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Learn 20 Languages with AI Pronunciation Grading
Koydo Lingua uses phoneme-level speech recognition, CEFR-aligned placement testing, and spaced repetition to teach real-world fluency. From first words at age 3 to C2 mastery for adults. Free to start, no credit card needed.
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Pronunciation Grading
Phoneme-level ASR feedback on every spoken response. See exactly which sounds need work, with mouth-position diagrams and native-speaker comparison waveforms.
CEFR Placement
Take a 15-minute adaptive placement test that maps you to A1 through C2. Track your progress across reading, writing, listening, and speaking with granular skill breakdowns.
20 Languages
Spanish, French, German, Japanese, Korean, Mandarin, Arabic, English, Portuguese, Italian, Russian, Dutch, Polish, Turkish, Vietnamese, Thai, Indonesian, Hindi, Greek, and Swedish.
Spaced Repetition
SM-2 vocabulary scheduling adapts review intervals to your personal forgetting curves. Cortex-powered memory modeling ensures you retain what you learn.
AI Conversation Partner
Practice with Aria, Koydo's AI conversation coach. Real-time dialogue at your level with gentle corrections, vocabulary suggestions, and cultural context.
CLIL Immersion
Learn subjects IN your target language, not just vocabulary lists. Study science in Spanish, history in French, or math in Mandarin for deeper acquisition.
All 20 Languages
Koydo vs Duolingo
| Feature | Koydo | Duolingo |
|---|---|---|
| Levels | A1 through C2 | A1 through B1 |
| Pronunciation | Phoneme-level AI grading | Correct / Wrong binary |
| Method | CLIL + full immersion | Translation drills |
| Error explanation | WHY + L1 transfer patterns | Just marks wrong |
| Speaking practice | AI conversation partner | Repeat-after-me |
| Price | Free test + $9/mo | Free (ads) or $6.99/mo |
“My daughter went from zero Spanish to reading chapter books in 8 months. The pronunciation grading caught accent mistakes that her school teacher missed.”
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Frequently asked questions
How is Koydo different from Duolingo?
Koydo teaches to C2 fluency, not just A1-B1 basics. Every spoken response gets phoneme-level pronunciation grading that shows exactly which sounds need work and why. Instead of translation drills, Koydo uses CLIL immersion so you learn subjects IN the target language. And Koydo explains errors by showing L1 transfer patterns, not just marking answers wrong.
Can my child learn English on Koydo?
Yes. Koydo Lingua includes English as a Second Language (ESL) with placement testing, pronunciation grading tuned for common L1 interference patterns, and age-appropriate content starting from age 3. The CLIL mode lets ESL learners study their school subjects in English for faster acquisition.
What CEFR levels does Koydo cover?
Koydo covers the full Common European Framework from A1 (beginner) through C2 (mastery). The adaptive placement test maps you to your starting level, and the curriculum progresses through all six levels with skill-specific tracking for reading, writing, listening, and speaking.
Is pronunciation grading available in all languages?
Pronunciation grading is available in all 20 languages. The ASR engine provides phoneme-level feedback with IPA transcription, mouth-position diagrams, and native-speaker comparison waveforms. Accuracy varies slightly by language, with the highest precision in Spanish, French, German, Japanese, Korean, and Mandarin.
Can I use Koydo for homeschool foreign language credit?
Yes. Koydo generates CEFR-aligned progress reports, tracks instruction hours, and produces printable transcripts that satisfy foreign language requirements in all 50 US states. Many homeschool families use Koydo as their primary foreign language curriculum from elementary through high school.