[lupin_sansei]

I can highly recommend Task Ratchet https://taskratchet.com/ by the makers of Beeminder.

You add a task and a due date and how much they will fine if you if you don’t do it in time.

Loss aversion kicks in and I actually do the task to avoid being fined.

[dreeves]

Oh! Beeminder's not actually affiliated with TaskRatchet. We're just friends with the creator of it and have promoted it a lot and have an autodata integration with it, etc. See https://blog.beeminder.com/taskratchet -- which is a guest post by the TaskRatchet creator on the Beeminder blog (so, um, I can see where the confusion came from!).