How we compared these apps
Five apps, four things that actually decide the choice: how you build cards, what algorithm schedules the reviews, what it costs, and how much configuration you tolerate before your first session. Spaced repetition itself is settled science: review material at widening intervals, right before you would forget it. The apps disagree about how to implement that scheduling, and the disagreement costs you either learning efficiency or hours of setup.
Anki, Quizlet, Flashcard Lab, Cram, and Brainscape each pick a different side of that trade. Power through configuration, speed through simplification, living inside a spreadsheet you already use, stripped-down study with no scheduling at all, and letting your own confidence rating drive the intervals.
Anki: most powerful, steepest learning curve
Anki is the most configurable spaced repetition app available, and it charges you in effort. Desktop is free; the iOS app is a one-time $24.99. There is no Android app, and syncing across devices needs a separate online account.
You build decks by hand or import them from text files. Cards move through three states: new, learning, and review. After each card you rate how well you remembered it, and those ratings feed the SuperMemo 2 algorithm, which decides when that specific card comes back. SM2 is the most customizable scheduler in this group, with dozens of parameters you can adjust: ease factor, interval multiplier, learning step counts, and more.
Complexity is the price. The interface is dense, the settings screens bury useful options, and the documentation assumes you already understand spaced repetition. Expect weeks of friction before any of it feels normal.
Push through and the payoff is real. You design card templates in HTML and CSS with images, audio, and video embedded. A large add-on community extends the rest: automatic deck organization, richer statistics, alternative scheduling algorithms. Interval spacing and ease progression bend to whatever your goals actually are.
Language learners and medical students keep choosing it for exactly that reason. Anki is also the de facto format in many knowledge communities, so shared decks tend to show up in Anki form first.
Quizlet: easiest for beginners
Quizlet puts speed of starting above everything else. The interface is responsive and obvious, and you can be studying within a minute. The free tier covers flashcards, matching, and written answer modes. Plus removes ads and adds unlimited custom formatting, images, and media for $3.74 per month billed annually, or $9.99 billed monthly.
There is no spaced repetition scheduling here. Study modes exist, but cards come up in the order you set or at random rather than on a schedule built around your forgetting curve. Quizlet is built for a study session the night before, not for retention six months out.
Where it wins is people. Millions of pre-built study sets sit in a public library, teachers assign sets to students, and study groups share decks. For test prep and classroom work it beats Anki on the two things that matter most there: starting fast and sharing easily.
Flashcard Lab: spreadsheet-native SRS
Flashcard Lab runs inside Google Sheets and stores your cards as spreadsheet rows. If your study notes, research outlines, and data already live in Sheets, your cards live there too, and the context-switching disappears.
Scheduling uses a modified Leitner system. Cards start at the shortest interval, usually one day, then graduate on each correct review: three days, one week, two weeks, a month, further out from there. Miss one and it drops back to the shortest interval. Simpler than SM2, and less flexible for it, since you cannot tune interval progression per card type.
Premium is a one-time $10.99, which unlocks unlimited spaced repetition reviews, ad-free mobile use, and reverse card review. Menus are clearer than Anki’s and there is far less to configure, so more of your time goes into reviewing.
It is the right pick if Sheets is already where you work and you want genuine spaced repetition without Anki’s setup tax.
Cram: no true SRS
Cram gives you a Quizlet-shaped experience: quick study sets, matching games, flashcard review. There is no spaced repetition underneath. Cards come up randomly each session or in your chosen order, never on a schedule tied to your forgetting curve.
The app is free with ads. Five dollars a month strips the ads and adds colored text, bulleted lists, and custom fonts. The layout resembles Quizlet’s but with smaller cards and more visual clutter, which makes longer sessions feel cramped.
Use it for capitals, vocabulary, and facts you need by Thursday. For retention that survives the month, it has nothing to offer.
Brainscape: confidence-based scheduling
Brainscape schedules on your own judgment. After each card you rate your confidence from one to five, and that number decides when the card returns: high confidence pushes it away, low confidence brings it back soon. You are tuning by felt difficulty rather than trusting an algorithm’s inference.
The free version studies fine until every tenth card, where a checkpoint pop-up asks whether you want to keep going. That interruption breaks the rhythm and only money removes it. Pro runs $7.99 per month billed annually or $19.99 billed monthly.
Friction shows up elsewhere too. Card editing works differently in the web app than on mobile, so the navigation you learned in one place does not transfer. Combined with the checkpoint pop-ups, the free tier reads as an artificial paywall more than a trial.
Why note-driven learners need a different approach
Every app above expects you to build cards by hand or import them. You type question-answer pairs, paste them from a spreadsheet, or pull a community deck. That workflow is fine if you enjoy card-building, or if you are drilling material someone else already packaged.
It stops being fine once you already take structured notes. You write the material to learn it, then write it again as cards, covering the same ground twice for no additional understanding.
Fluxo closes that gap. You write rich-text notes in spaces and topics, the same way you would in any note app, and the AI generates flashcards, quizzes, and summaries from what you wrote. Those cards go into spaced repetition scheduling, so the material comes back over time instead of sitting in a file you never reopen.
A companion mascot, review streaks, and gamified sessions keep the habit alive, and the AI suggests new topics when you are deciding what to study next. For anyone whose notes are already detailed, the card-building step simply stops existing, and review scheduling attaches to material you actually wrote.
Where Fluxo falls short
Fluxo will not import your existing decks or hand you pre-made course content. If you lean on community study sets, institutional materials, or a shared library like Quizlet’s millions of decks, you are starting from a blank page instead. Against Quizlet, where thousands of vetted sets are one search away, that is a real cost and worth weighing before you switch.
Output quality tracks note quality, too. Thin or disorganized notes produce thin, disorganized flashcards, because the AI can only reformulate what you already wrote down. Learners who skim, highlight, and move on will not get much back from it; learners who write things out during study will.
Which spaced repetition app is right for your learning goals?
Pick Anki if you want unlimited customization and can spend weeks getting comfortable. SM2 plus the add-on ecosystem repays that investment, provided you actually make it.
Pick Quizlet when starting fast, studying with other people, and pulling from a pre-built library matter more to you than retention science. It handles test prep and group study well without ever scheduling a single review.
Pick Flashcard Lab if Google Sheets is already your workspace and you want real spaced repetition without Anki’s configuration burden. Pick Cram if you need something free and are fine without scheduling at all. Pick Brainscape if rating your own confidence beats trusting an algorithm, and the free-tier interruptions either do not bother you or are worth paying to remove.
Stop writing the same material twice
Right now, finishing a study session means opening a second tool and retyping what you just learned into question-answer pairs. Forty cards is an hour you spend transcribing rather than learning, and the cards you skip building are the ones you quietly forget. Picture closing your notes and having the review queue already built from them, waiting for tomorrow.
That is what Fluxo does. Write rich-text notes in spaces and topics, and the AI turns your material into flashcards, quizzes, and summaries that feed a spaced repetition schedule, with streaks, a companion mascot, and topic suggestions to keep you moving. It will not write your notes for you and it has no shared deck library to browse, so if you want someone else’s cards, Anki or Quizlet serves you better.