Harken
Harken uses spaced repetition, supports rich content types.
At a glance
Starts at
$9.99 per month
Includes unlimited flashcards and importing from Quizlet.
Free tier
No
Platforms
Web
Best for
Students, professionals, language learners.
3.8 out of 5
Scored by a Toolio reviewer after real useOur verdict
Optimized for long-term memory retention but not ideal for visual learners or those preferring traditional notes over flashcards.
✓What it does well
Spaced repetitionReview concepts at optimal intervals.
Rich content supportSupports images, code blocks, and more.
Web-based accessAccessible on any device via web app.
✕Where it falls short
Limited to digital contentDoesn't support analog or physical flashcards.
No offline modeRequires internet for studying and reviewing.
Cost of importing Anki decksCharges extra for Anki deck import service.
Key features
AI-generated questionsEasily creates flashcards from web articles.
Progress trackingVisualizes learning progress over time.
Cross-platform accessAccessible via responsive web app on any device.
web article questionsgenerates flashcards from web content