Anki is an open-source spaced-repetition flashcard application for Mac that schedules every card review at the exact moment your recall of it is most likely to be slipping. If you have ever memorised something only to discover it completely gone three weeks later, this is the software that closes that gap.
What is Anki?
Anki is a free, open-source study tool built around the science of spaced repetition — an algorithm-driven scheduling method that surfaces material just before your brain forgets it. Unlike traditional flashcard apps that drill cards in fixed loops, Anki tracks your confidence rating on each review (a four-point scale from Again to Easy) and uses that signal to recalculate the ideal next review date for every card individually. The deck learns your personal forgetting curve, not some population average. Over months of daily use, a well-built Anki deck becomes a near-perfect retention machine.
What does Anki do best?
Scheduling is the obvious answer, but Anki's deeper strength is flexibility. A card can hold plain text, HTML, images, audio files, or LaTeX-rendered equations — making it equally at home whether you are drilling hiragana, cardiac drug classes, or Supreme Court holdings. The add-on ecosystem (written in Python and maintained by a devoted community) extends the app into territory a typical notes tool cannot touch: automatic furigana generation for Japanese decks, image occlusion for anatomy diagrams, sentence mining from subtitle files, and keyboard-driven review interfaces that keep your hands off the mouse entirely.
The desktop client for macOS is native and runs well on both Apple Silicon and Intel Macs. Sync to AnkiWeb keeps your review queue consistent between the Mac app, AnkiDroid on Android, and — if you are willing to pay for it — AnkiMobile on iPhone. I have finished a review session on my phone during a commute and returned to the desktop to find the queue already cleared. That frictionless sync loop is, in practice, what makes a daily review habit sustainable.
Is Anki free?
The Mac desktop application is completely free and open-source under the AGPL-3 licence. AnkiWeb — Anki's cloud sync service and shared-deck library — is also free. The one paid component is AnkiMobile, the official iOS companion, which carries a notable one-time purchase price (it is, famously, one of the more expensive apps on the App Store). AnkiDroid for Android is free. If you study exclusively on a Mac, you will never pay a cent.
Who should use Anki?
Anyone with a large, structured body of facts to retain long-term. Medical students building pharmacology and anatomy decks are Anki's most visible power-users — the community maintains enormous shared decks specifically for USMLE Step 1 and 2, the MCAT, and equivalent board exams worldwide. Language learners, particularly those approaching a logographic or highly inflected language, are the second core audience. Law students, CPA candidates, and anyone whose work demands keeping thousands of regulatory or technical details on tap also find Anki indispensable.
If your goals are short-term — cramming for a one-off presentation, skimming a single chapter — Anki is overkill. The software rewards people who commit to a daily review habit measured in weeks and months, not an afternoon sprint.
What are the best Anki alternatives?
Quizlet is the obvious comparison: a polished interface, social features, and a near-zero barrier to entry. Its adaptive-learning layer is genuinely useful but nowhere close to Anki's algorithm depth — Quizlet optimises for engagement; Anki optimises for long-term recall. RemNote merges spaced repetition with networked note-taking, a compelling hybrid for researchers who want their notes and their flashcards in one place. Mochi is the most Mac-native of the alternatives: Markdown-first, cleaner aesthetics, and a design that feels at home on Sonoma — worth a serious look if Anki's utilitarian interface puts you off. SuperMemo, the original SRS application from which Anki's core algorithm is derived, remains Windows-only and is notoriously punishing to master. For casual learners, Quizlet or Mochi may be the better starting point; for anyone who needs the most efficient path to permanent retention, Anki remains the benchmark.
