Users can access Quizlet's foundational free tier indefinitely, meaning there is no strict time limit or expiration date on using the basic flashcard creation and standard review tools. However, while the account remains free forever, access to specific advanced study modes, interactive practice testing, and guided learning pathways is restricted unless a paid subscription is purchased. Casual learners and students can continue reviewing public decks and making simple study sets indefinitely without paying anything, as long as they are willing to navigate standard ads and feature limitations.