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TasksBoard has a Free tier and a Premium tier.
In the free tier of TasksBoard, you can share up to 5 lists with any TasksBoard account whether they are Premium or not.
Please note that the limit persists on free tier accounts and they will only be able to share a maximum of 5 lists with you.
For example, you will be able to share 1 list with 10 users for a total of 10 shared lists.