Read along while listening to audiobooks with word-by-word synchronization
Screen mirroring for iPhone and Mac to Chromecast, Google TV, Samsung and LG TVs
Stage
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Founded
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Based in
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Pricing model
Free
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Pricing
Free core features including read-along text, device transcription, offline functionality, and public-domain library. Optional Pro upgrade for advanced analytics.
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Key features
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
Mirror entire iPhone or Mac display to TV
Cast video files in full quality without re-encoding
Automatic TV discovery on Wi-Fi network
No app or account required on TV
Audio-only casting mode
Adaptive quality based on Wi-Fi strength
Menu bar integration on Mac
Converts unsupported video formats while playing
No data collection or servers
What makes it different
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
No ads in core experience
Only app that enables iPhone screen mirroring to Chromecast without AirPlay
No account, setup or TV app installation needed
Automatic network discovery works across multiple TV brands
Preserves full video quality when casting files
Privacy-focused with no servers or data collection
Relayo