There's no single winner — the right choice depends on your priorities. For pure AI generation speed and breadth (PDFs, YouTube, images, URLs), QuickCards leads in 2026. For the most mature SRS algorithm and offline reliability, Anki is still the gold standard for medical students who don't mind making their own cards.
For free use without ads or generation limits, Knowt is the most popular choice among AP students, though it lacks image occlusion and the SRS is basic.
For users who want notes and flashcards in one app, RemNote is uniquely positioned but has a steep learning curve.