Learn a language faster with AI flashcards from your materials
The most effective vocabulary acquisition method — spaced repetition flashcards — has always had one obstacle: building the deck from your actual course materials takes hours. SKoolKool eliminates that step. Upload your language textbook chapter, grammar guide, or vocabulary list, and get a study-ready deck in seconds. Any language, any level.
Start learning — free
Vocabulary breadth: the most important variable in language acquisition
Decades of second language acquisition research converge on one finding: vocabulary breadth is the strongest single predictor of reading comprehension and communicative ability in a new language. The threshold commonly cited for comfortable native-text reading is around 8,000–10,000 word families — a number that requires deliberate, systematic vocabulary study to reach at any reasonable pace.
The most effective method for vocabulary acquisition is spaced repetition flashcard practice. It outperforms reading alone, wordlist review, and contextual guessing in controlled studies. Polyglots who have documented learning 5+ languages to high proficiency levels are nearly unanimous in crediting systematic spaced repetition as the primary driver of vocabulary retention — not more immersive methods that feel more natural but produce weaker memory encoding.
The barrier hasn't been the flashcard method itself — it's been the time required to build decks from your actual course material. SKoolKool removes that barrier.
Beyond Duolingo: studying from your actual course materials
Duolingo is effective for complete beginners because it handles curriculum sequencing and provides the motivation structure that most self-directed learners need in the early stages. Where Duolingo ends and SKoolKool begins: the moment you start using a structured textbook, taking a university course, or preparing for a proficiency exam.
If you're in a second-year university Spanish class using a specific textbook, Duolingo doesn't know Chapter 7's vocabulary list. If you're preparing for the JLPT N3, Duolingo doesn't cover the complete N3 vocabulary set systematically. If you're reading a graded Japanese reader and encountering specific vocabulary you don't know, Duolingo can't help you build a deck from that text.
Upload your Genki chapter, your JLPT N3 vocab list PDF, your French grammar guide, or your Spanish reading passage, and SKoolKool generates cards from exactly those materials. The deck you drill is the deck that covers your class or your exam — not a generic curriculum that may overlap only partially with what you need.
Grammar guides and authentic texts as flashcard sources
Vocabulary is only part of language learning. Grammar rules — Spanish subjunctive triggers, German case system endings, Japanese particle usage, French agreement rules — also benefit from systematic memorization before they become automatic. SKoolKool generates grammar rule cards from grammar guide PDFs alongside vocabulary cards.
A grammar card might test: "Which Japanese particle marks the direct object? → を (wo) — used after the noun receiving the action of the verb." Or: "When does German use the dative case? → As the indirect object of a sentence, and after specific prepositions: mit, nach, seit, von, zu, bei, aus, gegenüber, seit." These rule cards produce faster automaticity than encountering the rule through reading alone.
For advanced learners, authentic texts — news articles, short stories, graded readers — generate vocabulary cards with example sentences in natural context. A card generated from a news article includes the word in the sentence where you first encountered it, which provides a memory anchor that isolated word-meaning pairs lack. Compare this approach to Anki's approach, where you would need to type each card yourself.
Spaced repetition for language: the science of not forgetting
SKoolKool's spaced repetition system schedules each vocabulary card to appear at the interval just before you would naturally forget it. Words you reviewed yesterday with difficulty reappear today. Words you know confidently might not appear for another two weeks. Over a sustained study period, this means every review session is maximally efficient — you're spending time on exactly the words that need reinforcement.
This is fundamentally different from reviewing a vocabulary list in order. Sequential list review spends as much time on words you already know as on words you don't. Spaced repetition targets the gaps. For a language learner building toward a proficiency exam, this difference in efficiency can translate to weeks of shorter study time for the same breadth of vocabulary coverage.
Exam prep: JLPT, DELE, DELF, HSK, and other proficiency tests
Standardized language proficiency exams have defined vocabulary lists and grammar requirements at each level. JLPT N5 through N1 have official word lists. HSK 1–6 have defined vocabulary sets. DELE and DELF have competency frameworks with associated vocabulary ranges. These official resources exist in PDF format and are the ideal input for SKoolKool.
Upload the official JLPT N3 vocabulary list PDF and get a complete deck covering all 650+ word families at that level. Upload an HSK 4 prep guide and generate vocabulary cards organized by topic category (travel, work, education). Upload a DELF B2 reading comprehension practice set and use the quiz generator to create comprehension questions from the same passages. This exam-specific approach ensures your study time maps directly to the exam's tested content rather than general conversational fluency.
Works for any language, any level
Any language
Spanish, French, Japanese, Chinese, German, Arabic, Korean, Portuguese — if your PDF is in it, we can generate cards from it.
Any material
Textbook chapters, grammar guides, vocabulary lists, reading passages, exam prep PDFs, authentic texts.
Instant deck creation
Upload a Genki chapter and get vocabulary, grammar rules, and example sentence cards in under a minute.
Spaced repetition
Science-backed scheduling reviews each word at the interval that maximizes long-term retention.
Grammar Q&A
Ask 'when do I use subjunctive here?' and get an answer grounded in your grammar guide's explanation, not a generic internet reply.
Exam prep
Upload official JLPT, HSK, DELE, or DELF vocabulary and grammar PDFs for targeted proficiency-level drilling.
Frequently asked questions
What languages does SKoolKool support for flashcard generation?
SKoolKool processes any language that appears in the PDF. Spanish, French, Japanese, Mandarin Chinese, German, Arabic, Korean, Portuguese, Italian, Russian, and others all work. The AI extracts vocabulary, grammar rules, and example sentences regardless of the target language. The interface is in English, but the generated cards can contain content in the target language alongside English translations.
Can SKoolKool create vocabulary flashcards from a textbook chapter?
Yes. Upload a chapter from Genki (Japanese), Alter Ego (French), Panorama (Spanish), Komm Mit (German), or similar structured language textbooks and the AI generates vocabulary cards for new words, grammar rule cards for constructions introduced in the chapter, and example sentence cards. This gives you a ready-to-study deck specifically from the chapter you're studying, not a generic word list.
Is spaced repetition good for language learning?
It's one of the most research-supported vocabulary acquisition techniques available. Studies on second language acquisition consistently show that spaced retrieval practice — reviewing words at increasing intervals just before you're about to forget them — produces retention that passive reading cannot match. Polyglots who have learned 5+ languages almost universally credit systematic spaced repetition as the most important part of their vocabulary methodology.
How does SKoolKool compare to Duolingo for vocabulary building?
Duolingo is great for complete beginners learning from its curated curriculum — gamification keeps motivation high, and the progression is well-designed for the early stages. SKoolKool is complementary, not competing: it processes your actual course materials. If you're studying French at a university using a specific textbook, Duolingo doesn't know your textbook's vocabulary list. SKoolKool generates directly from the textbook chapter you're studying, so your deck matches your class.
Can SKoolKool help with grammar, not just vocabulary?
Yes. Grammar guides and chapters that include rule explanations and example sentences generate grammar rule cards alongside vocabulary cards. A card might have 'When do you use the subjunctive vs. indicative in French?' on the front, with the rule and an example sentence on the back. This works well for German case system rules, Japanese particle usage, Spanish verb conjugation patterns, and similar grammar-heavy material.
Can I use SKoolKool for JLPT, DELE, DELF, or HSK exam prep?
Yes. Upload official JLPT N3/N2/N1 vocabulary lists, DELE exam preparation guides, DELF comprehension material, or HSK word lists in PDF format and generate targeted decks for each exam level. The quiz generator also produces multiple-choice vocabulary and grammar questions from the same material, which is useful for exam simulation. This approach gives you a systematic way to cover official exam vocabulary lists rather than just studying conversational material.
Can I use SKoolKool to study from authentic texts like articles or books?
Yes. Upload a short story, news article collection, or chapter from a graded reader and the AI extracts unfamiliar vocabulary and key grammatical constructions as flashcards. This is useful at intermediate and advanced levels when you want to learn vocabulary in context — the cards generated from authentic texts include example sentences from the actual passage, which provides natural usage context that word-list flashcards lack.
Your language. Your materials. Your pace.
Upload your course materials and start building fluency from your own textbook, not a generic app curriculum.