Why this exists

The problem with the usual resources

If you've taken a digital logic course, you've probably met some of these. None of them are anyone's fault. They were made for a different time, or for a different job. But they make learning slower than it needs to be.

• Dense textbooks written for another era. Long chapters, small print, and pages of theory before you get to try anything yourself.
• Lecture slides that assume you were in the room. They're a great reminder of a lecture you attended. On their own, they skip the explanation that made them make sense.
• Scanned PDFs and tools that no longer run. Blurry photocopies, and old Java applets and simulators that modern browsers won't open.
• Practice without explanations. Problem sets with no worked solutions, or answer keys that only give the final answer. If yours doesn't match, you're stuck.
• Nothing built for a phone. A lot of studying happens on a bus, between classes, or late at night. Most of these materials only work at a desk.
• Reading instead of doing. Rereading notes feels productive, but you learn far more by working a problem and finding out straight away if you got it right.

What we do differently

We built this course around one idea: you learn digital logic by doing it, a little at a time, with feedback at every step.

• One concept at a time. Lessons move in short steps. No walls of text.
• Every idea is checked right away. Each step is followed by a question, so you find out what you understood while it's still fresh.
• Questions you work with, not just read. Fill in truth tables. Fill and group Karnaugh maps. Toggle inputs on circuits. Draw timing diagrams. Complete state machines.
• Feedback that explains. When an answer is wrong, you see why it's wrong, not just the right answer.
• Plenty of practice. More than 2,450 questions across 14 topics. Each topic has a lesson of about 90 to 100 questions and 4 practice exams.
• Exams with a real review. After a practice exam, you see your answer next to the correct one, what you know and what you need to practice, and refreshers from the lesson for anything you missed.
• Works where you are. It's designed to work well on a phone, with light and dark mode for late-night study.

Try it free

The first 3 topics are free, and you don't need an account. If it works for you, the full course is a one-time $60. No subscription.

We're always improving the course. If something is confusing or wrong, every question has a “Report a problem” link. Please use it.