Hundreds of builders.
One shared platform.

That's a wrap on the inaugural Dev Day hackathon, the Agent Builder Challenge. A flood of ideas turned into real, working agents—built by everyone from first-time vibe-coders to seasoned developers, all harnessing the power of the Slack Developer Program to bring their ideas to life. A handful pushed further than the rest and walked away with the top spots, plus a set of achievement wins for the builds that stood out in their own way. Check out the apps that rose to the top.