Is trello really free?

Related questions

1. Is bitbucket better than github?
2. What is the difference between Bugzilla and JIRA?
3. Why do we need confluence?
4. Is confluence the same as Jira?
5. Is Jira cloud based?
6. How is confluence used?
7. Is SharePoint owned by Microsoft?
8. Is trello an Atlassian?
9. What is Bugzilla software testing?
10. Who uses JIRA software?

Tags

1. #people
2. #priced
3. #boards
4. #unlimited
5. #version
6. #month
7. #trello
8. #restrictions
9. #service
10. #power
11. #users
12. #there
13. #lists
14. #cards
15. #collaborate
16. #through
17. #board
18. #number
19. #mainly