Anki out of the box is already one of the most powerful study tools available. But the add-on ecosystem is what turns it from a solid flashcard app into a fully customized learning machine. There are thousands of add-ons in the Anki repository, which is both a blessing and a problem. Most of them are outdated, niche, or redundant. Finding the ones that actually matter takes time you could be spending on studying.
This guide covers the 15 add-ons that are genuinely worth installing in 2026. These aren't obscure tweaks. They're the plugins that thousands of top-performing students (especially in medical school) rely on daily. If you're new to Anki or you've been using it vanilla, this list will change how you study.
How to Install Anki Add-ons
Before we dive in, the quick version: open Anki, go to Tools > Add-ons > Get Add-ons, and paste the code listed for each add-on below. Restart Anki after installing. That's it.
Some add-ons have settings you can configure through Tools > Add-ons > (select add-on) > Config. We'll note when that matters.
Scheduling and Algorithm
1. FSRS Helper
Code: 759844606
This is the single most impactful add-on you can install right now. FSRS (Free Spaced Repetition Scheduler) is a modern scheduling algorithm that replaces Anki's default SM-2 algorithm, which dates back to the 1980s. FSRS uses machine learning to optimize your review intervals based on your actual performance data.
What does that mean practically? Fewer reviews for the same retention. Studies and user reports consistently show 20-30% fewer daily reviews compared to SM-2 with equal or better recall rates. When you're doing 300+ cards a day in medical school, saving 60-90 reviews is significant.
Anki 23.10+ has FSRS built into the scheduler settings, but the FSRS Helper add-on gives you additional tools: the ability to optimize parameters, reschedule existing cards, and fine-tune your desired retention rate. Most students set their desired retention at 0.85-0.90 (85-90% recall rate) and let the algorithm figure out the ideal intervals.
If you only install one add-on from this list, make it this one. We wrote a full guide on setting up FSRS if you want the details.
2. Custom Scheduling (Load Balancer)
Code: 1417170896
Once you've been using Anki for a while, you'll notice that some days have 400 reviews and others have 150. This happens because cards cluster around certain due dates based on when you started studying them. The load balancer spreads reviews more evenly across days by slightly adjusting intervals (within a range you control) so you get a consistent daily workload.
This is a quality-of-life add-on, not a learning optimizer. But consistent daily loads make it much easier to maintain the habit. Nobody wants to face a 500-card day on Monday when Tuesday only has 100.
Card Formatting and Display
3. Review Heatmap
Code: 1771074083
The review heatmap adds a GitHub-style contribution grid to your Anki home screen. Every day you study, the square fills in. Longer streaks and more reviews make the colors more intense. It sounds simple, and it is, but the psychological effect is real. Seeing a wall of green squares makes you not want to break the chain.
Beyond motivation, the heatmap gives you useful data at a glance: daily review counts, streak length, forecast of upcoming reviews, and historical patterns. You can spot when you fell off the wagon and when you were crushing it. For students who need to track consistency over months or years of board prep, this visual feedback is invaluable.
4. Edit Field During Review (Cloze)
Code: 385888438
You're reviewing a card and you notice a typo, or the wording is confusing, or you want to add a detail. Without this add-on, you have to exit the review, find the card in the browser, edit it, and go back. With this add-on, you click on the field during review and edit it in place. Changes save immediately.
This sounds minor until you realize how many small card edits you skip because the friction is too high. Bad cards accumulate. This add-on means you actually fix them when you notice them, which compounds into a much better deck over time.
5. Frozen Fields
Code: 516643804
When you're creating cards manually, Frozen Fields lets you "freeze" a field so its content carries over to the next card. If you're making 20 cards from the same lecture and they all share the same source or chapter tag, you freeze that field once and it auto-populates for every new card.
This is a card-creation speed multiplier. It's especially useful for students who make their own cards alongside pre-made decks, adding context-specific notes from their professors' lectures.
Image and Media
6. Image Occlusion Enhanced
Code: 1374772155
Image occlusion is the technique of covering parts of an image (anatomy diagrams, pathways, charts) and testing yourself on what's hidden. This add-on makes creating image occlusion cards fast and intuitive. You import an image, draw rectangles over the parts you want to test, and it generates individual cards for each region.
For anatomy, histology, pathology slides, and any visual subject, this is essential. It transforms diagrams from something you passively look at into something you actively recall. Medical students consistently rank this as one of their most-used add-ons.
If you're using SlideToAnki, our image occlusion feature works similarly but automates the process by detecting labeled structures in your lecture slides. The add-on is the manual equivalent for images you want to occlude yourself.
7. Paste Images As WebP
Code: 1151815987
A practical one. When you paste images into Anki, they default to PNG format, which is large. This add-on automatically converts pasted images to WebP, which is typically 50-80% smaller with no visible quality loss. Your collection stays smaller, syncs faster, and loads quicker on mobile.
If you use a lot of images in your cards (and you should, especially for visual subjects), this add-on saves significant storage over time. A medical student's collection with hundreds of anatomy images can easily hit several gigabytes. WebP compression keeps it manageable.
Efficiency and Workflow
8. Speed Focus Mode (Auto Alert/Auto Reveal)
Code: 1046608507
This add-on plays a sound or automatically reveals the answer if you spend too long on a card. You set the threshold (most students use 10-15 seconds). The idea is to prevent you from staring at a card for 30 seconds trying to remember something you clearly don't know. If you don't know it in 10 seconds, you probably need to see the answer and press Again.
Speed focus keeps your reviews efficient and prevents the "I'll just think about it a little longer" trap that can turn a 30-minute session into an hour. It's especially useful for students who are prone to overthinking or perfectionism during reviews.
9. More Decks Stats and Time
Code: 1556734708
The default Anki stats page is decent but limited. This add-on enhances it with additional metrics: time spent per card, retention rates by deck, mature vs. young card breakdown, and more detailed forecasting. It also adds a timer to your review screen showing how long you've spent on the current session.
For students managing multiple decks (AnKing, lecture-specific cards, personal cards), being able to see performance breakdowns by deck helps you identify which subjects need more attention. If your pathology retention is 75% but your pharmacology is 92%, you know where to focus.
10. BetterSearch
Code: 1052724801
Anki's built-in card browser search works, but BetterSearch makes it actually pleasant to use. It adds autocomplete, search history, saved searches, and a cleaner interface for building complex queries. When you have 20,000+ cards, being able to quickly find and filter is essential.
Want to find all cards tagged "cardiology" that you've gotten wrong more than twice in the last month? BetterSearch makes that query easy. The default browser makes it an exercise in memorizing search syntax.
Study Modes and Features
11. AnkiConnect
Code: 2055492159
AnkiConnect turns Anki into an API server, allowing other applications to create, read, and modify cards programmatically. On its own it doesn't do much. But it's the foundation that enables dozens of other tools and workflows.
Browser extensions can send vocabulary to Anki while you're reading articles. PDF readers can create cards from highlights. Custom scripts can bulk-edit or reorganize your collection. If you ever want to integrate Anki with anything else, AnkiConnect is the bridge.
12. Pop-up Dictionary (for Language Learners)
Code: 153625306
If you're using Anki for language learning, this add-on shows dictionary definitions when you hover over words on your cards. For Japanese, Chinese, Korean, and other languages, it can show readings, definitions, and example sentences without leaving the review screen.
This eliminates the context-switching of opening a separate dictionary app every time you encounter an unfamiliar word in context on your cards. It keeps you in the flow of reviewing.
13. Batch Editing
Code: 291119185
Select multiple cards in the browser and edit a field across all of them at once. Change a tag, update a source field, fix a formatting issue across hundreds of cards in seconds instead of one at a time.
You don't need this often, but when you do, it saves hours. Reorganizing decks, fixing systematic errors in card formatting, or adding a new field to an entire subdeck becomes trivial.
Appearance and Comfort
14. Advanced Review Bottom Bar
Code: 1136455830
Replaces the default answer buttons with a more informative bottom bar showing next review intervals, button counts, and remaining cards in a cleaner layout. You see exactly when you'll review the card again for each button (Again: 10min, Hard: 2.5d, Good: 6.8d, Easy: 15d) without needing to guess.
Knowing the exact intervals helps you make better grading decisions. If Good means 7 days and Easy means 30 days, you might grade differently than if you assumed they were closer together. Transparency in the scheduling makes you a better reviewer.
15. Night Mode / Dark Mode
Code: 1496166067
Long study sessions at night are hard on the eyes with Anki's default white background. This add-on gives you a proper dark mode with customizable colors. Most students who do evening reviews consider this essential.
Some newer Anki versions have basic dark mode built in, but this add-on gives you more control over the exact colors and contrast. If you're studying 2-3 hours a day, eye comfort matters.
Honorable Mentions
A few more worth knowing about:
- Hierarchical Tags (1089921461): Organize tags into nested folders. Essential once you have hundreds of tags.
- True Retention (613684242): Shows your actual retention statistics adjusted for the "Hard" button, which Anki's default stats don't handle well.
- Countdown to Events (1143540799): Adds a countdown timer to your exam date on the home screen. Simple but effective motivation.
The Minimal Setup
If 15 add-ons feels like too many, here's the essential five that cover the most ground:
- FSRS Helper (better scheduling, fewer reviews)
- Image Occlusion Enhanced (visual learning)
- Review Heatmap (motivation and tracking)
- Edit Field During Review (card maintenance)
- Advanced Review Bottom Bar (better grading decisions)
Install those five, and you've covered scheduling, visual content, motivation, card quality, and review efficiency. Add the rest as you discover specific needs.
Making Anki Work for You
Add-ons extend what Anki can do, but they don't replace good study habits. The best add-on setup in the world won't help if you're not doing your reviews consistently or if your cards are poorly written. Get the fundamentals right first: show up every day, write clear cards with single concepts, and use active recall honestly (don't peek at the answer and press Good).
If you want to skip the manual card creation entirely, SlideToAnki converts your lecture slides into Anki-ready flashcards automatically, including cloze deletions, Q&A cards, and image occlusion. Upload your slides, choose your settings, and export a deck file you can import directly into Anki with all of these add-ons working on top.
The goal isn't to spend time making cards. It's to spend time learning from them.