The Leitner system is a widely used method of efficiently using flashcards that was proposed by the German science journalist Sebastian Leitner in 1972. It is a simple implementation of the principle of spaced repetition, where cards are reviewed at increasing intervals.
A Love Letter to Flashcards | Lesley Lai
A personal reflection on how spaced repetition and hand crafted flashcards helps me to keep understanding alive
Spaced repetition
Spaced repetition is an evidence-based learning technique that is usually performed with flashcards. Newly introduced and more difficult flashcards are shown more frequently, while older and less difficult flashcards are shown less frequently in order to exploit the psychological spacing effect. The use of spaced repetition has been proven to increase the rate of learning.
OpenDeck · Learn languages you own
Learn languages with spaced-repetition flashcards you own.
Mochi - Spaced repetition flashcards
Take notes and make flashcards using markdown, then study them using spaced repetition.
The Interface of Kai Krause's Software @mprove
Matthias Müller-Prove, Innovative Benutzungsschnittstellen, 1998/99, University of Hamburg
Leibniz book
If you are reading this on the Web (at https://leibniz.khinsen.net/), you are missing out on the dynamic and interactive features of this book. Get the full version by installing Leibniz on your computer.
dhkim0124/anki-mcp-server
A Model Context Protocol (MCP) server that connects Claude to Anki. This integration allows you to create and manage flashcards in Anki using natural language commands with Claude. Simply ask Claude to create flashcards, and they will be automatically added to your Anki decks.
Using spaced repetition systems to see through a piece of mathematics
By Michael Nielsen, January 2019
Andy Matuschak on Twitter / X
Made a Printer Friend which quickly transcribes speech onto little slips of paper. Nice for card sorts, quickly capturing open loops, discursive notes in books, etc.The speed of thermal printers and their auto-cutters is so satisfying! And dedicated mechanical key! Mm! pic.twitter.com/LDAXaD64go— Andy Matuschak (@andy_matuschak) September 25, 2026
Issue Cards | Service Design Tools
Support the conversation around complex matters by breaking down the subject into physical cards.
The Flix Programming Language
Flix is a principled effect-oriented functional, imperative, and logic programming language developed at Aarhus University and by a community of open source contributors.
Anki MCP - Connect Claude & ChatGPT to Your Anki Flashcards
Transform Anki into an AI-powered study system. Create flashcards instantly, review with natural language, and generate audio cards with Claude, ChatGPT, and other AI assistants.
Stuart K. Card and Thomas P. Moran, "User Technology—From Pointing to Pondering"
Tandem · A dance card for your calendar
A dance card for your calendar — share a link, let anyone book a line on it. On-protocol scheduling built on atproto.
coralscript
A writing system based on a hexagonal grid, where each letter is a tile filing the space.