SecondBrain is not another AI tutor. It's a lifelong cognitive companion that builds a living model of your mind — predicting what you'll forget, guiding how you'll learn, and evolving with you for years.
A living twin of your mind. Learning speed, memory strength, curiosity, attention span — all measured, all evolving.
Every concept you touch becomes a node. See the shape of your understanding, and where the gaps are.
We never give you the answer. We ask you the right questions, and reveal understanding when you're ready.
We know what you'll forget tomorrow. Revision is scheduled before the forgetting, not after.
You teach the AI. It evaluates your clarity, accuracy, and where you're missing ideas.
Surprising connections. Topics you didn't know you'd love, surfaced from the edges of your graph.
Paste a PDF, YouTube URL, or article. We extract, summarize, and turn it into a lesson.
Generated automatically. Reviewed at the exact moment you're about to forget.
Visual learner? Reader? Listener? Hands-on? We detect your style, and teach accordingly.
Traditional AI tutors answer. SecondBrain observes, predicts, challenges, and evolves.
Every interaction updates your cognitive profile. Not to grade you — to understand you.
We know what you'll forget before you forget it. Revision is scheduled proactively.
We never reveal the answer. We ask the question that unlocks the next insight.
Your SecondBrain grows with you. What it knows of you today is the foundation for tomorrow.
SecondBrain implements the Ebbinghaus forgetting curve at the level of individual concepts. Every fact you learn has a stability score — a number predicting when you'll forget it. Revision happens exactly when it's needed, not a moment before.
For the first time, I feel like someone is actually tracking how I learn — not just what I complete.
I used to re-watch the same lecture 4 times. Now SecondBrain schedules my revision before I even feel fuzzy.
The Socratic mode broke my dependency on answers. I actually think now. It's uncomfortable and wonderful.
Start with one topic. In 90 days, you'll have a cognitive twin that knows how you think, what you forget, and what you'll learn next.
Begin your SecondBrain