Finally, an app that trains you to use Polish cases, built for the complexity of this language.
Fleksja teaches each word with all its forms, then makes you pick the right one in real sentences, until it comes out without thinking.
So you download an app and open it on the bus. It hands you ready-made sentences to fill in or put in order.
You try a case ending. Wrong. You try another. Right, but you couldn't say why.
Tomorrow it's a new sentence, a new ending, and the same guess.
Fleksja shows you how each ending works, then makes you choose it in real sentences, until it comes out on its own.
Seven cases, and a different ending for each.
Each case has its own endings. They change again for masculine, feminine and neuter nouns, for adjectives, and for verbs, depending on whether the speaker is a man or a woman.
Cases aren't hard to understand. They're incredibly hard to actually use.
You can recite the table, but mid-sentence your brain goes blank and you pick an ending at random.
You read the definitions, close the book, and nothing sticks.
Reading grammar feels like progress. Without practice that makes you produce the form, it fades in a week.
Many apps focus on words, not on endings.
Vocabulary gets the attention. The endings, where Polish actually gets hard, are often left to guesswork.
Every Polish noun, adjective and pronoun changes its ending depending on its job in the sentence. Fleksja trains exactly that moment: the sentence is in front of you, and you have to pick the form.
| MianownikNominative | kto? co? | kot |
| DopełniaczGenitive | kogo? czego? | kota |
| CelownikDative | komu? czemu? | kotu |
| BiernikAccusative | kogo? co? | kota |
| NarzędnikInstrumental | z kim? z czym? | kotem |
| MiejscownikLocative | o kim? o czym? | kocie |
| WołaczVocative | o! | kocie |
Every exercise is a sentence with a gap. You choose the ending yourself, which is exactly what you have to do when you speak.
The wrong options are the endings learners genuinely mix up, and after each answer you see why the case is needed.
Spaced repetition tracks each ending, not whole lessons, so you review what you miss right before you'd forget it.
Fleksja mixes three things that research shows work. We use them on the hardest part of Polish: the endings.
Adults learning a language with case endings, like Russian, tend to do better when they understand how the system works, not just when they copy examples. Knowing the mechanism helps you choose the right form, and know why.
Read more: Brooks & Kempe, 2013 · Kenanidis et al., 2023
Choosing the answer yourself, rather than just reading it, helps you remember it for longer. Research on practice testing finds it works better than re-reading, especially when you get feedback. That's why Fleksja makes you choose the ending.
Read more: Donoghue & Hattie, 2021 · Opitz & Kubik, 2024
Spaced repetition means reviewing over several days instead of in one sitting. Combined with focused practice, it helps your brain consolidate what you've learned. Each time an ending comes back just before you'd forget it, it settles more firmly. Fleksja brings each ending back at that moment.
Read more: Cepeda et al., 2006 · Smith & Scarf, 2017
Research on language learning apps and games focuses mostly on vocabulary, and much less on grammar. In Polish, where the endings carry so much meaning, that leaves the hardest part to guesswork.
Read more: Ishaq et al., 2021
This is research on how people learn, not a test of Fleksja. We built the app on top of it.
Every flashcard shows the word with all its case forms, plus aspect pairs for verbs. Free, from your first day at A0.
A sentence with a gap and four real endings to choose from, plus a short grammar explanation of why the right one is right. The wrong options are the mistakes learners actually make. Free too.
Spaced repetition brings back the exact endings you got wrong, right before you'd forget them.
Reserve a plan now, keep its launch price and get a 14-day free trial at launch. Nothing is charged today.
Learn words and practise the endings.
or €39.99 / year · save 44%
14-day free trialPractise as much as you want.
or €79.99 / year · save 44%
14-day free trialA coach that knows your weak spots.
Fleksja is still being built. Reserving means we email you at launch, with your price locked in. Paid plans start with a 14-day free trial. No card, no payment today.
Not yet. Fleksja is in development for iOS and Android. Leave your email and you'll be among the first to get it.
No. We don't ask for a card and we don't take any payment until the app exists. Reserving tells us which plan you want, and we'll hold that price for you at launch.
Plus and Premium start with 14 days free, so you can try everything before paying. Fleksja isn't launched yet, so for now you only reserve your spot and price. No card needed today.
That's what Premium is for: exam prep for the Polish state certificate at B1 and B2, with practice simulations. Free and Plus cover the grammar and vocabulary foundations.
Any level from A0 to B2. Beginners start with flashcards and the most common cases. If you already know the theory, you go straight to the drills.
Most language apps are built around vocabulary and everyday phrases, and general flashcard tools leave you to build the cards yourself. Fleksja is built around one thing: producing the correct case ending in a sentence, with spaced repetition on the forms you miss.
Practice with no grammar leaves you guessing. Grammar with no practice leaves you with rules you can't use. Fleksja gives you the rule after each answer, then asks you again and again at the right time.
Yes. Flashcards include perfective and imperfective pairs, and Plus adds conjugation drills across tenses.
Free flashcards and drills at launch. One email when the app is ready, nothing else.
Flashcards and drills are free at launch. We'll email you once, when Fleksja is out on iOS and Android.
We'll email you when Fleksja launches.