AI second brain
Capture everything. Then ask your second brain anything.
Drop your notes, PDFs, and links into one workspace and let it remember for you. Ask a question in plain language and the AI answers grounded in your own captured material — with citations back to the exact source — while semantic search recalls the right idea even when you've forgotten the words. All in the workspace you write and publish from.
Capture now, find it forever
Drop in a note, a PDF, or a link the moment it crosses your mind. It all lands in one workspace your second brain can recall later — no folder you'll forget you made.
Ask your brain, don't dig through it
Pose a question in plain language and get an answer grounded in your own captured material — with citation chips back to the exact source — instead of scrolling years of notes.
Grounded in your memory, not the open web
Chat is scoped to the source set you select, so answers come from what you actually saved rather than a generic model inventing plausible-sounding facts.
Semantic recall that reads meaning
Vector search matches on meaning, so a half-remembered idea surfaces even when you describe it with completely different words than you wrote it down.
Organize into Spaces when you want to
Group sources into Spaces per project, topic, or area of your life, then scope chat and search to just that set so a question stays on-subject.
Turn private notes into public work
Your second brain lives in the same workspace you publish from, so a captured idea can become a public, SEO-ready page — or a gated, paid one — without copying it anywhere.
Frequently asked questions
What is an AI second brain?
A second brain is an external memory where you capture everything worth remembering — notes, PDFs, links — so you don't have to hold it all in your head. JustJot.ai makes it an AI second brain: instead of only storing what you capture, you can ask it questions and get answers grounded in your own material, with citations back to the source.
What can I capture into it?
Notes you write, PDFs you upload, and links you paste. Everything becomes a source you can chat with, search semantically, and cite — all held in the same workspace.
How does it keep answers accurate?
Chat is grounded in the source set you select and every answer carries citation chips back to the passage it came from, so you can open the source and verify any claim before you trust it.
How is this different from regular search?
Semantic search matches on meaning, not just exact words, so you find the right note even when you describe it differently than you wrote it. You can also just ask a question and get a synthesized, cited answer from across everything you've captured.
Is it free to start?
Yes — add a note or upload a PDF and start building your second brain without a credit card. Paid tiers exist for heavier use, but capturing and asking your own material works on the free tier.
Stop trying to remember. Start asking.
Free to start. Capture a note or a PDF, then ask it a question.
Get started free