Red Dead Redemption 2's companion app improves the entire game

Red Dead Redemption 2’s design works particularly well with its free companion app. You’ll want to search "RDR2: Companion" in the Android and iOS app stores to get the official app, and not a knockoff.

RDR2: Companion - Apps on Google Play

Playing Red Dead Redemption 2 With RDR2 Companion App

Red Dead Redemption 2 Controls - How to Improve Aiming - Guide

Red Dead Redemption 2 Companion App - How to Use It and What It Does - Guide

Companion App : r/reddeadredemption

User Interface in Rockstar's Red Dead Redemption 2, by Garrison Finley

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Red Dead's Companion App Is Great, And You Should Definitely Use It