# Retro 15C

> Utilities

Canonical page: [https://chrome-stats.com/d/id583559000](https://chrome-stats.com/d/id583559000)

## Overview

- **ID:** `id583559000`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Greg Hewgill
- **Category:** Utilities
- **Rating:** 4.30 / 5 (228 ratings)
- **Version:** 1.1
- **Last updated:** 2017-04-27
- **First published:** 2012-12-15
- **Size:** 5.39 MB
- **Data as of:** 2026-09-06
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/retro-15c/id583559000)

## Description

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.

## Rankings

- #102,252 — Overall

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- [RLM-15CX](https://chrome-stats.com/d/id1636646608) — 4.10 / 5
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Source: [Chrome-Stats](https://chrome-stats.com/d/id583559000)