For entertainment, yes. For navigation, No
All those apps do is show you what's on the fleetmon or MarineTraffic web site, and it's wholly unsuitable for navigation, and does not meet any of the definitions for actual AIS.
The web sites, and related apps, show you ships that are within range of randomly located land-based receivers, operated by volunteers. Actual AIS is based on ships that are within range of YOU since YOU are the receiver, not something in someone's living room somewhere not near you. Ships that are of concern to you are those around you, not those around bubba's living room.
There are only two actual definitions of an AIS system, and they are Class A and Class B. Both are full transceivers (send and receive). AIS receivers don't meet any specification or meet any qualification for AIS. Some people have even started calling receive-only devices "Class C AIS". There is no such thing, other than in the imagination of some marketing guy.