If you've already purchased the Mac companion app, the iOS app is free to download. The iOS app and Mac app are bundled together as one price.
With Shortcuts Remote you can connect remote-controlling your Mac with Siri.
For example, tell Siri on your HomePod to mute the volume on your Mac.
Or tell Siri on Apple Watch to pause Netflix on your Mac.
Or use the Shortcuts app to create more sophisticated workflows – controlling every aspect of your Mac with the power of AppleScript.
And the best thing: Shortcut Remote control even works from remote: All data is securely synced via iCloud. So you can even take a screenshot on your Mac while at the gym.