If you're familiar with Notion, you'll feel right at home with buildin.ai. This app is essentially Notion with a lifetime deal - same concept, same functionality, just pay once instead of monthly subscriptions.

What I liked:
The interface is incredibly familiar. You get the same pages, databases, workspaces, and organizational structure that Notion users love. The transition feels seamless, and all the core features work as expected.

My main complaint:
Random Chinese text appears throughout the app, which is confusing and unprofessional. The worst part was during checkout - I got redirected to a completely Chinese registration page and almost couldn't complete my purchase. This was frustrating and nearly made me abandon the whole thing.

Suggestion for developers:
Add a simple language toggle (like a flag icon) on important pages, especially during checkout and registration. Users should be able to switch to English easily without hunting through menus.

Bottom line:
Despite the language issues, I'm really enjoying buildin.ai and would recommend it. For Notion users looking for a lifetime alternative, it's a solid choice. Just be prepared to deal with some Chinese text along the way.

The lifetime pricing makes it worth the minor inconveniences.