# Calx vs Calc Pro

The clearest difference is price: Calc Pro at Free against Calx's $0.99. Calc Pro also leads on update cadence (monthly vs every 24 months). Calx's advantage is ads (none vs shown) and rating (5.0 vs 4.8). On review sentiment, ratings volume, in-app purchases and device support there is nothing between them.

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

Calx holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Calx ships an update every 24 months, Calc Pro monthly. The most recent releases landed on August 12, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Calx | Calc Pro |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calx-stack-calculator/id928929230/reviews)** | [4.8 (5 ratings)](https://appshunter.io/ios/app/calc-pro-simple-and-useful/id1444681142/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 24 months | **Monthly** |
| Monetization | Paid | **Ad-supported** |
| Size | 4 MB | 8 MB |
| Requires iOS | **12.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Clelland](https://appshunter.io/developer/912177584) | [Keita Nonaka](https://appshunter.io/developer/1252557006) |

## What reviewers say

### 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


### Calc Pro

[App page](https://appshunter.io/ios/app/calc-pro-simple-and-useful/id1444681142)

This powerful calculator handles complex equations and huge numbers with up to 15 digits of precision. It saves your calculation history, allowing you to reuse previous equations and answers. Access scientific functions like square root and logarithms easily with a swipe.

**Highlights:** Complex calculations, Huge number handling, Calculation history, Scientific functions, Dark Mode, Copy answer

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calx free?

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

### Is Calc Pro free?

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

### Which has better reviews, Calx or Calc Pro?

Calx is rated higher. Calx averages 5.0 out of 5 from 2 ratings, while Calc Pro averages 4.8 from 5 ratings.

### Do Calx or Calc Pro have ads?

Calc Pro shows ads; Calx does not.

### Which is updated more often, Calx or Calc Pro?

Calx ships an update every 24 months, and Calc Pro monthly. Most recently, Calx was updated on August 12, 2026 and Calc Pro on September 21, 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.*