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Korean Voice👑 Premium
💡 Hyunsu voice pronounces English naturally.
English Voice👑 Premium
🇺🇸 US
Regional
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⚙️ Playback Options
Rest between chapters
📚 My Library
Downloaded book list & delete is provided in the mobile app first.
🎙️ Voice Engine
⚡✓ Active
Free Edge TTS (MP3)
Web preview · 24kHz
🎧 Web is a free preview
EdgeTTS MP3 (24kHz) cuts highs above 12kHz, limiting speed-listening and consonant clarity. Sibilants blur at 3-4x speed.
👑 Full features in the app
• Azure HD WAV (48kHz) — highs preserved to 24kHz • BrainHZ 7-stage training (ultrasonic, 40Hz gamma) • 66 books offline · hearing-age test
🔑 Sign in with Google to sync progress & study groups. HD voice · BrainHZ · 66 books are in the app.
TTS Server Status
Vercel Edge TTS
⏳Checking
Railway Backup
⏳Checking
Currently using:Browser TTS
Turbo Settings
Current speed → +1x → +2x → Back to start
Ex: Start at 2x → 2x → 3x → 4x → 2x (3 steps)