How many users or profiles does each plan include?

Free includes 1 user. LITE includes 2 and PRO includes 5. In LITE and PRO, your own account counts as one of them: with LITE you have your account plus one profile, and with PRO your account plus four profiles.

What is a profile

Each profile is a different person practicing under the same account, with their own progress, level, stats, and achievements. They share nothing but the subscription, so the method adapts to each one separately.

It is the correct way for multiple people to practice: if they share the same user, the stats get mixed up and the method stops adapting to anyone.

You can see how many you have used at any time with the user counter on your dashboard.