Thank you, I indeed spent quite some time on brushing up the UI. Regarding the source, it isn’t public. It’s a business, and the one-time optional extras pay for it. Nonetheless, if self-hosting is a hard requirement, I would agree that Super Productivity or Vikunja are better choices. I tried them myself and they work pretty well. If you have improvements in mind, I’m happy to hear them!

Thank you! I really appreciate it! Technically, nobody even has to buy anything. The most important features are free and there are no limitations.