Ask a medical student how they held tens of thousands of facts in their head through board exams, or a serious language learner how they carry thousands of words, and a lot of them will answer with a single word: Anki. It has earned that reputation over close to two decades. It is free on most platforms, open-source, endlessly configurable, and surrounded by an ecosystem of shared decks and add-ons that no other flashcard app comes close to matching.
So let us be clear from the start: this is not an article about why Anki is bad. Anki is one of the best pieces of learning software ever made. The honest question is not which app is better in the abstract — it is which one is right for you, given what you are trying to remember and how much friction you are willing to absorb to do it. For many people the answer is Anki. For many others it is something simpler. This is an attempt to help you work out which group you are in.
The part that is no longer different: the algorithm
A comparison like this used to spend most of its time on scheduling. It no longer needs to. Both Anki and NeuraKnow now run on FSRS — the Free Spaced Repetition Scheduler developed by Jarrett Ye and the Open Spaced Repetition project. Rather than the older fixed-multiplier approach, FSRS models each card's difficulty, stability, and retrievability, then predicts the day your recall will drop to a threshold you choose, usually around 90 percent. Anki adopted it in 2023 and now ships it as the default; NeuraKnow was built on it from the start.
In practice, that means the scheduling science underneath the two apps is essentially the same. Whichever you choose, the algorithm deciding when to show you a card is the same modern one, doing the same job: less review for the same retention. So the real decision is not about which app respects the science more. It is about everything wrapped around the algorithm — setup, interface, ecosystem, privacy, and philosophy. That is where Anki and NeuraKnow genuinely part ways.
What Anki does that almost nothing else can
Anki's power is not marketing; it is real, and it compounds the more you invest in it. A few of the things it does exceptionally well:
- Deep customization. Anki separates the content of a card (a note) from how it is shown (a card template). You can define your own note types with arbitrary fields, style cards with HTML and CSS, and generate several cards from a single note. If you can picture a card format, you can usually build it.
- Rich media and cloze deletion. Cards can carry images, audio, and video. Cloze deletion — hiding part of a sentence with syntax like
{{c1::...}}— turns a line of text into a fill-in-the-blank in seconds, which language learners and med students rely on constantly. - The shared-deck ecosystem. This is the real moat. Years of users have published decks for almost everything: the enormous AnKing deck for medical school, deep decks for Japanese, Spanish, anatomy, law. You can download tens of thousands of pre-made cards and start reviewing tonight.
- Add-ons and control. Hundreds of community add-ons extend the desktop app, and you can hand-tune nearly every scheduling parameter if you want to.
- Cross-platform, with free sync. Anki runs on Windows, Mac, Linux, and Android, and syncs across them at no cost through AnkiWeb, so your reviews follow you from laptop to phone.
That combination is why Anki is the right tool for serious, high-volume, long-horizon learning — a medical degree, a language to fluency, a professional certification — and for anyone who genuinely enjoys shaping their own setup. The cost of that power is a learning curve. Note types, deck options, sync accounts, add-ons, and scheduler settings all greet you early. And while Anki is free on desktop and Android, the official iPhone app, AnkiMobile, is a one-time purchase of around $25 — which, fairly, funds development of the entire project. None of this is a flaw. It is the price of a tool built to do everything.
What NeuraKnow is built for
NeuraKnow starts from a different question. Not "what is the most powerful flashcard system we can build?" but "what is the smallest possible gap between reading something worth keeping and having it scheduled for review?"
So it deliberately does less. There are no note types to pick, no deck options to configure, no sync account to create, no add-ons to browse. You open the app, type a question and an answer, and you are done — the FSRS defaults are already set sensibly, so the schedule simply works. Capturing a card takes seconds, and that matters more than it sounds. The habit that survives is the one you can do in the ten seconds after finishing a paragraph, not the one that waits for a free weekend to configure.
It is also private in a way that has become rare. NeuraKnow is fully on-device: no account, no cloud, no ads, no analytics, no tracking. Your cards live on your phone and nowhere else. There is nothing to log into and nothing being collected — a deliberate design choice, not a missing feature. And it is genuinely free on both iOS and Android, with no premium tier and no paywall, just an optional "buy me a coffee" if it earns one. NeuraKnow is the right tool if you bounced off Anki's complexity, or if you mostly want to remember the things you read rather than build and maintain a twenty-thousand-card deck.
The honest trade-offs
Simplicity has a cost too, and it would be dishonest to hide it. Because NeuraKnow is on-device by design, it does not sync across your devices — your cards stay on the phone where you made them. There is no desktop app. There is no shared-deck ecosystem, so you write your own cards instead of downloading someone else's. And it does not yet support images, audio, or cloze deletion; cards are text questions and answers.
For some people, one of those gaps is a deal-breaker, and that is genuinely fine — it means Anki is your app. A med student who needs the AnKing deck, a language learner who wants audio on every card, or anyone who studies mainly at a desktop should choose Anki without hesitation. NeuraKnow is not trying to replace that. It is trying to be the app for the much larger group of people who never got that far, because the setup tax stopped them first.
The two apps at a glance
None of these differences make one app correct and the other wrong. They sort the two tools toward different people. Here is the whole comparison in a single view.
| Dimension | Anki | NeuraKnow |
|---|---|---|
| Setup | Moderate to high: note types, deck options, sync account, add-ons, scheduler settings | Near-zero: open the app and make a card |
| Learning curve | Steep at first; rewards the investment | Minimal; sensible defaults out of the box |
| Algorithm | FSRS (default since 2023); legacy SM-2 optional | FSRS (built in from the start) |
| Privacy & data | Optional AnkiWeb account; synced data stored on Anki's servers (local-only if you never sync) | Fully on-device: no account, no cloud, no ads, no analytics, no tracking |
| Sync across devices | Yes — free via AnkiWeb (desktop, Android, iOS) | No — on-device by design |
| Shared decks | Vast ecosystem (AnKing, language decks, and more) | None — you make your own cards |
| Media & cloze | Images, audio, video, cloze deletion, HTML/CSS styling | Text questions and answers (no media or cloze yet) |
| Customization | Extensive: custom note types, templates, add-ons | Minimal by design |
| Platforms | Windows, Mac, Linux, Android (free); iOS AnkiMobile (one-time ~$25) | iOS and Android |
| Price | Free on desktop & Android; iOS ~$25 one-time; sync free | Free on both; optional "buy me a coffee" |
| Best for | High-volume, long-term study; power users; tinkerers; cross-device or desktop | Remembering what you read; quick capture; anyone who bounced off Anki; the privacy-minded |
How to choose
Choose Anki if…
- You are studying for something big and high-volume — medical school, the bar exam, a language to fluency.
- You want to download proven shared decks like AnKing rather than build your own from scratch.
- You need images, audio, or cloze deletion on your cards.
- You study across devices, especially at a desktop, and want free sync between them.
- You enjoy customizing and tuning your tools — or you already have an Anki deck you love.
Choose NeuraKnow if…
- You have bounced off Anki before, or its setup put you off starting at all.
- You mostly want to remember what you read — books, articles, courses — not maintain a large structured deck.
- You want to make a card in seconds and trust the schedule without configuring anything.
- Privacy matters to you, and you would rather nothing left your device.
- You are on an iPhone and would rather not pay, or you simply want the least complicated way to start.
You do not have to pick just one
These are not rival religions. Plenty of people use both, and it is a sensible setup: Anki for the big, structured, long-term deck you are serious about — a curriculum, a language — and NeuraKnow for the quick, low-friction capture of things you meet while reading, where opening a desktop app and choosing a note type would mean the thought is gone before you record it. The two philosophies coexist happily on the same phone.
The honest bottom line
If you already run Anki and love it, keep going. You are using one of the finest learning tools ever built, and nothing here is a reason to switch. But if you have tried it and stalled, or you have read this far precisely because the setup always felt like more than you wanted to take on, that instinct is worth trusting. The best spaced repetition system is the one you actually open tomorrow.
If you want the science without the setup, NeuraKnow is free on iOS and Android, built on FSRS, with the defaults already sensible and nothing to log into. Make a card, review when it asks, and let the spacing do the rest. And if Anki turns out to be the better fit for you, that is a good outcome too — the goal was never a particular app. It was to stop forgetting the things you cared enough to learn.