Digital vs. Paper Flashcards: What the 2025 Research Actually Says

Why This Debate Still Matters

Walk into any college library or coffee shop and you will see both stacks of index cards and glowing phone screens. The flashcard, in its physical or digital form, remains one of the most widely used study tools. But the question of which format actually produces better learning outcomes has persisted for years, largely because the evidence was anecdotal or based on small, uncontrolled experiments.

That is changing. A 2024 survey of UCLA students found that 77.8% of students now use digital flashcards, and among those who have also used physical cards, 60.1% prefer the digital format. The global flashcard app market is projected to grow from an estimated $0.93 billion in 2026 to $2.28 billion by 2035, reflecting a compound annual growth rate of 10.49%. These numbers tell us that students are voting with their downloads, but the underlying question remains: does the research support the shift?

This article examines the strongest available evidence — including a 2025 randomized controlled trial published in Cogent Education — to give students, educators, and self-directed learners a clear, data-driven answer. If you are specifically interested in English vocabulary learning, we have a separate focused treatment of that topic. Here, we keep the scope broad across all subjects.

What the 2025 Study Actually Tested

The most rigorous recent comparison of digital and paper flashcards comes from a 2025 study by Najafi Karimi and Kheradmandi Amiri, published in Cogent Education (Taylor & Francis). The study was a randomized controlled trial — the gold standard for causal evidence — designed to isolate the effect of the flashcard format on both immediate learning and long-term retention.