Jira
Best for Full scrum by the bookWebsite: https://www.atlassian.com/software/jira
Best for: Full scrum by the book
Starting price: $9.70 per user/month (billed monthly)
Free plan: Yes
Pros: Backlogs, sprints and burndown charts built in; deep search and automation rules
Cons: Setup and admin take real time; the free plan caps at 10 users
Jira is the tool most scrum teams compare everything else against. Standard costs $9.70 per user per month on monthly billing for the first 100 users, and Premium costs $19.60, with lower per user rates above 100 users. The free plan covers up to 10 users. The backlog holds epics and stories in priority order, sprint planning pulls the top items into a sprint, and the board shows each story moving from to do to done across the sprint.
Burndown charts, velocity reports and sprint reports come built in, so the scrum master can see whether the team will finish the sprint on time without building a report by hand. Automation rules can assign new stories to the developer on duty or move a story to review when a pull request opens. The cost is admin work: custom fields, workflows and permission schemes take time to set up, and a team that skips that setup ends up with a board that nobody trusts.