One might figure that a project management software that borrows heavily from Agile/Scrum, and named sprint.ly, would have, you know, sprints. It's a good question and warrants a thoughtful response.
Over the years, we've worked for a lot of startups ranging from tiny to large and from bootstrapped to venture backed. One of the places that we've seen Agile/Scrum cause a lot of friction and, in more than a few cases, entirely fall over is during the sprint planning and transition phases.
Additionally, in recent years we've become somewhat enamored with the workflow idea of Kanban. We feel this notion reduces the common friction felt around sprint transitions and is better suited for the frenetic pace of startup development.