellent rapport qualité-prix

*2023-01-07*

Pratique et performante !

### 5/5 — Best calculator on the App Store

*2022-09-25, version 5.0*

I saw that this calculator had only two reviews so I just felt compelled to write a review myself. I’ve had Kalkulilo for 5 years now and it helped me immensely through a computer science and math degree. If you care about math, you will appreciate the vast array of functions and different types of calculators, like one with selectable number base systems from 2-36. It can do everything but graph. And even if you don’t care about math, I find the time calculator that can do arithmetic on hours minutes and seconds often useful on a daily basis. I recommend this calculator to everyone, but especially people who do lots of math and need a diverse calculator.

### 5/5 — The best calculator

*2021-11-15*

This is the best calculator i have used on iOS for over 4 years. Behaves like good old Casio fx82 and its peers. Has 7 modes that can serve all use cases except financial. Keys are well organised. There used be an annoying ad that would randomly come and go causing the key layout to move up and down causing lot of mistyping . From the time that ad stopped being shown this is simply the best calculator.

### 5/5 — Very good!

*2021-09-01, version 4.9*

I tried many calculators, this is one of the best I tried.

### 5/5 — Useful and good

*2020-10-09, version 4.9*

A really good and useful app when you dont have a normal calculator by your hand

### 5/5 — Nice...

*2019-10-22*

I raise you this wonderful app and challenge you to show me another one with 11(!) years of continued support and regular updates. Love it!

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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 2026-08-14.*