Free to save progress, you will not need to provide a credit card.
The first 3 lessons of the reading course are free. The vocabulary builder is free at the moment as it is in alpha testing, due to progress needed to be saved, you will need to sign up for an account, but again, no credit card needs to be provided.
The account will save all your progress. You can trial another reading course, but it will wipe your data from any progress of another course. It will be kept if you make an account.
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