Language learning
Vocabulary is the easy half, and every app on the market handles it the same way — your words come back for review until they stick. Nobody does that for grammar. You get an explanation once, somewhere around lesson four, and then you're on your own. Nauk treats every rule — each case ending, each tense, each agreement — as something to be practised, tested and brought back on the same schedule as your vocabulary.
You can finish an entire course tree with a few thousand words in your head and still be unable to form a correct sentence. The vocabulary was rehearsed hundreds of times; the grammar appeared in a tooltip you clicked past. Nothing ever checked whether it stayed with you.
You can recite when to use the dative and still freeze mid-sentence choosing an ending. Reading grammar and producing grammar are different skills, and only one of them is the one you need in a conversation. Nauk trains the second.
Four things, and as far as we know no other app does the first two at all.
Every rule you meet becomes a tracked item with its own review schedule, exactly like a vocabulary card. Rules you're shaky on come back sooner; rules you've mastered fade into the background. Your grammar is remembered on purpose, not by accident.
When you get an answer wrong, Nauk works out which rule you got wrong — not just that the sentence was incorrect. Then it schedules that rule for practice and builds you exercises that target it. No more re-reading a whole chapter to find the one thing you keep missing.
Multiple choice lets you pass by elimination. Nauk asks you to produce the form — write it, build it, say it — because that's the skill that transfers to actually speaking. Grammar you can operate, rather than grammar you can recite.
Explanations and comparisons start from the language you already speak. A Polish speaker learning German is shown where German cases behave differently from Polish ones — not handed a translation of a course written for English speakers.
Conventional courses are written one direction at a time: English→Spanish is one product, Spanish→English is another, and Polish→Greek is a product nobody will ever fund. Ten languages taught in both directions means ninety separate courses to write and maintain, which is why they don't exist.
Nauk models each language once. Adding a language adds one model, and every learning direction it can pair with comes with it. Ten languages is ninety directions; the eleventh language adds twenty more on its own. Growth is linear where the market's is quadratic — and it means we can serve pairs no publisher would touch.
The first ten, each available as both a language you learn and a language you learn from.
More to follow, including languages written in other scripts.
Nauk is being built by Ivan Jokić, based in the Netherlands. If you teach languages, want to partner, or just want to be told when the beta opens — say hello.