Learn anything. Forget nothing.
Cortex turns your PDFs and notes into interactive lessons, quizzes, and deep research — five AI modes in one conversation, with a memory of you that compounds every time you study.
Free account · No credit card · English & 繁體中文
Most AI tools answer, then forget. Cortex is built on the opposite idea — learning compounds when every conversation, quiz, and note feeds one living memory of you.
Everything a tutor should be
Unified Chat Workspace
Five modes, one threadChat, Deep Solve, Quiz, Deep Research, and Math Animator share one context. Escalate from a quick question to multi-agent problem solving without losing a message.
Knowledge Hub
RAG-readyUpload PDFs, Markdown, and text to build knowledge bases. Color-coded notebooks organize insights that power every conversation.
Guided Learning
Structured journeysCortex designs multi-step learning plans from your materials and generates an interactive page for every knowledge point.
Personal TutorBots
Autonomous tutorsTutors with their own memory, personality, and skill set. They set reminders, learn new abilities, and evolve as you grow.
AI Co-Writer
Write togetherA Markdown editor where AI is a real collaborator — rewrite, expand, or summarize, drawing on your knowledge base and the web.
Persistent Memory
It compoundsA living profile of what you've studied, how you learn, and where you're heading — shared across every feature and TutorBot.
Your documents become your curriculum
Stop pasting fragments into a chatbot. Upload once, and every conversation draws on your actual course materials.
- PDF, Markdown, and text indexed into RAG-ready knowledge bases
- Color-coded notebooks organize insights across sessions
- Answers grounded in your materials, not generic web text
From a PDF to a learning journey
Cortex reads your materials and builds a structured, visual path through them — so you always know what to learn next.
- Multi-step study plans designed from your own documents
- An interactive page generated for every knowledge point
- Discuss and ask questions alongside every step
A tutor that grows with you
Each TutorBot lives in its own workspace with its own memory and personality — a study companion that remembers yesterday and plans tomorrow.
- Dedicated memory, personality, and skills per TutorBot
- Reminders and new abilities it learns over time
- Quizzes and progress tracking that adapt to your gaps
Up and running in minutes
Create your free account
Sign up in seconds and upload your first PDF, notes, or textbook chapter.
Learn in one thread
Chat, solve step by step, generate quizzes, and research deeply — without switching tools or losing context.
Let memory compound
Cortex remembers what you studied and how you learn, adapting every next session to you.
Frequently asked
What is Cortex?
Cortex is an agent-native AI tutoring platform. It combines chat, step-by-step problem solving, quiz generation, deep research, and math animation in a single conversation — grounded in the materials you upload and backed by a persistent memory of your learning.
What files can I upload?
PDF, Markdown, and plain-text files. Cortex indexes them into RAG-ready knowledge bases so every answer can draw on your own materials.
How is Cortex different from a general chatbot?
Three ways: answers are grounded in your own documents rather than generic web text; five specialized learning modes share one conversation so you never lose context; and a persistent memory tracks what you've studied, so tutoring adapts to you over time.
Does Cortex support Chinese?
Yes. The entire interface and tutoring experience are available in English and Traditional Chinese (繁體中文).
Do I need a credit card to start?
No. Creating an account is free — sign up with email, a magic link, or Google and start uploading materials right away.
What are TutorBots?
TutorBots are personal, autonomous AI tutors. Each one lives in its own workspace with its own memory, personality, and skill set — it can set reminders, learn new abilities, and evolve alongside your progress.