Stop typing translations, genders and conjugations by hand. Add a word, and Noos completes the card for the language you're learning.
to learn
a car
a firefly
grumpy
a squirrel
cozy
In short
Making a good flashcard by hand is slow. Look up the translation, check the gender, find an example sentence, type out the conjugation, then start over for the next word. Noos is a flashcard app that does that part for you: add a word, and the phonetics, real examples and conjugation tables fill themselves in.
“Because building a card takes seconds instead of minutes, that time goes back into learning the language.”
Powered by the FSRS spaced repetition algorithm, Noos learns your personal memory curve and times each review right before you'd otherwise forget, so retention lasts.
Five steps
Click on the "Create a stack" button. Give your stack a name and description, add your target language. Done! You are ready to add up your vocabulary!
Once your stack is created, you can seamlessly add built-in blocks such as synonym, slang or case blocks to create the perfect flashcard. The best part? You do not even fill blocks yourself. Our AI does the heavy lifting!
2 modes: Standard or Intelligent. Use standard mode to review your stack regardless of whether you already know your flashcards or not. Use intelligent mode to review your stack with our advanced FSRS algorithm to optimize long-term retention.
Your dashboard shows your review streaks and memory retention across all your stacks. Manage your knowledge and increase it on a daily basis.
Every Stack created can be made available for the community. You can also explore stacks from other Noos users and import them directly into your library.
Under the hood
FSRS (Free Spaced Repetition Scheduler) is a state-of-the-art open-source algorithm developed from decades of memory research. Unlike older systems that rely on population averages, FSRS models your individual memory curve.
This means the schedule adapts to you: how fast you forget, how quickly you recover, and how well certain types of cards stick. The result is fewer wasted reviews and deeper, more reliable retention.
Who it's for
Learning a language on your own? You set the pace, so every minute has to count. Noos cuts out everything that isn't learning.
No curriculum to follow? Begin with our free frequency lists, the 5,000 most common words in nine languages, or pick a ready-made stack. You learn the words you'll actually hear first.
Picked up a new word from a series, a book or a conversation? Add it, and Noos fills in the translation, gender, examples and conjugation. Your study time goes into learning, not typing.
Nobody sets your homework, so the FSRS algorithm does: each day it picks the cards you're about to forget and skips the ones you know. 10 minutes a day is enough to keep moving.
Learning alone, it's hard to tell if you're improving. Your dashboard tracks your streak and memory retention across every stack, so you always know where you stand.
Good to know
No. You can study any public stack and use the free word lists without signing up. To create your own vocabulary and keep your progress, create a free account. The Free plan is all you need.
Noos adapts to your pace. Even 5–10 minutes a day is enough to make meaningful progress. The algorithm ensures you only see the cards that matter most on any given day.
You can build stacks in 9 languages: English, French, German, Spanish, Russian, Polish, Italian, Japanese and Mandarin Chinese. The app itself is available in the first six. More languages are on the way.
Yes! Every feature is free right now, with no card and no trial period. Paid plans will come later.