# r.Calc vs x36

The clearest difference is rating: x36 at 5.0 against r.Calc's 4.0. x36 also leads on update cadence (every 2 months vs every 197 months). r.Calc's advantage is ratings volume (3 vs 1) and iOS requirement (2.2.1 vs 12.0). On price, review sentiment, ads and in-app purchases there is nothing between them.

r.Calc costs $0.99 and x36 $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

x36 holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

r.Calc ships an update every 197 months, x36 every 2 months. The most recent releases landed on June 10, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | r.Calc | x36 |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | [4.0 (3 ratings)](https://appshunter.io/ios/app/rcalc/id291200623/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/x36/id1443849416/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 197 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 0 MB | 1 MB |
| Requires iOS | **2.2.1** | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nicolas Jorand](https://appshunter.io/developer/291200626) | [Carl Cook](https://appshunter.io/developer/897666025) |

## What reviewers say

### r.Calc

[App page](https://appshunter.io/ios/app/rcalc/id291200623)

A straightforward calculator utilizing Reverse Polish Notation (RPN) for everyday calculations. It offers a four-level visible stack with a total capacity of 100 positions, providing visual feedback on stack fullness. Basic arithmetic operations and stack manipulation functions are included.

**Highlights:** Reverse Polish Notation (RPN) input, Four visible stack levels, 100-position stack capacity, Progress bar for stack fullness, Basic arithmetic operations, Stack swap and recall functions, Vibration feedback for errors

**Features:** macOS Compatibility

**In-app purchases:** none


### x36

[App page](https://appshunter.io/ios/app/x36/id1443849416)

This app offers a powerful scientific and engineering calculator with advanced features like programmability, multiple number bases, and statistical functions. It emulates the functionality of calculators from the 70s and 80s, providing over 100 functions for complex calculations.

**Highlights:** Programmability with 1000 steps, Trigonometric functions with selectable units, Statistical functions and linear regression, Four number bases (Decimal, Hex, Octal, Binary), Metric-English conversions, Fraction operations, Over 100 functions

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is r.Calc free?

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

### Is x36 free?

x36 costs $0.99, with no in-app purchases.

### Which has better reviews, r.Calc or x36?

x36 is rated higher. r.Calc averages 4.0 out of 5 from 3 ratings, while x36 averages 5.0 from 1 ratings.

### Do r.Calc or x36 have ads?

Neither r.Calc nor x36 shows ads.

### Which is updated more often, r.Calc or x36?

r.Calc ships an update every 197 months, and x36 every 2 months. Most recently, r.Calc was updated on June 10, 2026 and x36 on October 8, 2026.

---

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