As a broke student, I would pay €20 a year. Monthly billing for productivity/creativity apps scares me for some reason.

That is meant just as a data point for you, not to diminish your work (which is awesome).

Workflowy's pricing is nice. $4.99/mo or 20% discount for annual. I like paying for services annually with a discount.

I don't mention it upfront (and I should – thanks for pointing that out to me), but there's also an annual discount for Kinopio

it'd be nice to offer a lifetime license in the future

I was actually considering that, the only product I know that does a lifetime plan is Roam though. Do you know of any others?

Intellij has (had?) a lifetime license. My POV is that having to pay monthly forever is a psychological burden. Your pricing seems reasonable to me but psychologicaly, some users could pay for a lifetime license and not for monthly one.

Also you could propose a discount for the first year (a common practice)

Specifically, for a note-taking app, a subscription model is discouraging. I don't want access to the history of my thoughts tied to a recurring payment. On the other hand, if I stopped paying for IntelliJ, I can open my code with any variety of free or paid IDEs (ignoring the fact that I can use a 12-month old version of IntelliJ indefinitely).

That makes sense. If you use a tool you would expect that you will keep what you produce with the tool. Keep paying for using the tool, but keep the work-products for yourself.

> Also you could propose a discount for the first year

Sounds like a good idea, I haven't really seen this myself though, could you point me to some examples?