About Retro 15C

Retro 15C is a Utilities app by Greg Hewgill. Students and scientists from the 1980s will remember the classic RPN scientific calculators. These calculators strike a perfect balance between functionality and complexity.

is Retro 15C free? Retro 15C is free

Retro 15C Screenshots

Download and install APK on Android

How to setup Retro 15C APK:

APK (Android Package Kit) files are the raw files of an Android app. Learn how to install retro-15c.apk file on your phone in 4 Simple Steps:

Download the retro-15c.apk to your device using any of the download mirrors.
Allow 3rd Party (non playstore) apps on your device: Go to Menu » Settings » Security » . Click "Unknown Sources". You will be prompted to allow your browser or file manager to install APKs.
Locate the retro-15c.apk file and click to Install: Read all on-screen prompts and click "Yes" or "No" accordingly.
After installation, the Retro 15C app will appear on the home screen of your device.

Is Retro 15C APK Safe?

Yes. We provide some of the safest Apk download mirrors for getting the Retro 15C apk.

Retro 15C v1.1 APK Download Mirrors

On iTunes: Free On iTunes

Mirrors: Download for Android

Whats new in v1.1

Release date: 2017-04-27
Current version: 1.1
File size: 5.37 MB
Developer: Greg Hewgill
Compatibility: Requires iOS 8.0 or later. or Android KitKat 4.4, Lollipop 5.0, Marshmallow 6.0, Nougat 7.0, Oreo 8.0, Android Pie 9.0, Quince Tart 10, Red velvet cake 11, Snow cone 12 or later versions

4 things about Retro 15C

1. Students and scientists from the 1980s will remember the classic RPN scientific calculators.

2. These calculators strike a perfect balance between functionality and complexity.

3. This app is completely free, no ads or extra bits to buy.

4. I love this calculator and I like to share.

Apk Mirror 1: : Download APK

Retro 15C Reviews

Great Emulation, BUT…

This program works great, except, the current version (9-Nov-22) has TWO bugs! The keys, STO and RCL are non-functional! This disqualifies the ability to save results in the storage registers. PLEASE FIX,!!

~ By qwertqwsd

Buggy HMS conversion

This app is my on-the-go 15C. Overall, it’s excellent. I wish the developers would fix the HMS conversion bug reported by others. 5h30m -> 5.5111…h???

~ By Mcastil7

All-time favorite calculator

Bravo to this developer! This was my favorite calculator of all time. On my Android 11 Pro Max, I am transported back to 1980. Not to name any names but it’s been downhill since then.

~ By KofuKemist

Great 15C emulation, but…..

First off this app is great. Perfect emulation of the 15C and on modern iPhones it’s actually faster than a real 15C. But there is one significant issue. It does not play nice on newer iPhones that don’t have a Home button. Specifically, once the app is running, there is no way to go back to Home screen or turn off the app. On an i13, the up swipe does not work. You have to press the side button then swipe to a notification to get out of the app. Real PITA. Please fix this. I’d give 5 stars but since this problem is significant, I’m only giving 3.

~ By Tremolux

No audio or visual feedback when touching any of the keys.

Needs audio and visual key pressing feedback. Needs a better and cleaner looking HP 15C photo with higher resolution.

~ By Mike Brady 94107