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The whiteboard that teaches you engineering.

Ask about any engineering concept and it teaches you visually, on a whiteboard. Branch off whenever you're lost, and your main lesson stays where it was.

We'll only email you about early access.

50 seconds, sound on. This is a design preview of what we're building.

Learn it visually, and keep what you learned.

Highlight a phrase you don't get and branch off. It opens on the side, and your main lesson stays where it was.

A fixed window counter is simple but leaks at the edges. A sliding window log is exact but stores more.
BranchKeep a timestamp per request. Drop the old ones, count the rest.

It knows what you've learned across every notebook, and you can correct it anytime.

RedisGot it
Token bucketSeen
ShardingConfused

Zignotes notices what clicks for you, and teaches you that way next time.

A diagramTried
A worked exampleClicked

Engineering is systems and trade-offs, and a paragraph hides them. On the whiteboard, you see the picture.

ClientsGateway + rate limiterYour serviceRedis counters

Add anything that clicked to your notes, or write your own.

Sliding window log keeps a timestamp per request: exact, but memory grows with traffic.

System design here, databases there. Topics never mix, but what you learn in one still counts in the others.

System designDatabasesKubernetes

Fair questions

Can I use it today?

Not yet. We're building it now, and the people on this list get in first.

Can't I just use ChatGPT or Claude?

They explain things very well. The difference is how you learn with it: a whiteboard that teaches you visually, side questions that don't derail your main lesson, and notes and memory that carry across every subject.

Who is it for?

Software engineers who want to really understand what they work with, whether that's for an interview, a new team or just because.

Ask every side question. Never lose the main lesson.

Join the waitlist