AI flashcard generator
with spaced repetition.

StudySensei is an AI-powered study companion that helps you learn faster and retain knowledge longer. It transforms your notes and documents into smart flashcards, uses spaced repetition (SM-2 algorithm) to schedule reviews at optimal intervals, provides an AI language tutor called Sage for conversational practice in 13 languages, and generates quizzes from your study material. Built for students, language learners, and professionals who want an efficient, science-backed approach to learning.

Upload any document (PDF, DOCX, or plain text) and StudySensei uses AI to extract key concepts and create question-answer flashcard pairs automatically. The AI identifies important terms, definitions, and relationships in your content, then generates cards organized by topic. You can review, edit, or regenerate any card before saving. Cards are automatically categorized by document headings so you can study specific sections.

Spaced repetition is a scientifically proven learning technique that schedules reviews at increasing intervals based on how well you know each card. StudySensei uses the SM-2 algorithm to calculate optimal review timing. Cards you find difficult appear more frequently, while cards you know well are shown less often. This targets the forgetting curve directly, helping you retain information in long-term memory with minimal study time.

Sage, the AI language tutor, supports 13 languages: English, Spanish, French, German, Italian, Portuguese, Japanese, Korean, Chinese (Mandarin), Arabic, Russian, Turkish, and Hindi. You can practice conversational scenarios like ordering at a cafe, job interviews, airport navigation, travel situations, and business meetings. Sage provides real-time corrections, vocabulary suggestions, and a rephrase feature to help you express ideas more naturally.

Yes, StudySensei offers a generous free plan that includes 5 flashcard decks, 5 AI generations per month, 3 language tutor sessions per month (15 minutes each), 10 document chat questions per month, multiple-choice and true/false quizzes, streak and XP tracking, and access to all 13 supported languages. Paid plans (Pro at $6.99/month, Sensei at $9.99/month) unlock more decks, AI generations, tutor sessions, advanced quiz modes, and full study analytics. All paid plans include a 3-day free trial and can be cancelled anytime.

Sage is an AI-powered conversational tutor that simulates real-world scenarios in your target language. Choose a scenario (cafe, job interview, airport, travel, business, or free conversation), select your proficiency level, and start chatting. Sage responds naturally in your target language, corrects grammar mistakes in real-time, highlights vocabulary words, and offers a rephrase button that suggests more natural ways to express your message. At the end of each session, you can save vocabulary words as flashcards.

StudySensei uses a persistent local cache powered by Firebase, so your flashcard decks, cards, and study data are available on your device even without an internet connection. You can review existing flashcards and continue study sessions offline. AI-powered features (card generation, language tutor, document chat) require an internet connection since they communicate with our cloud-based AI service.

All data is stored in Google Cloud Firestore with authentication-scoped access controls, meaning no one else can read or modify your data. Data is encrypted in transit with TLS and at rest by Google Cloud. AI requests are processed through our secure server-side proxy and never sent directly from your browser to third-party APIs. You can export or permanently delete all your data at any time from the Settings page.

AI-generated courses turn any flashcard deck into a structured multi-lesson curriculum. The AI creates an outline with pedagogical ordering, then generates lesson content with exposition, worked examples, comprehension checks, and skill assessments. You earn Bronze, Silver, or Gold skill badges based on your comprehension score. Courses are available on Pro and Sensei plans, with the free tier including 1 course per month.