Show HN：AI家教，助您學習與練習STEM書籍

AI Tutor for Lifelong Learners

Built by self-learners, for self-learners. Study Junkie lets you transform any textbook into an interactive course with discussions, practice exercises, and audio narration. It's like having the author as your personal tutor.

How We Think About Learning

Study Junkie is built around three fundamental steps that, in our experience, lead to real understanding.

Consume the Material

Read or listen to the source — each chapter can be narrated by AI. At your own pace and whenever it is convenient for you. This is Courses in Study Junkie.

Discuss It

Talk about what you've read with someone knowledgeable. Ask questions, get clarifications,
explore edge cases. The AI in Study Junkie serves this role, grounded in your source material. This is the Chat in Study Junkie.

Practice Until Fluent

Apply what you've learned. Answer questions. Work through exercises. Practice until the concepts become second nature.
This is the Assignments in Study Junkie.

Why We Built Study Junkie

We're lifelong learners ourselves. We built Study Junkie because we wanted a better way to engage with the books
sitting on our shelves — not to cram for tests, but to actually understand and remember
what we read. To make sure the AI is grounded in real knowledge, everything you study here is based on the source materials you provide.

Whether it's a philosophy classic you've been meaning to dive into, a history book that sparked your curiosity,
a business book recommended by a friend, or a quantum electrodynamics paper you want to understand —
Study Junkie is for people who learn because they want to.

From Book to Understanding

Four steps to start studying any material.

Upload Your Material

Drop any book, PDF, or text document into Study Junkie. The AI processes your content
and creates a structured course based on what you uploaded.

Study the Chapters

Study Junkie organizes your material into chapters. Read through them or listen to
AI-generated audio narration with adjustable playback speed. Study at your own pace
and revisit any section whenever you need.

Chat with AI Tutor

Have questions? Need clarification? Want to dive deeper into a concept? Chat with
the AI tutor grounded in your source material. Ask for explanations, request expanded
coverage of topics, or explore related concepts. AI intelligently chooses between answering in the chat or adding text into the lecture.

Practice with Assignments

Each chapter comes with exercises generated from your material—questions,
application tasks, or reflection prompts. Submit your answers and get
feedback from the AI to deepen your understanding.

Ready to turn your reading list into practical skills?

Upload it to Study Junkie and start learning.

Choose Your Payment Mode

Study Junkie offers flexible payment options to suit your needs.
Whether you prefer full control or hassle-free convenience, we've got you covered.

Self-Service Mode

Use your own API key.
Most of the LLM providers support free-tier usage, which makes StudyJunkie completely free to use.

Prepaid Tokens

Top up your account and let Study Junkie handle everything.
No API keys needed.

Both modes include: Unlimited courses, AI discussions, audio narration,
practice assignments, 8 languages, and all future features.

Common Questions

Study Junkie is built for self-learners, autodidacts, and lifelong learners — people who study
out of curiosity, not for exams or credentials. If you have a stack of books you want to truly understand,
topics you want to explore on weekends, or subjects you're passionate about diving deeper into, Study Junkie
helps you engage with that material more effectively. No deadlines, no grades—just learning for the joy of it.

Study Junkie aims to preserve all information from your source materials. The AI
generates discussions and assignments based on the complete content, helping you
understand the material in depth rather than just getting a summary.

Study Junkie accepts PDFs, DOCX, and text files. You can upload any book or document
you want to learn from—textbooks, non-fiction books, manuals, guides, articles,
or any other text-based material.

Study Junkie supports English, Russian, Spanish, French, German, Italian, Portuguese, and Polish.
You can upload source material in any language, and then choose which language you want the
lectures and assignments to be generated in. For example, you can upload a book in German
and study it in English, or vice versa.

The AI uses your uploaded document as its primary knowledge source when answering
questions and generating content. This means the discussions and assignments are
directly relevant to what you're studying, not generic information from the internet.

Yes! Every chapter can be narrated by AI, so you can listen to your lectures instead
of reading them. The audio player includes adjustable playback speed, making it perfect
for studying whenever reading isn't convenient.

Study Junkie generates exercises and questions based on your uploaded material. These can be
comprehension questions, application exercises, or analytical prompts depending on the content.
When you submit an answer, the AI provides feedback to help you learn.

Course generation typically takes a few minutes, depending on the length and complexity
of your source material. For a 500-page book, you can expect your course structure
to be ready within 2-3 minutes.

Study Junkie offers two payment modes: Self-Service Mode is free forever—you
just need to provide your own API key from your preferred LLM provider (like OpenAI, Anthropic, etc.).
Prepaid Tokens Mode lets you top up your account with a convenient amount, and Study Junkie
handles all the API management for you. Both modes include all features with no subscriptions or hidden fees.

Choose Self-Service Mode if you want full control over your AI costs and already
have (or don't mind setting up) an API key with a provider. Choose Prepaid Tokens
if you prefer a hassle-free experience without managing API keys—just top up and start learning.

Yes! Study Junkie is fully responsive and works great on mobile devices. The mobile
version is actively maintained, so you can study anywhere - on your commute, during
lunch breaks, or wherever you have a few minutes to learn.

Feed Your Curiosity

That book you've been meaning to really dig into? Upload it and start exploring.

StudyJunkie has a forever-free plan

For lifelong learners & curious minds

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