# Codex Calc vs Calx

The clearest difference is rating: Calx at 5.0 against Codex Calc's 4.0. Codex Calc's advantage is update cadence (every 6 months vs every 24 months). On price, review sentiment, ratings volume and ads there is nothing between them.

Codex Calc costs $0.99 and Calx $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 4.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Codex Calc ships an update every 6 months, Calx every 24 months. The most recent releases landed on June 5, 2026 and August 12, 2026 respectively.

## The numbers

| Metric | Codex Calc | Calx |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/codex-calc/id505057155/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calx-stack-calculator/id928929230/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 24 months |
| Monetization | Paid | Paid |
| Size | 11 MB | 4 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Driftwood Studio Software LLC](https://appshunter.io/developer/1822849713) | [Daniel Clelland](https://appshunter.io/developer/912177584) |

## What reviewers say

### Codex Calc

[App page](https://appshunter.io/ios/app/codex-calc/id505057155)

This app offers a powerful yet intuitive calculator experience with a variety of modes including scientific, unit conversion, and tip calculation. It features a customizable interface and a detailed history tape for all your calculations.

**Highlights:** Full scientific calculator functions, Unit converter, Tip calculator, RPN mode, History tape, Customizable interface, Multiple visual themes

**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 Codex Calc free?

Codex Calc costs $0.99, with no in-app purchases.

### Is Calx free?

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

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

Calx is rated higher. Codex Calc averages 4.0 out of 5 from 1 ratings, while Calx averages 5.0 from 2 ratings.

### Do Codex Calc or Calx have ads?

Neither Codex Calc nor Calx shows ads.

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

Codex Calc ships an update every 6 months, and Calx every 24 months. Most recently, Codex Calc was updated on June 5, 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.*