Quizlet, StudyFetch, Mindgrasp, NotebookLM, Anki and more — an honest side-by-side look at what each AI study companion app actually does, what it costs, and who it's really for.
Searching for a study companion app returns a wall of nearly identical marketing pages, and every tool claims to be the one that will fix your grades. The truth is more useful: each of these apps is built around one core strength, and the right choice depends on how you actually study — whether you drill flashcards, listen on a commute, chat with your notes, or need a whole textbook broken down.
We compared the seven most popular AI study companion apps on the things that matter: what they do with your course materials, what the free tier really includes, and what you'll actually pay. Pricing below was verified in July 2026.
Short on time? If you want flashcards from a giant shared library, get Quizlet. If you want your PDFs turned into study guides you can read, listen to, and quiz yourself on — without a subscription — try Study Companion. If you live inside Google's ecosystem, NotebookLM's free tier is hard to beat.
The label covers three different kinds of tools, and knowing which kind you need eliminates half the options immediately:
Built around spaced repetition and self-testing. AI features generate cards from your notes, but the core loop is drill and recall.
You upload lecture slides, PDFs, or textbook chapters, and the app converts them into something easier to learn from: summaries, study guides, audio, quizzes, or podcast-style recaps.
Chat-centric tools where you ask questions about your uploaded materials and get explanations, like office hours on demand.
Most students get the best results pairing one transformer app (to compress and re-format dense material) with one recall tool (to test themselves on it). For a deeper look at the category, see our guide to AI study companions.
| App | Core strength | Free tier | Paid pricing (verified Jul 2026) | Best for |
|---|---|---|---|---|
| Study Companion | PDFs/slides → study guides + concept map, per-chapter audio (3 styles), quizzes, free cited chat | 20 pages free at signup | Pay-per-page packs from $5.99 (50 pages); credits never expire, no subscription | Studying your own course materials end-to-end; avoiding subscriptions |
| Quizlet | Flashcards + huge shared set library | Yes, with daily caps on Learn/Test | Plus $35.99/yr; Plus Unlimited $44.99/yr | Pre-made flashcards for common courses |
| Anki | Gold-standard spaced repetition | Fully free (desktop + Android) | $24.99 one-time (iOS app) | Med students, language learners, long-term retention |
| Knowt | Free Quizlet-style flashcards + AI from lectures | Generous free tier | Ultra ~$10.99/mo or ~$120/yr | Students who left Quizlet over paywalls |
| StudyFetch | AI tutor (Spark.E) + live lecture transcription | Very limited (10 chats, 2 uploads) | Base from $4.99/mo (annual); Premium from $7.99/mo (annual, $99.99/yr) | Chat-style help across many material types |
| Mindgrasp | Notes/summaries/quizzes from documents & video | None (short card-required trial) | Basic–Premium $9.99–$14.99/mo (less on annual) | Summaries from mixed media incl. YouTube |
| NotebookLM | Source-grounded chat + two-host Audio Overviews | Yes — 3 Audio Overviews/day, 50 chats/day | Via Google AI plans from $7.99/mo | Research across many sources, free podcast summaries |
What it does: Upload a PDF, Word doc, PowerPoint, or even photos of printed pages, and Study Companion turns it into a complete study package: a structured chapter-by-chapter study guide, a knowledge graph that maps how the concepts connect (with citations back to the source), free "ask your book" chat that answers with cited passages, misconception-based chapter quizzes, and per-chapter audio in three styles — word-for-word read-along, a one-host podcast recap, or a two-host conversation. Scanned documents work too, thanks to built-in OCR. For big textbooks, you can select individual chapters and process only what you need.
What makes it different: Two things. First, everything is chapter-native — guides, audio, and quizzes are generated per chapter, so a 1,400-page textbook becomes a sequence of small, listenable, testable units instead of one giant blob. Second, the pricing model: there is no subscription and there are no daily caps. Processing costs 1 credit per page (packs start at $5.99 for 50 pages; every new account gets 20 pages free; credits never expire), a chapter's podcast recap adds 3 credits, a quiz adds 2, and chat is free. If you study hard during finals and barely at all in June, you don't pay for June.
Honest limitations: There's no spaced-repetition flashcard system (quizzes test you per chapter, but nothing schedules daily reviews), chat works per document rather than across your whole library, and there's no video/YouTube ingestion. For daily drill, it still pairs well with a free tool like Anki.
Pricing: 20 credits free at signup; packs of 50 ($5.99), 150 ($14.99), 500 ($39.99), or 1,500 credits ($89.99). 1 credit = 1 page processed; audio adds 3–5 credits per chapter, quizzes 2, chat is free. No recurring charges.
What it does: The biggest flashcard platform on the internet, with millions of user-created sets. If you're taking a standard course — intro biology, Spanish 2, the MCAT — someone has already made your deck. AI features can generate sets and practice tests from your notes.
Honest limitations: The free tier has tightened over the years: Learn and Test modes are capped, and features that used to be free now sit behind Quizlet Plus ($35.99/yr) or Plus Unlimited ($44.99/yr, which removes usage caps). Quality of shared decks varies wildly, and flashcards alone are a poor fit for dense conceptual material. If the paywall creep bothers you, see our full guide to Quizlet alternatives.
What it does: Anki is the spaced-repetition tool that medical students swear by. Its algorithm schedules each card at the exact interval where you're about to forget it, which is the most evidence-backed way to move facts into long-term memory.
Honest limitations: The learning curve is real — the interface feels like 2010, and making good cards takes effort (though shared decks like AnKing help). It's completely free on desktop and Android; the iOS app is a one-time $24.99 that funds development.
What it does: Knowt built its user base by importing Quizlet sets for free and keeping core study modes uncapped. It also generates flashcards and notes from lectures and videos with AI. The free tier remains one of the most generous in the category; Knowt Ultra (~$10.99/mo, or ~$120/yr) raises AI limits.
Honest limitations: AI-generated cards need review — expect to edit. The platform is younger and rougher around the edges than Quizlet's.
What it does: StudyFetch centers on Spark.E, an AI tutor that chats about your uploaded materials, plus a live lecture assistant that transcribes and takes notes in real time. It covers a lot of surface area: flashcards, quizzes, games, handwritten note support.
Honest limitations: The free tier (10 chats, 1 study set, 2 uploads) is only enough to peek at the product. Realistic use means Base at $4.99/mo (billed annually) or Premium at $7.99/mo annually / $99.99 per year. Jack-of-all-trades tools also tend to do each individual thing less deeply than specialists.
What it does: Mindgrasp generates notes, summaries, flashcards, and quizzes from almost anything — PDFs, lectures, YouTube links, audio files. Its summarization quality is frequently cited as a strength.
Honest limitations: There's no free tier at all — you enter a card for a short trial, and plans run $9.99–$14.99/mo (Basic to Premium, cheaper billed annually). For students who mostly need documents processed rather than videos, that subscription is hard to justify against pay-per-use or free options.
What it does: Google's NotebookLM lets you load up to 50 sources per notebook and chat with them, with answers grounded in citations to your documents. Its signature feature is Audio Overviews — two AI hosts discussing your material like a podcast. The free tier (3 Audio Overviews and 50 chats per day) is genuinely usable.
Honest limitations: The two-host format is entertaining but editorializes — it's a conversation about your document, not a faithful walkthrough of it, and you can't fully control what the hosts emphasize. Daily caps sting during exam weeks, and higher limits require Google AI subscriptions (from $7.99/mo). Study Companion generates both single-narrator recaps and two-host episodes on demand with no daily cap — our PDF to podcast guide covers which format fits which kind of studying.
Is it that you don't have time to read everything (→ transformer app), that you forget what you read (→ spaced repetition), or that you don't understand it (→ AI tutor)?
Subscriptions punish light and seasonal studiers. If your workload spikes around exams, pay-per-use (Study Companion) or free tools (Anki, NotebookLM) waste the least money.
If your only free hours are a commute, a gym session, or a shift where you can wear one earbud, prioritize apps with real audio output. If you study at a desk, text-first tools are fine.
Every tool demos well with a clean two-page PDF. Test with your actual worst material — the scanned 60-page reading, the 80-slide lecture deck — before committing.
There's no single winner — it depends on your study style. Study Companion is the strongest choice for working through your own course materials (study guides, per-chapter audio, quizzes, and free cited chat on a no-subscription model); Anki is best for long-term memorization; NotebookLM is the best free research tool; Quizlet still has the largest flashcard library.
Yes. Anki is fully free on desktop and Android, NotebookLM's free tier includes 3 Audio Overviews a day, Knowt has a generous free plan, and Study Companion gives every new account 20 pages of processing free with no card required (chat on processed documents is free, too).
They save time on the mechanical parts of studying — summarizing, reformatting, making cards — and make more of your day usable for review (e.g., listening during a commute). But research consistently shows the gains come from what you do with them: active recall and spaced review beat passive re-reading regardless of the tool. See our breakdown of whether listening to study material works.
That's usually the optimal setup: one app to transform dense materials into digestible formats, plus one free spaced-repetition tool to drill what you extracted. For example, Study Companion for summaries, commute audio, and chapter quizzes, with Anki for daily-drill facts you must not forget.
Upload any PDF, deck, or photo of your notes. Get a study guide, audio, quizzes, and free cited chat — 20 pages free, no subscription, no card required.