Thea

Thea is an AI study app that turns your notes, PDFs, lecture videos, or a pasted YouTube link into flashcards, quizzes, study guides, and practice tests. It's currently free for students, with an optional paid subscription for extra access.

Best for: Free AI study sets while it lasts

What you get

• Free tier: create a free account and use it for free — the pricing page explicitly says "Students, it's FREE!" (some sources describe this as free during beta, so it could change)
• Paid option: the iOS "Early Access" in-app subscription is ~$10/mo or ~$40/yr; there is no published web pricing table, so check their site
• Turns your own uploads — handwritten notes, PDFs, lecture videos, or a pasted YouTube link — into flashcards, quizzes, summaries, and tests using active recall
• No time-limited free trial; the free tier is the free access. Educators/institutions need a custom quote (email info@thea.study)

How students use it

• Upload a PDF and get flashcards, a study guide, and practice questions in one shot
• Paste a YouTube lecture link and study from it like a document
• Run adaptive quizzes that focus on what you keep missing