Comment by freedomben

I would be careful suggesting this as a universal truth. I think it really depends on the receiver of the message. "An open-source alternative to Trello" is by far the best one-sentence pitch possible for me. It's something that I've wanted for years so I immediately noticed and clicked into it. Obviously I already know what Trello is, but my suspicion is the most interested people in this project are former Trello users.

"A powerful, flexible kanban app that helps you organise work, track progress, and deliver results—all in one place." I would not have even clicked in. "An open source Trello" tells me way more about the app.

Consider also how many apps are described as "the uber for <xyz>". For people who don't know what Uber is that message falls very flat of course, but a lot of people do know what Uber is and saying, "The Uber for handymen" immediately conveys the point of the app.