Anki is the gold standard of spaced repetition — battle-tested, free, endlessly customisable. StudyTab exists for everything around the cards: making them, grounding them in your sources, and seeing what they add up to. Same proven algorithms, far less manual labour.
Anki's desktop and Android apps are completely free. If budget is the constraint and you enjoy making cards by hand, Anki is unbeatable value.
Anki's add-on ecosystem is unmatched — custom schedulers, heatmaps, image occlusion variants. If your workflow depends on specific add-ons, stay where they live.
StudyTab is a web app (installable PWA with offline review for downloaded decks), but Anki's native desktop app remains the stronger fully-offline experience.
If that's not you — if cards take too long to make, your notes live in three other apps, and you want to see what you actually know — that's the gap StudyTab was built for.
One-click .apkg import, FSRS continues where you left off — and export back out anytime.