Read along while listening to audiobooks with word-by-word synchronization
Stage
Not given
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Founded
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Based in
US
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Pricing model
Freemium
Free
Pricing
Free: $0, 20 minutes per month. Starter: $10/month, 8 hours per month. Pro: $20/month, 20 hours per month. Power: $39/month, 50 hours per month. Ultra: $79/month, 120 hours per month. Team/Enterprise: Custom pricing. Yearly plans save 30%.
Free core features including read-along text, device transcription, offline functionality, and public-domain library. Optional Pro upgrade for advanced analytics.
Key features
Real-time bilingual captions on any website with audio
Works with YouTube, Netflix, Twitch, Zoom, Google Meet, and more
Low-latency subtitles appearing in ~0.5 seconds
Dual subtitles showing original and translation simultaneously
No file uploads required
Privacy-aware audio processing
Shared team minute pool with per-member usage tracking
Team roles with clear permissions
Word-level synchronized text highlighting with 60fps
On-device transcription without cloud upload
Offline playback after single engine download
Support for 99 languages
Import multiple audio formats including MP3, M4B, FLAC, OGG
Accessibility profiles for dyslexia, ADHD, and vision impairment
Built-in library with 20k+ public-domain titles
Quote saving and sharing with generated cards
Reading analytics with neuroscience-based brain score
Character map feature for tracking book figures
What makes it different
Subtitles appear in ~0.5 seconds, fast enough for live streams
No manual file uploads needed
Universal browser compatibility with any audio tab
Dual subtitles showing both languages simultaneously
Built by a software engineer who uses it daily
Complete privacy with no account or cloud uploads required
No external lyrics database; transcription generated directly from your audio
Supports your own audiobook files without DRM restrictions
SonicCaption