spaced-repetition
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Martin Schneider
Martin Schneider is the co-founder and CEO of RemNote, the all-in-one note-taking and spaced-repetition app he started coding as an MIT computer science student in 2017 to fix his own habit of forgetting everything he learned a semester later. What began as a private side project he used alone for three years grew into a learning platform with over a million users, backed by a $2.8M seed round from General Catalyst, 468 Capital, Soma Capital and Dorm Room Fund. He blends learning science, neuroscience and software to chase a single idea: that you should be able to learn something once and remember it forever.
Parrot
Parrot is a San Francisco-based, Y Combinator (Fall 2025) language-learning app that works like TikTok for Spanish. Learners swipe through short, native-speaker videos with tappable subtitles and an AI tutor, absorbing the language through comprehensible input rather than flashcard drills. The company positions itself as the app that actually produces speakers, aiming to turn idle scrolling into real conversational fluency.
RemNote
RemNote is an all-in-one learning platform that fuses note-taking, PDF annotation, and spaced-repetition flashcards into a single app, so students never have to bounce between Notion, Anki, and Quizlet. Born at MIT in 2020, it lets learners write notes and turn them into flashcards instantly - or let its AI generate cards, quizzes, and summaries from PDFs, lectures, and videos. Backed by a $2.8M seed round and used by hundreds of thousands of learners (especially medical and pre-med students), RemNote aims to reinvent how people learn, think, and remember.
Tim Novikoff
Tim Novikoff is the founder and CEO of Super Teacher, an AI tutoring app for elementary students that has reached roughly 20,000 families and public schools in New York, New Jersey, and Hawaii. A former NYC math teacher with a PhD in applied mathematics from Cornell, he co-authored a PNAS paper on the math of spaced repetition, built and sold the video-editing startup Fly Labs to Google in 2015, then worked on Google Photos and ran Google Colab before returning to education. As a kid he voiced Jeffy on MTV's animated series Daria.
Yermie Cohen
Yermie Cohen is the founder and CEO of Memorang, an AI stack for education that lets organizations build, launch, and scale custom learning and assessment content. A med student who arrived at UCLA from MIT with biology and mechanical-engineering degrees, he was buried in flashcards and frustrated by tools that were either too simple or too expensive, so he built his own. Memorang began as a free spaced-repetition study app in 2013 and has since become a platform pitched at publishers, institutions, and professional organizations who want to turn expertise into AI-driven courses, quizzes, and exams with humans kept in the loop.
Babbel
Babbel is a Berlin-based language learning company that teaches 14 languages through short, expert-designed lessons built for real-life conversation. Founded in 2007 and operated under the legal name Lesson Nine GmbH, it pioneered the paid subscription model for language apps and has sold tens of millions of subscriptions worldwide. Its lessons - typically 10 to 15 minutes - are written by linguists rather than crowdsourced or generated, and the company has layered in speech recognition and AI speaking practice while keeping human-designed pedagogy at the center.