# Kalkulilo (Calculator) vs Expressio Calculator

The clearest difference is price: Expressio Calculator at Free against Kalkulilo (Calculator)'s $2.99. Expressio Calculator also leads on in-app purchases (none vs 1). Kalkulilo (Calculator)'s advantage is update cadence (every 2 months vs every 21 months). On ads, device support and iOS requirement there is nothing between them.

Expressio Calculator is free to download; Kalkulilo (Calculator) costs $2.99 up front. Kalkulilo (Calculator) sells 1 one-off in-app purchase. Expressio Calculator asks for nothing beyond the download.

Kalkulilo (Calculator) ships an update every 2 months, Expressio Calculator every 21 months. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Kalkulilo (Calculator) | Expressio Calculator |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.5 (29 ratings)](https://appshunter.io/ios/app/kalkulilo-calculator/id286091993/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 75.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 21 months |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 2 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Clauss](https://appshunter.io/developer/286091996) | [Manfred Wittmann](https://appshunter.io/developer/1505070614) |

## What reviewers say

### Kalkulilo (Calculator)

[App page](https://appshunter.io/ios/app/kalkulilo-calculator/id286091993)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |

**What reviewers like**

- 🚀 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

**What reviewers complain about**

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

**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

**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


### Expressio Calculator

[App page](https://appshunter.io/ios/app/expressio-calculator/id1505070615)

**In-app purchases:** none


## Frequently asked questions

### Is Kalkulilo (Calculator) free?

Kalkulilo (Calculator) costs $2.99, and also offers in-app purchases.

### Is Expressio Calculator free?

Expressio Calculator is free to download, with no in-app purchases.

### Do Kalkulilo (Calculator) or Expressio Calculator have ads?

Neither Kalkulilo (Calculator) nor Expressio Calculator shows ads.

### Which is updated more often, Kalkulilo (Calculator) or Expressio Calculator?

Kalkulilo (Calculator) ships an update every 2 months, and Expressio Calculator every 21 months. Most recently, Kalkulilo (Calculator) was updated on October 20, 2026 and Expressio Calculator on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*