The Spaced Repetition Platform Built to Save You the Most Amount of Time
Nebulearn is an AI-native, gamified, and personalized study platform built to make serious spaced repetition simple. Generate flashcards from any content, study smarter with FSRS, and track every metric — all in one tab. Used by 1,000+ students at MIT, Stanford, Harvard, Johns Hopkins, Oxford, and more.
Get started free — no credit card required. Study within 2 minutes. View Premium plans for unlimited AI generation.
Built with One Goal: Save You as Much Time as Possible
Most study tools waste your time. Nebulearn was engineered from the ground up to eliminate every minute of unnecessary effort — from card creation to review scheduling.
2 Minutes to Your First Flashcard
Simple onboarding, no plugins, no imports. Sign up, paste your notes or upload a PDF, and generate a complete flashcard set in seconds. No configuration, no Anki add-ons, no learning curve. Open Nebulearn and you are already studying.
4 Seconds to Create a Card with the Chrome Extension
The Nebulearn Chrome Extension lets you highlight any text on any webpage and instantly create a flashcard. Anki takes over 2 minutes per card. Nebulearn takes 4 seconds. Rated 5.0 stars on the Chrome Web Store.
FSRS Spaced Repetition: Study Less, Remember More
FSRS (Free Spaced Repetition Scheduler) only shows you a card right before you would forget it. You never waste time reviewing what you already know. Students retain 83% of material after 2 months with FSRS compared to just 16% with unscheduled review. Tune the algorithm to your preference, or choose SM-2 or Leitner.
Everything in One Tab
AI generation, spaced repetition, sharing, gamification, and analytics — all in one platform. No app-switching between Anki for review, ChatGPT for generation, and a spreadsheet for tracking. Nebulearn does everything, and it syncs across all devices.
Why Nebulearn Beats Anki, Quizlet & the Rest
Advanced spaced repetition, complete control over AI generation, transparent learning analytics, and features that actually enhance memorization. Over 20 smart features used by 2,500+ early users with a 98% satisfaction rate.
Fully Controllable AI Flashcard Generation
Tell AI exactly what you want with custom generation prompts. Specify difficulty level (Comet, Meteor, Asteroid, and more), number of questions (up to 75 on Platinum), question type (multiple choice, fill-in-the-blank, cloze deletions, flashcards), and write custom instructions in plain English. You have full creative control — not a black box.
Any Content → Flashcards
Upload PDF lecture slides, PNG or JPG images, code files, CSV data, or paste plain text. Record live audio from lectures and have it transcribed and converted to flashcards instantly. Supports PNG, JPG, PDF, and TXT — all processed by AI to generate targeted study questions from your actual material, not generic internet content.
Three Spaced Repetition Algorithms
FSRS — the most advanced open-source spaced repetition algorithm, adapts to your personal memory curve using machine-learning-inspired scheduling. SM-2 — the proven classic SuperMemo 2 algorithm trusted by millions. Leitner — simple box-based system ideal for beginners. All three work across every question type, including multiple choice.
Gamified Learning: ELO, Streaks & Achievements
Stay motivated with a competitive ELO rating that rises as you master topics, daily study streaks, and milestone achievements. Your ELO is calculated per question set so you can see exactly how your mastery compares over time.
Unrivaled Per-Card Statistics
Track mastery level, consistency percentage, learning pace multiplier, ELO gained, and total sessions — per individual card. Nebulearn shows you the analytics that Anki and Quizlet simply do not have. Understand precisely what to focus on next.
Efficient Manual Creation with AI Autofill
Write flashcards manually with AI autofill for explanations. Full LaTeX math rendering for STEM subjects, rich text formatting, and image attachments. Import from JSON or build your question bank card by card with complete control.
Export Everywhere
Download your flashcards as PDF, DOCX, or CSV. Export directly to Anki, Quizlet, or Google Forms with one click. Your study data belongs to you and is always portable.
Share & Collaborate
Share any folder publicly with a shareable link, or make it discoverable in the Nebulearn library. Classmates can clone your question sets and study on their own independent spaced repetition schedule.
Cross-Device Sync
Your entire library, FSRS schedule, and stats are synced across all devices. Start a study session on your laptop and continue on your phone — your queue is always current.
Nebulearn vs Anki vs Quizlet
Anki requires manual card creation, has a steep learning curve, needs add-ons for AI generation, and the mobile sync requires AnkiWeb setup. Average time to create one card: 2+ minutes.
Quizlet has basic flashcard support but limited spaced repetition, no FSRS, no custom AI prompts, and paywalls many core features.
Nebulearn combines FSRS spaced repetition, AI generation, the Chrome Extension, gamified ELO tracking, and rich analytics in one platform. No plugins, no setup. Free forever. You are studying within 2 minutes of signing up.
Trusted by Students at Top Universities
1,000+ students · 10+ universities · 100,000+ questions created
Used at MIT, Stanford, Harvard, Johns Hopkins, UC Berkeley, Oxford University, University of Waterloo, McGill University, UC San Diego, University of Toronto, and Yale University. Students use Nebulearn for computer science interview prep, medical school anatomy, bioengineering coursework, mathematics proofs, and more.
Frequently Asked Questions
Is Nebulearn free?
Yes — free forever. The free plan includes 300 saved questions, 20 weekly AI generations, full Chrome Extension access, and all three spaced repetition algorithms. Premium and Platinum plans unlock higher limits and stronger AI models for students with heavier course loads.
How does Nebulearn spaced repetition work?
Nebulearn offers FSRS (recommended), SM-2, and Leitner. FSRS models your personal memory decay curve and schedules each card at the optimal review interval — right before you forget it. This reduces total study time while maximising retention. Students retain 83% after 2 months vs 16% without spaced review.
Do multiple-choice questions have spaced repetition?
Yes. All question types — multiple choice, flashcards, fill-in-the-blank, cloze deletions — are fully integrated with spaced repetition scheduling.
What file types can I upload?
PNG, JPG, PDF, and TXT. Upload lecture slides, textbook pages, or any study material. You can also record live audio or use the Chrome Extension to highlight text on any webpage.
Can I share study sets with other students?
Yes. Share folders publicly with a link or make them discoverable in the Nebulearn library. Each student clones and studies on their own independent schedule.
Is Nebulearn better than Anki?
Nebulearn includes FSRS (the same modern algorithm in Anki) plus AI generation, a 4-second Chrome Extension, ELO gamification, collaborative sharing, and analytics — all with no plugin setup. You are studying within 2 minutes of signing up.