Three kinds of tool, and why the vocabulary ones come in pairs
What is collected here falls into three groups. Hangul Quiz teaches a writing system. Irregular Verbs Quiz drills a closed grammatical set. Sentence Memorizer works on whole texts. The remaining seven all deal with vocabulary, and they are deliberately split by what they can and cannot establish.
A vocabulary size test asks you to report which words you know and estimates a total from that, which is fast but inflated by words you half-recognise. A vocabulary check mixes real words with invented ones and scores both halves, so claiming everything lands you at chance level — it produces a lower and more defensible number. The Vocabulary Quiz does something different again: it asks for meanings rather than recognition, and teaches while it tests.
Both of the first two exist for English, Korean and Spanish, so you can measure the same thing across three languages with the same method and compare the results honestly.
Where to start
- Starting Korean from zero: the Hangul Quiz. It is an alphabet of forty letters, and most learners can sound out written Korean within a day or two.
- Fixing English past tenses: the Irregular Verbs Quiz. The wrong options are the mistakes learners actually make, not random words.
- Wanting a number you can trust: a vocabulary check in your language. It cannot be inflated by optimism.
- Wanting to learn rather than measure: the Vocabulary Quiz, which shows the correct meaning after every miss.
- Learning a speech, lines or a passage word for word: the Sentence Memorizer, which works on text you paste in yourself.
What it means to know a word
Knowing a word is not a single state, which is why the tools here give different answers about the same person. You can recognise a word on sight without being able to define it, define it without being able to use it, and use it in writing without ever saying it aloud. A size test catches the widest of these, a check catches a narrower one, and a quiz asking for meanings catches narrower still.
None of them measure production, which is the ability to retrieve a word when you need it in conversation — and that is usually the gap people notice in themselves. If your scores are high but speaking is hard, the problem is not the size of your vocabulary. Reading grows recognition; speaking and writing are what turn recognition into retrieval.
Frequently asked questions
Can I really learn Hangul in a few days?
Reading it, yes — Hangul is a featural alphabet of 40 letters designed to be easy to learn. Most learners read slowly within 2–3 days of short quiz sessions; speed comes with practice.
Which irregular verbs are covered?
The 100 most frequent English irregular verbs, in two sets: the essential 50 (go/went/gone, take/took/taken…) and the full 100. Distractors include the fake regular form (goed) — the exact mistake learners make.
Is my custom text private in the sentence memorizer?
Yes — text you paste is processed entirely in your browser and never uploaded anywhere.
Why memorize whole sentences instead of single words?
A sentence carries grammar, word order and natural word combinations along with the vocabulary — things a flashcard word can't give you. When you need the language later, you recall a ready-made pattern instead of assembling words one by one. That's why the memorizer hides sentences progressively rather than quizzing isolated terms.
Do quizzes actually help me learn, or just measure what I know?
They help — this is the well-documented testing effect: actively retrieving an answer strengthens the memory far more than rereading it. Getting a question wrong helps too, because the correction right after an attempt sticks unusually well. That's why every tool here is quiz-shaped instead of being a list to reread.
What's a good daily routine with these tools?
Keep it to five or ten minutes: one Hangul round if you're learning Korean, one set of irregular verbs for English, then a pass through the sentence you're currently memorizing. Short daily sessions beat a long weekly one — frequency is what moves language into long-term memory.