FSRS - Free Spaced Repetition Scheduler
MIT upstreamOpen Spaced Repetition community
Review scheduling algorithm used by EnStudy Hub.
https://github.com/open-spaced-repetition/fsrs4ankiBack to homeCredits and Attribution
Sources EnStudy Hub acknowledges.
This page is for attribution only. EnStudy Hub learning content, product design, and brand belong to 100B Studio and are not released under CC BY or MIT.
Copyright: Copyright 2026 100B Studio. All rights reserved. Third-party libraries keep their own upstream licenses.
Algorithms
SM-2 (SuperMemo 2)
Research/public referencePiotr Wozniak
Foundational spaced repetition reference.
https://supermemo.guru/wiki/SuperMemo_Algorithm:_SM-2Anki
AGPL-3.0 reference onlyDamien Elmes and community
UX reference for flashcards and review queues. No Anki source code is used.
https://apps.ankiweb.net/Reference word lists
Oxford 3000 word list
Public word list attributionOxford University Press
Reference word list only. EnStudy Hub does not copy Oxford definitions or examples.
https://www.oxfordlearnersdictionaries.com/wordlists/oxford3000-5000Learning content
Definitions, examples, mnemonics, and learning content
Copyright 2026 100B Studio. All rights reserved.100B Studio / EnStudy Hub
Learning content and brand belong to 100B Studio. This credits page is attribution only and does not license EnStudy Hub content as CC BY or MIT.
https://www.100b.studio/Libraries
Next.js
MITVercel
App Router and React Server Components.
https://nextjs.org/Supabase
Apache 2.0Supabase Inc.
Auth and PostgreSQL.
https://supabase.com/ts-fsrs
MITOpen Spaced Repetition
TypeScript FSRS implementation.
https://github.com/open-spaced-repetition/ts-fsrsTailwind CSS, shadcn/ui, Lucide, Framer Motion, Sonner
Upstream licensesOpen-source communities
UI system, components, icons, animation, and notifications.
https://tailwindcss.com/