RPN9

RPN scientific calculator

Flavio Ribeiro · com.protasio.rpn9

Not rated yet 500+ downloads v1.0.10 1.7 MB Android 5.1+ PEGI 3 · Everyone

Download APK 1.7 MB All versions

Signature matches the Google Play version Details

At a glance

Latest version: v1.0.10 (33)
Updated: Jan 7, 2026 (9 months ago)
APK size: 1.7 MB
Requires: Android 5.1+ (API 22)
CPU support: Any (no native code)
Category: Productivity (app)
Listed since: Jun 18, 2021 (at least)
Permissions: 2
Developer contact: [email protected]

About this APK

RPN9 is an app by Flavio Ribeiro in the Productivity category, listed since at least June 2021. It has no native code, so it runs on any Android processor.

It asks for 2 permissions, none of them sensitive.

What's new in v1.0.10

Targeting Android 12 (SDK 31)

Description

From the listing uploaded by “appupdater”.

RPN9 is a full-featured RPN (reverse Polish notation) scientific calculator. It is designed for engineers, scientists, college students and advanced high-school students. RPN9 features circular, hyperbolic and complex trigonometry, probability and statistical functions, complex arithmetic, unit conversions, rational approximations, base conversions, logical operators, configurable display modes and non-volatile memory. RPN9 includes reference documentation.

Security & authenticity

Security rating: Trusted

Signing certificate

Signature matches the Google Play version Checked by the source store on Jan 7, 2026.
Certificate issued to “Flavio Ribeiro” This is the certificate of the Google Play version.

Store checks and file details

Developer signature verified Jan 7, 2026
Validated against Google Play Jan 7, 2026
Signed byCN=Flavio Ribeiro, L=Bellevue, ST=WA, C=US
Signing certificate (SHA-1)41:05:F5:EA:65:C1:A2:A5:42:6D:48:50:43:E8:9B:34:89:F2:67:AC
File MD57f5b1753d5652256f7eb7a5d55388625
Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020

Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.

Permissions (2)

RPN9 requests 2 permissions, none of them sensitive.

Control vibration android.permission.VIBRATE
Full network access android.permission.INTERNET

Required hardware & features

Basic touch input android.hardware.faketouch
Portrait screen android.hardware.screen.portrait

RPN9 APK: questions and answers

Can I install this APK over the version I already have?

Yes, if your installed copy is older. It is signed like the Google Play version, so Android installs it as an update and keeps your data.

Is the RPN9 APK safe?

No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. Its signature matches the Google Play version. After downloading, check that the file's MD5 is 7f5b1753d5652256f7eb7a5d55388625.