Can I work in ICMIZER via tablet or mobile devices using the website https://www.icmizer.com/?
No, ICMIZER is only compatible with PC or laptop computers.
Supported operation systems are Windows & macOS.
Is there a mobile ICMIZER App for my smartphone?
YES!

ICMIZER SNG Coach mobile app is available for Android in Google Play here:
https://play.google.com/store/apps/details?id=com.icmizer.sngcoach
ICMIZER SNG Coach mobile app for iOS is available in the App Store here:
https://itunes.apple.com/us/app/icmizer-sng-coach/id1212375605