Lucy OS1 builds free AI language tools that give you precise, instant data about your English level, speaking habits, and fluency gaps. Every tool works in your browser, returns results in under five minutes, and requires no account. Use them to find out exactly where you are, then use Lucy OS1's AI speaking practice to close the gap.
Check your MCER level in Spanish. 15 grammar and vocabulary questions, A1 to C1. Instant result.
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Find your CECRL French level. 15 targeted grammar and vocabulary questions from A1 to C1. Free.
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Paste any passage and count exactly how many filler words it contains per minute of speech.
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Measure your words per minute in English or your target language. See if your pace is ideal.
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Traditional language assessments require scheduling, fees, and often travel to a testing centre. AI-powered language tools give you the same quality of diagnostic insight in minutes, from your browser, for free.
The data from Lucy OS1's tools is calibrated to international language standards including CEFR for English and MCER for Spanish and French. The results are accurate enough to guide your study and practice decisions, and can complement formal exams like IELTS, TOEFL, or DELF.
Once you know your level, daily AI conversation with Lucy OS1 is the most efficient way to move up the scale. Lucy OS1 adapts to your exact CEFR level and speaks with you in real time, which builds the spoken fluency that neither test preparation nor grammar study alone can provide.
What are AI language tools?
AI language tools are browser-based tools that use artificial intelligence to measure and analyse your language skills. Lucy OS1's tools include a CEFR English level test, a speaking pace analyser, and a filler word counter. Unlike traditional language apps, AI tools give you precise, data-driven feedback on specific skills rather than general practice exercises.
Are these AI language tools free?
Yes. All tools on this page are completely free to use in your browser with no account or registration required. You receive your result instantly after completing each tool. Lucy OS1's free tools are funded by the AI speaking practice service, which is also free to start with no subscription required.
How do AI language tools compare to apps like Duolingo?
AI language tools like those from Lucy OS1 are diagnostic and analytical, they tell you where you are and what to work on. Apps like Duolingo are practice-focused, they give you exercises to repeat. The two are complementary: use an AI language tool to find your CEFR level and identify your gaps, then use AI speaking practice with Lucy OS1 to close those gaps through daily real-world conversation.
What CEFR levels do the tools cover?
The AI English Level Test covers all five practical CEFR bands: A1 (Beginner), A2 (Elementary), B1 (Intermediate), B2 (Upper Intermediate), and C1 (Advanced). The test is calibrated so that learners at any level receive an accurate result, not a result skewed by questions that are too easy or too hard for them.
Lucy OS1 adapts to your language level and speaks with you every day. Real-time voice conversations build the fluency that reading and grammar study alone cannot.
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