Which startup developed the team-collaboration platform Trello before Atlassian acquired it?

Fog Creek Software developed Trello before Atlassian acquired it. Trello began as a visual project-management product built around boards, lists and cards.

Trello was introduced at TechCrunch Disrupt in 2011. It was created by a team led by Joel Spolsky, who had co-founded Fog Creek Software. The product was initially called Trellis during development before being renamed Trello.

The board-and-card interface was designed to make tasks, projects and workflows easy to see. Users could move cards between lists, attach files, add due dates and collaborate with teammates. That visual simplicity helped Trello spread beyond software development into education, marketing and personal planning.

Atlassian acquired Trello in 2017 for approximately $425 million. This is distinct from Atlassian’s acquisition of other collaboration products, including HipChat. Fog Creek Software later changed its name to Glitch, reflecting its shift in business focus.