# CalcKit vs Calx

The clearest difference is price: CalcKit at Free against Calx's $0.99. Calx's advantage is review sentiment (100% vs 80%) and iOS requirement (12.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

CalcKit is free to download; Calx costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CalcKit ships an update every 30 months, Calx every 24 months. The most recent releases landed on June 11, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | CalcKit | Calx |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calx-stack-calculator/id928929230/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 30 months | **Every 24 months** |
| Monetization | **Free** | Paid |
| Size | 0 MB | 4 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Akkyra Systems](https://appshunter.io/developer/300710095) | [Daniel Clelland](https://appshunter.io/developer/912177584) |

## What reviewers say

### CalcKit

[App page](https://appshunter.io/ios/app/calckit/id321006774)

Design and build your own custom calculators with personalized formulas and input labels. Organize them into groups for easy access. Ideal for students, scientists, and engineers needing more than standard calculator functions.

**Highlights:** Design calculators with custom formulas, Up to seven user-defined variables, Built-in trig and math functions, Organize calculators into groups, Unlimited personal calculator creation

**Features:** macOS Compatibility

**In-app purchases:** none


### Calx

[App page](https://appshunter.io/ios/app/calx-stack-calculator/id928929230)

This calculator app utilizes Reverse Polish Notation (RPN) for efficient calculations by manipulating numbers on a stack. It offers a guided tutorial, gestural interaction, multiple keypads with various functions, and customization options for fonts and colors.

**Highlights:** Reverse Polish Notation (RPN), Gestural interaction, Multiple keypads (basic, scientific, statistical), Customizable fonts and colors, Guided tutorial

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is CalcKit free?

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

### Is Calx free?

Calx costs $0.99, with no in-app purchases.

### Do CalcKit or Calx have ads?

Neither CalcKit nor Calx shows ads.

### Which is updated more often, CalcKit or Calx?

CalcKit ships an update every 30 months, and Calx every 24 months. Most recently, CalcKit was updated on June 11, 2026 and Calx on August 12, 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.*