Plain-text flashcard system using FSRS spaced repetition. Use when 'hashcards' is explicitly mentioned — for creating cards, managing decks, running reviews, or scripting card generation.
Hashcards is a plain-text, Rust-based flashcard system using the FSRS algorithm. Cards are Markdown files identified by content hash — editing a card resets its review progress.
Q: What is the capital of France?
A: Paris
C: The capital of France is [Paris].
Multiple deletions in one card generate multiple review items:
C: [Paris] is the capital of [France].
Escape literal brackets with backslash: \[not a deletion\].
Use --- between cards for visual organization (optional, ignored by parser).
$E = mc^2$, display $$\int_0^1 x\,dx$$ (relative paths)+++
deck = "physics"
+++
Q: What is Newton's second law?
A: F = ma
hashcards drill [DIRECTORY] # Start review session (web UI on localhost:8000)
hashcards drill --host 0.0.0.0 # Bind to all interfaces
hashcards stats # Collection statistics as JSON
hashcards check # Verify collection integrity
hashcards orphans # Manage deleted cards still in database
hashcards export # Export collections as JSON
--host <addr> — Bind address (default: 127.0.0.1)Four levels: Forgot / Hard / Good / Easy (keyboard shortcuts available in web UI).
Sibling burial: when a cloze card generates multiple items, reviewing one buries the others to prevent spoilers.
.md filesdeck field to group cards by topichashcards check periodically to catch corrupt or malformed cardshashcards stats to track review load and identify struggling decks