Lambdio
AI Tutor + Spaced Repetition
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Master university courses with an AI tutor and spaced repetition. 130+ courses across economics, physics, psychology, and more. Study smarter, remember longer.
Meet Lambdio - the AI study companion that helps university students actually remember what they learn.
Most study apps let you forget. Lambdio is built on two evidence-backed mechanisms: interactive AI tutoring that makes you actively recall and explain concepts, and a best-in-class spaced repetition engine (FSRS v5/v6) that schedules each chapter's reviews at the exact moment you're about to forget it. Study less, remember more, retain it for years.
130+ courses across 10 disciplines
Economics, Physics, Psychology, Statistics, Math, Computer Science, Data Science, History, Law, and Political Science - from introductory to doctoral level, organized into structured learning paths that mirror real university curricula.
Learn with an AI tutor that adapts to you
• Standard Mode - step-by-step interactive lessons with real-time feedback
• Socratic Mode - the AI guides you to discover answers yourself
Review and test modes
• Chat Review - retrieval practice that pinpoints your knowledge gaps
• Feynman Mode - explain concepts as if teaching a beginner, and the AI probes your weak spots
• Quiz Mode - rapid multiple-choice reviews of each chapter
• Mega Quiz - interleaved quizzes across 3 or 5 chapters to boost retention
• Chapter Quiz - a comprehensive ~50-question exam that earns you a certificate
Proven algorithm
Lambdio uses a custom version of FSRS, the state-of-the-art spaced repetition algorithm (published at ACM KDD 2022 and IEEE TKDE 2023) that outperforms classic SM-2 schedulers like Anki's. In a May 2026 pilot at Ostroh Academy, engaged students scored up to 14.6% higher on their final exams than the control group.
Stay motivated
50 levels, XP rewards, achievement badges, learning streaks, and a GitHub-style heatmap turn consistent review into a habit.
Verifiable certificates
Earn course and learning-path certificates with unique QR codes that anyone can verify at lambdio.com/certificate
Free to start. Upgrade to Premium for unlimited AI sessions, longer conversations, the full chapter-quiz exam, and certificate generation.
Download Lambdio - study smarter, remember longer.
Privacy Policy: lambdio.com/privacy-policy
Terms: lambdio.com/terms-of-service
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Roman Vasylyshyn, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Roman Vasylyshyn
- Size
- 28.3 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lambdio Premium Yearly $99.99
- Lambdio Premium Monthly $12.99
- Copyright
- © 2026 Roman Vasylyshyn. All rights reserved.