Learn English
with Casie

Books, translation, and AI speaking - all designed to improve your English naturally.

🔄 Translation 📖 Books 🗣️ Speaking
🚀 Launching May 2026
App Store Start Learning Free
00:00 / 00:30

Sample: Jibby Jones Book

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Read Books

Classic and modern literature with integrated audio. Read along, listen, or do both - at your own pace with adjustable speed.

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Listen Book

Immersive audiobook experience with synchronized text. Follow along as the narrator reads, or just listen and absorb.

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Practice Speaking

AI-powered conversations that adapt to your level. Get instant feedback on pronunciation and build confidence naturally.

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Translate Instantly

Tap for instant translation. Build vocabulary naturally while staying immersed in the content.

Book Reader Book Player Speaking Translate
Book Reader Book Player Speaking Translate
01 / 04

Read Books

Classic literature with integrated audio.

02 / 04

Listen Book

Immersive audiobook experience.

03 / 04

Practice Speaking

AI-powered conversations.

04 / 04

Translate Instantly

Tap for instant translation.

Meet Our AI Tutors

Friendly voice companions for speaking practice

Asteria

Asteria

American

Clear, confident, knowledgeable voice

Athena

Athena

British

Smooth, calm, professional

Orpheus

Orpheus

American

Trustworthy and professional

Angus

Angus

Irish

Casual, friendly, patient

Arcas

Arcas

American

Natural, smooth, clear

Why Casie?

Everything you need to go from beginner to fluent - in one app.

🔄

Smart Translation

Instant translation with context-aware suggestions. Learn vocabulary naturally while reading books.

📖

Read & Listen Together

Books with synchronized audio. Read along, listen only, or switch between both. At your own pace.

🗣️

AI Speaking Coach

Free-talk with an AI tutor. Get instant feedback on your English, topic suggestions, and build real confidence.

Choose Your Plan

You can cancel anytime in your profile.

Free

$0

Read books

  • Book reading
  • Public domain library

Premium

$4.99/month

Everything you need to master English.

  • Everything in Free
  • Translation
  • Audiobook listening
  • Speaking practice
  • AI conversation feedback

Start Learning English Today

Free to download. No commitment required.

App Store Start Learning Free