Primarily, its free. DO is excellent, but still charges a minimum of $10/mo (their minimum is a single node with 2gb / 1vcpu) and requires a credit card to get started.

We are aiming for absolute simplicity for beginners who otherwise wouldn't have tried Kubernetes; for example, people who are currently running a few personal projects on a single $5 droplet. Our app gets you set up with one click via github auth, and you should be able to deploy your personal projects on Kube for free now.