🇨🇿 Czech · CEFR C1

Czech C1 Course

The 5500–8000 most common Czech words, frequency-ranked and spaced-repetition drilled — the vocabulary backbone of CEFR level C1 (Advanced).

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A1 → A2 → B1 → B2 → C1 → C2

5500–8000

Czech words in this level

SRS

Spaced repetition

CEFR-aligned by frequency

10,000

Full Czech deck, A1–C2

Any

Device — web, iOS, Android

What Czech C1 Actually Means

At CEFR C1 (Advanced), you can understand demanding, longer material, pick up on implicit meaning, and express yourself fluently and spontaneously on complex subjects.

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Words 5500–8000

Our Czech deck is ranked by real corpus frequency. C1 maps to words 5500 through 8000 — exactly the vocabulary a C1 learner is expected to know, no more, no less.

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Vocabulary, Not a Full Course

This is the vocabulary track for C1 — frequency-ranked words, IPA phonetics, and bilingual example sentences. Pair it with a grammar resource, class, or exchange partner for a complete C1 course.

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One Deck, Every Level

Your subscription includes the full 10,000-word Czech deck, so moving from C1 to C2 is just continuing the same deck — no new purchase, no new app.

How the C1 Track Works

Frequency research meets spaced repetition — the most efficient combination in vocabulary science.

Start at word 5500

Your Czech deck opens at the C1 threshold. Every card is ranked by frequency, so you always study the most useful word first.

Study 20 minutes a day

Spaced repetition resurfaces each Czech word at the moment you're about to forget it — long-term retention, not cramming.

Clear word 8000, you're at C1

Once you've studied through word 8000, you hold the vocabulary base CEFR C1 assumes — and your deck keeps going toward C2.

Every Czech C1 Card Includes

Five data points per word — not just a translation.

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Frequency Rank

Know exactly how common each word is in real Czech speech and writing — the same ranking that defines the C1 threshold.

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IPA Phonetics

Every entry includes the International Phonetic Alphabet pronunciation. Hear it right the first time, every time.

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Bilingual Example Sentences

Each word appears in a native-language sentence with an English translation — real context, not invented examples.

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Grammar Information

Part-of-speech tags, noun gender, verb conjugation classes — exactly the grammatical context C1-level Czech requires.

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Spaced Repetition

Proven SRS algorithm schedules each card at its optimal interval for long-term retention.

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All Devices

Study on web, iOS, Android, Windows, or Mac. Your C1 progress syncs automatically across every device.

Want a physical reference for C1? Browse our Czech frequency dictionaries — printed vocabulary books with the same frequency-ranked data, IPA, and bilingual examples.

Start Czech C1 Today

Every plan includes the full 10,000-word Czech deck — A1 through C2 — plus all 12 languages. No hidden fees. Cancel anytime.

Monthly

€29.95/month

Cancel anytime

Czech A1–C2 + all 12 languages
10,000 frequency-ranked words
IPA phonetics + example sentences
Spaced repetition system
Web app — iOS & Android coming soon
New languages as they launch

Frequently Asked Questions

Is this a full C1 course, with grammar and speaking practice?

No — this is the vocabulary track for C1: frequency-ranked Czech words, IPA pronunciation, grammar tags, and bilingual example sentences, drilled with spaced repetition. Most learners pair it with a grammar course, class, or conversation partner. Vocabulary is consistently the biggest bottleneck to reaching C1, so this is where a structured deck moves the needle fastest.

How do you know which words belong to C1?

Word frequency and CEFR level track closely — the more common a word is in real Czech text, the earlier a learner needs it. Our deck is corpus-ranked from word 1 (the most common Czech word) to word 10,000, and we map that ranking onto the standard CEFR bands: C1 sits at words 5500–8000.

Do I get access to other levels and languages too?

Yes. Every plan includes the entire 10,000-word Czech deck — A1 through C2 — plus all 12 languages currently in the app, not just C1. Additional languages are added to your account automatically as they launch.

How is this different from Duolingo or a language school's C1 class?

Unlike Duolingo, we focus entirely on vocabulary, ranked strictly by frequency instead of gamified drip-feed order. Unlike a class or exam-board wordlist, our Czech deck comes professionally curated with IPA pronunciation, bilingual example sentences, and grammar data already attached to every word. It's the structured, data-driven vocabulary layer underneath whatever course or class you're taking.

Can I cancel my subscription?

Yes. Monthly and yearly plans can be cancelled at any time from your account settings. You keep access until the end of your current billing period. The lifetime plan is a one-time payment with no recurring charges.