Best flashcard apps, compared

"Best flashcard app" depends entirely on which job you're hiring it for. A tool built to get you to open it every day (streaks, leagues) optimizes for something different than a tool built to schedule what you review. Here's the actual landscape, grouped by what each option is really trying to do, not by feature checklist.

Real spaced-repetition schedulers

These decide when you see a card again based on whether you got it right, not just whether you opened the app.

• Anki - the most configurable scheduler that exists, if you're willing to configure it. Desktop-first, huge add-on ecosystem, a real learning curve before it runs itself.
• SuperMemo - invented the algorithm most modern spaced repetition descends from, and still the most tunable version of it. The cost is the same as Anki's, doubled: more knobs, more setup.
• Encodr - the same fixed-interval-ladder idea as Anki and SuperMemo, with no settings screen and a phone-first scroll feed instead of a desktop session. What spaced repetition actually does covers the mechanism; the free MCAT deck is the fastest way to see it running on real content.

Simple online flashcard makers

Fast to start, thin once you're relying on them daily.

• Quizlet - zero setup and huge public-set coverage. The scheduling underneath is closer to flat review than real spaced repetition.
• StudyBlue and Cram-style makers - make a set, flip through it, maybe self-quiz. No scheduler deciding what's actually due.
• Brainscape - schedules by how confident you say you are about a card, which is a self-report, not a measurement of what you'll actually remember next week.

Gamified and habit-first apps

• Duolingo-style streaks and leagues - genuinely effective at getting you to open the app. Whether the review that follows is well-scheduled is a separate question the gamification layer doesn't answer.

AI flashcard generators

• ChatGPT/Quizlet-style AI generators - fast to produce a full deck from a prompt or PDF. Card quality is the actual risk: multi-fact cards, leaky answers, and confident wording on things the model got subtly wrong.

Note-based and DIY tools

Not built as flashcard apps, but people use them as one.

• RemNote - merges note-taking and spaced repetition in one editor. That's a real convenience if your notes and your review cards are the same thing; a real cost if they're not.
• Notion or a spreadsheet - a "show random row" view can technically function as flashcards. It doesn't know what you got wrong last time.
• A plain notes app - excellent for looking something up, not built for producing it from memory on demand.

Analog and no-app options

• Paper flashcards - get the actual mechanism right (you have to produce the answer). What they can't do is remember when to show you a card again - that's on you.
• The textbook itself - the accurate source, and a bad delivery mechanism for making facts stick, since reading is recognition, not retrieval.

The actual decision

If you already have a working Anki or SuperMemo habit, the scheduler isn't your problem and switching costs more than it buys. If you don't have a habit yet, the honest failure mode for most people isn't a bad algorithm - it's not opening the app - which is why where you study (a feed on your phone vs. a desktop session you have to sit down for) usually matters more than which scheduling formula is underneath it.