Finally, a vocabulary app that
gets language learning right.
Language Den is the only vocabulary app built from the ground up for language learners. Spaced repetition that actually works. Flashcards that understand how languages work. And it's completely free..
Free forever. No account required. No ads. No tracking. No catch.
Let's be honest. You've tried other apps. They didn't work.
You downloaded Duolingo. You kept the streak going for a while. But then you realized you were spending 20 minutes a day matching pictures to words you already knew. You weren't learning. You were playing a game.
Maybe you tried Anki. People on Reddit swear by it. So you downloaded it, opened it up, and... stared at a screen that looks like it was designed in 2006. Because it was. You tried to make a card. Then you had to learn about "note types" and "card templates" and "deck options." You just wanted to learn some vocabulary.
Or maybe Quizlet. Clean interface. Easy to use. You made some flashcards, studied them, felt great. Two weeks later? Gone. All of it. Because Quizlet has no spaced repetition. It's a tool for cramming before an exam, not for actually learning a language.
Sound familiar?
The problem isn't you. The problem is that none of these tools were built for what you're actually trying to do.
Think about how much time you've already wasted
Hours configuring Anki decks instead of actually studying. Days maintaining a Duolingo streak that taught you nothing useful. Weeks re-learning the same words on Quizlet because they never stuck in the first place.
And here's the worst part: you know how you should be learning vocabulary. You know spaced repetition works. You know flashcards are effective. You just haven't found an app that does it right for language learning.
Every day you spend fighting the wrong tools is a day you could have spent actually building your vocabulary.
There's a better way. It's called Language Den.
Language Den is a vocabulary app built exclusively for language learners. Not a generic flashcard tool that you have to bend into shape. Not a game that wastes your time. A focused, purpose-built app for one thing: helping you learn and remember vocabulary in any language.
Every feature exists because language learners need it. Nothing exists because a product manager thought it would look good on a feature list.
Here's what makes Language Den different from everything else
Spaced repetition that actually works (without a manual)
Spaced repetition is the single most effective technique for long-term memorization. This isn't debated. It's settled science. The problem is that most apps either don't have it (Quizlet) or make you configure it yourself (Anki).
Language Den uses FSRS, a modern algorithm that's more accurate than what Anki has used for the past 20 years. It tracks how well you know each word and schedules your reviews at the exact moment you're about to forget.
You don't configure anything. You don't tweak settings. You don't install add-ons. You just review your cards and the app handles everything else.
Result: you remember more words while spending less time studying.
Any language you can type. Seriously, any.
Duolingo supports about 40 languages. Sounds like a lot until you realize yours isn't on the list. Even if it is, you're stuck with their curriculum. You can't learn your own words.
Anki technically supports everything, but you have to find or build all the content yourself.
Language Den works with any language you can type. Spanish, Japanese, Arabic, Korean, Swahili, Welsh, Tagalog, Uzbek, Navajo, Esperanto. It doesn't matter. There's no fixed list. If you can type it, you can learn it.
Learning a less common language? You get the same experience as someone learning Spanish. No compromises.
Built specifically for how languages work
Anki doesn't know the difference between a vocabulary card and a geography card. Quizlet doesn't either. They're generic tools.
Language Den understands that language learning has specific needs. Definitions in context. Natural example sentences. Conjugation patterns. Multiple card types so you can learn the same word from different angles.
This is what "built for language learners" actually means. Every feature is designed around how you learn vocabulary, not how you memorize random facts.
Takes 30 seconds to get started. No account needed.
Never lose a word again
You're watching a show in your target language. Someone says a word you don't know. You think "I should look that up later." You never do. The word is gone forever.
Language Den's Quick Notes fix this. Hear a new word? Open the app, type it in (or record the audio), and close it. Done. Two seconds. Later, when you have time, process your notes into full flashcards with a single tap.
Every word you encounter becomes a word you can learn. Nothing slips through the cracks.
Images that make words stick
There's a concept in cognitive science called the "picture superiority effect." Your brain remembers images dramatically better than text. It's not even close.
Language Den has built-in image search powered by Unsplash. Find a photo that captures the meaning of a word and attach it to your card. When you review, that visual anchor helps cement the word in your memory in a way that text alone never will.
Your data. Your device. Your iCloud. That's it.
Most apps want your email, your name, your usage data. They track what you study, when you study, and how you study. Then they sell that data or use it to push you toward a subscription.
Language Den doesn't do any of that.
There's no account to create. Your data syncs through your personal iCloud, and it never touches anyone else's servers. Start a review on your iPhone, finish it on your iPad. No ads. No tracking. No analytics SDKs.
Just an app that does its job and leaves you alone.
Still not sure? Compare for yourself.
Here's Language Den side by side with the tools you've probably already tried.
| Language Den | Anki | Duolingo | Quizlet | |
|---|---|---|---|---|
| Spaced repetition | FSRS (latest algorithm) | SM-2 / FSRS | Basic | None |
| Learn your own words | Yes | Yes | No | Yes |
| Language-specific features | Built-in | Manual setup | Fixed curriculum | None |
| Modern iOS experience | Native iOS | Dated UI (paid) | Yes | Yes |
| Import Anki decks | Yes | Yes | No | No |
| Price | Free | Paid on iOS | Free (with ads) or paid | Free (with ads) or paid |
| Account required | No | Optional | Yes | Yes |
Already invested in Anki? You don't have to start over.
If you've spent months or years building Anki decks, that work isn't wasted. Language Den imports .apkg files directly. Your cards come with you into a modern app that's actually designed for language learning.
You can also import from CSV files or add words manually. However your vocabulary lives right now, Language Den can work with it.
You keep everything you've built. You just get a better tool to learn with.
Get started in under 60 seconds
No sign-up forms. No onboarding wizards. No email verification. Here's the entire process:
Download the app
It's free. Open it. That's it. There's no account to create.
Add your first words
Type a word, import an existing deck, or capture something with Quick Notes. However you want to start, start.
Build your flashcards
Add definitions, example sentences, conjugations, and images. Create them yourself, or optionally let AI do it for you.
Review and remember
Spaced repetition does the rest. You just show up, review your cards, and watch your vocabulary grow.
You'll be reviewing your first cards in under a minute.
Imagine this
It's three months from now. You open Language Den for your morning review. It takes ten minutes. The app shows you exactly the words you need to see today. Not the ones you already know. Not random ones. The ones you're about to forget.
You get through the stack. Some words are easy now. They used to be hard. Some are still tricky. The app knows that and will show them to you again soon.
You close the app. Ten minutes. And in those ten minutes, you've reinforced hundreds of words. Words that are actually sticking this time. Words you'll remember next week, next month, next year.
That's not a fantasy. That's how spaced repetition works. And Language Den makes it effortless.
The best time to start building your vocabulary was a year ago. The second best time is right now.
You might be wondering...
"Is it really free? What's the catch?"
There is no catch. Language Den is free to download and free to use. No subscription. No paywall. No "premium" features locked behind a monthly fee. The free version will always be free.
"What's FSRS? Is it better than what Anki uses?"
FSRS (Free Spaced Repetition Scheduler) is a modern, open-source scheduling algorithm. It's more accurate than SM-2, which Anki used as its default for over 15 years. FSRS adapts to your personal memory patterns and schedules reviews more efficiently. You don't need to know any of this to use the app. It just works.
"Does it have AI features?"
Yes, as an optional extra. You can connect an OpenRouter API key to auto-generate flashcard content like definitions, example sentences, and conjugations. But the app is fully functional without it. AI is there if you want it. It's not required.
"What if my language isn't supported?"
It is. Language Den works with any language you can type. There's no fixed language list. If your keyboard can produce the characters, Language Den can teach you the words.
"I have years of Anki decks. Can I bring them over?"
Yes. Language Den imports .apkg files directly. You can also import from CSV. Your existing work comes with you.
"Do I need to create an account?"
No. Language Den uses your existing iCloud (Apple ID) for syncing. There's nothing to sign up for. Open the app and start learning.
"What if I don't like it?"
Delete it. It's free. You haven't lost anything. But give it a week of daily reviews first. That's when spaced repetition starts to click, and you'll feel the difference.
You have two choices right now
Option one: Close this page. Go back to whatever app you've been using. Keep fighting with clunky interfaces, missing features, and tools that weren't built for language learning. Keep forgetting words you've studied three times already.
Option two: Download Language Den. It takes 30 seconds. Add your first words. Start a review. Feel what it's like to use a vocabulary app that was actually built for what you're trying to do.
It's free. There's no risk. There's no account to create. There's nothing to lose except the words you keep forgetting.
Stop forgetting. Start learning.
Free. No account. No ads. No tracking. Built for language learners.
Download Free on the App StoreAvailable on iOS. Download takes seconds.