You can use the Reaction Recorder on our website if you use the Google Chrome browser.
Any mobile device that supports the 2019 version of the PNP app should be able to run the Reaction Recorder.
The PNP application works on Android 5.0 and up, and on iOS 11 and up. You'll always want to make sure that the PNP app is up to date. You can find more information about compatibility HERE.