Vocabai builds vocabulary lists on your terms — by level, topic, register — and trains them four ways. Including a real conversation with an AI that knows your weakest words.
VocabChat reads your list. It knows which words you've mastered and which you stumble on. Then it engineers a conversation — restaurant order, salary negotiation, anything you describe — that pushes the words you actually need to surface. You speak. It listens. Your mastery grows.
CEFR level. Frequency band. Register. Part of speech. Pick a topic — 'hospital admissions German', 'startup investor pitch English' — Vocabai pulls the words that actually fit. From a 50,000-word map per language.
German 'scharf' means sharp, spicy, and risqué. Most apps lump them. Vocabai tracks each sense separately — its own mastery, its own example sentence, its own SRS schedule. You learn the language as it actually behaves, not as a dictionary lookup table pretends it does.
Vocabai isn't a course you finish. It's a vocabulary substrate you compose against — for whatever language, whatever level, whatever context you're heading into next.
Most apps treat 'bank' as one word. We track 'bank (river)' and 'bank (money)' as separate ideas with their own mastery.
You define the list. We don't drip-feed you a syllabus you didn't choose. Day one, full dictionary access.
Glosses, examples, fill-in-the-blanks — all rendered in your mother tongue, not generic English-pivoted definitions.
AI conversation that reads your list and steers you toward your weakest words. Two free a month. Pro unlocks daily.
Open SM-2 algorithm. Your mastery percentage maps to real retention probability, not gamified XP.
CSV. JSON. Anki-ready. Bring it in, take it out. Pro tier — never held hostage.
They give you a syllabus. We give you a substrate. Duolingo decides which words you learn and when; Vocabai lets you compose lists by topic, level, and register from day one. You're not waiting for a unit to unlock — you're building the vocabulary your life actually needs.
Practice modes are unlimited on Free. Pro unlocks the AI-heavy parts — daily conversations, custom lists, all languages at once.
Build the habit. No card.
Unlimited AI. Unlimited everything.
Billed annually · cancel anytime
Founder lifetime tier available — limited spots · See all pricing
Free to start. No card. No syllabus. Just the words you decide to learn — and a system that helps you keep them.