Spaced repetition is one of the most effective learning techniques we know of, yet most tools for it live in their own silo. You make cards in Anki, review them in Anki, and the LLM you're learning with has no idea what you've retained or forgotten. The feedback loop between "understanding" and "memorization" stays broken.
I wanted a flashcard system that lives where I already learn—inside Claude. When I'm studying a topic with the model, it should be able to create cards on the fly, quiz me at the right intervals, and adapt based on how I perform. No context switching, no manual card creation, no separate app to remember to open.
The deeper motivation was testing whether MCP servers could deliver genuinely interactive experiences. Flashcards aren't just a data problem—they need a visual UI with flip animations, keyboard shortcuts, and real-time feedback. Building this as an MCP App pushed the boundaries of what's possible inside a chat interface.