Learn English,All in One Free App.

From the 2,500 words that unlock 90% of daily English, to AI practice, live English Voice Rooms with real people, and shadowing — everything you need to learn English is in one free app.

Catlangu app screens — vocabulary lessons, AI practice, and voice rooms

Every tool you need, in one English learning app

From your first lesson to your first real conversation — everything in one place, nothing to install separately.

Learn English Vocabulary — 2,500 Core Words

Learn English Vocabulary — 2,500 Core Words

Every word comes with its meaning, a translation, and a real sentence — all with audio pronunciation. Type it, then say it out loud until it sticks. That's how vocabulary becomes something you actually use, not just recognize.

See how the 2,500 words are taught
Practice English with AI

Practice English with AI

Talk freely with Ava, your AI partner who adapts to your level and corrects you as you go — or rehearse 65 real-life scenarios like a job interview, a doctor's visit, or ordering food. Text or voice, always in character.

Explore AI English Practice
Practice English with Real People, Instantly

Practice English with Real People, Instantly

Practice your English anytime you want, with real people inside the app. One tap starts a live voice call — talk as long as you like, and skip to someone new whenever you want. No scheduling, no waiting.

See how Quick Match works
English Speaking Groups — Practice Online, Together

English Speaking Groups — Practice Online, Together

Join a group of English speakers just like you, and jump into live voice calls to practice speaking together — up to 8 people at once. Ask questions, laugh at your mistakes, and help each other get better.

English Shadowing Practice

English Shadowing Practice

Speak English fluently using the Shadowing technique. Listen to native YouTube videos, repeat sentence by sentence, and build real pronunciation and fluency.

Explore English Shadowing
English Community Feed

English Community Feed

Join 300,000+ English learners already practicing together. Post in English — text, photos, or voice notes — and get real feedback and corrections from others in the comments.

Chat, Correct Each Other, Call to Practice

Chat, Correct Each Other, Call to Practice

Make friends who actually help you improve — they'll fix your English right in the chat, and you can call each other to practice speaking whenever you're ready.