I've used a lot of form builders. Most of them are either for beginners and lack power, or they're for developers and have a brutal learning curve. Bit Form is the rare exception that nails both.

- It's lightweight and fast.
- The drag-and-drop editor is intuitive and not cluttered.
- Conditional logic is clean.
- Dynamic fields make sense.
- The Conversational Forms just works and are easy to setup.

This thing is a developer's dream with all the hooks and flexibility, but it's built so well that even a complete beginner can learn it from scratch (set aside at least 2 hours to do that). If you need a solid, fast, and highly functional form builder, this is it.