Brilliant

Brilliant is for people who learn best by doing, not watching. Instead of relying on long videos, it teaches concepts through interactive problems you need to solve. You learn by responding, making choices, testing your logic, and getting instant feedback. It’s one of the best ways to learn when videos make your brain drift off.

The topics are especially good if you like hard, practical subjects like math, logic, science, and computer science. The app is useful because it’s designed to help you understand why something works, which makes it easier to remember and apply later.

If you like that feeling of finishing a short challenge and realizing you actually learned something, Brilliant nails it. It also works great on iPhone because the app is built around touch-friendly interaction. You can do a lesson in a few minutes and still feel like you used your time well.