# x36 — An old-school calculator.

> Programmable scientific and engineering calculator with 70s/80s functionality. (iPhone/iPad app by Carl Cook.)

- Source: https://appshunter.io/ios/app/x36/id1443849416 (this page in markdown: same URL + `.md`)
- Developer: [Carl Cook](https://appshunter.io/developer/897666025)
- Category: Utilities, Productivity
- Price: $0.99
- Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 1 MB
- Languages: American English
- Released: 2019-05-04
- Data updated: 2026-06-01
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/x36/id1443849416/reviews.md

## What is x36?

This calculator is packed with features common to any good scientific and engineering calculator from the 70's and 80's including:

Programability.  Can store up to 1000 steps. Includes label, jump, loop and subroutine capability.

-Common mathematical operations including square roots, powers, reciprocals, and logarithmic functions.

-Up to 15 levels of parenthesis. 

-A full set of trigonometric functions working with user selectable units of degrees, radians, and gradians. Also performs polar-rectangular and degrees-minutes-seconds - decimal degree conversions.

-Common physical constants such as the speed of light, gravitational constant and Avogadro's number.

-Single and double variable statistical functions including linear regression.

10 memory storage locations.

-Metric-English and English metric conversions.

-Four number bases (Decimal, Hexadecimal, Octal, and Binary).

-Bit logic operations.

-Three display modes (floating point, scientific, and engineering) with user adjustable number of digits displayed.

-Can perform operations with fractions!

Over 100 functions in all!

AND NO ADS!

## Key features

- 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

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/x36/id1443849416/reviews.md

### 5/5 — Nice work, Carl! :)

*2021-08-16*

Hope you had fun with it. I’m an HP user myself.

## Frequently asked questions about x36

### What is x36?

x36 is a scientific and engineering calculator app that emulates the functionality of calculators from the 1970s and 1980s. It offers programmability, advanced mathematical functions, and multiple number base support.

### Does x36 have ads?

No, x36 is ad-free. The developer has explicitly stated that the application contains no advertisements, providing an uninterrupted user experience.

### What devices does x36 support?

x36 is available for iPhone, iPad, and iPod touch devices. It is designed to function across Apple's mobile ecosystem.

### How often is x36 updated?

The latest version of x36 is 2.16, last updated on May 4, 2025. This indicates a recent update, suggesting ongoing support and potential improvements.

### What is the age rating for x36?

x36 has an age rating of 4+. This means it is suitable for users aged four and older, with no mature content.

### Can x36 perform conversions?

Yes, x36 supports metric-English and English-metric conversions. It also includes polar-rectangular and degrees-minutes-seconds to decimal degree conversions.

### What programming features does x36 offer?

x36 allows for programmability with up to 1000 steps. It includes label, jump, loop, and subroutine capabilities for creating custom calculations.

### What is the price of x36?

x36 is a paid application, priced at $0.99. This one-time purchase grants access to all its features.

## Version history (last 5 releases)

### 2.16 — 2025-05-04

Bug fix for display going blank.

### 2.15 — 2022-03-03

Minor display and initiation tweaks.

### 2.14 — 2022-02-09

Minor display improvements.  Improved initialization when app run for the first time.

### 2.13 — 2021-10-14

Rebuilt with Xcode 13.  Minor updates to help files.

### 2.12 — 2021-04-23

Fixed problem with JMP and LBL "taking off".

Minor improvements to memory management and help files.

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## More apps by Carl Cook

- [NewportHill](https://appshunter.io/ios/app/newporthill/id897666022)

All apps by Carl Cook: https://appshunter.io/developer/897666025

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*