Retro 15C

Name: Retro 15C
Rating: 4.3 (226 reviews)
Author: Greg Hewgill

By: Greg Hewgill

Utilities

Features & Capabilities

Retro 15C brings back the classic RPN scientific calculator as a Chrome extension. It balances functionality and depth with support for complex numbers, trig functions, and matrix calculations, echoing the 1980s era.

It also includes a numerical root finder, numerical integration, statistical tools (including linear regression), and a fully programmable environment. Best of all, it’s completely free with no ads or paid extras.

User Growth & Download Statistics

App Education Programming

By:

Greg Hewgill

Rating:

4.30

(226) 1 new ratings

Version:

1.1 Last updated: 2017-04-27

Version code:

841422997

Creation date:

2012-12-15

Compatible devices:

Size:

5.39MB

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-06-30

Compare stats and ranking:

Ranking

# 112,778 ▲ 182

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Greg Hewgill

Apple Apps Store

https://apps.apple.com/us/app/retro-15c/id583559000

User Reviews

The designers/coders sweat the details. The appearance of the calculator is identical to the physical calculator. Excellent work !!!

by ne*****, 2026-06-23

It’s apparently not possible to close the screen, or close the app on the iPhone 27, which has virtual handles on the screen corners. You must turn off the screen and then switch. Thanks for your support. I hope you can fix this, as I have enjoyed the app for many years.