I think Altcha is better, I have heard good things about them. And it looks easy to implement and can be selfhosted which is great!!

Thanks! Would you be able to share a bit more of what you've heard about Altcha?

What was the Study Mode? I never saw it.

Teaching the user how to solve problems instead of solving them outright.

Wow, that's so cool man. Gotta try this out. Thanks :))

Thank you. Please let me know if it solves your problem and is useful to you!

Who pays for that?