Built for serious listeners
Every feature in Echo is built around one goal: turning any document, article, or URL into a narrator you can actually listen to for hours.
Kokoro Voice Engine, Customized Narrating for Listening
Echo is built on a Kokoro-based neural voice engine that runs entirely on your device — and what you hear is not the stock model. Getting an AI voice to survive an eight-hour novel is a different problem from getting it to read a sentence in a demo. We have spent months rebuilding the pipeline around long-form listening: pronunciation, prosody, pacing, emphasis, voice character, and playback continuity are all tuned independently and together. The specifics stay under the hood. The result is a narrator you can actually listen to for hours.
- On-device synthesis
- Tuned for long-form listening
- No gaps between chunks
- Holds up over hours
Reads Anything You Can Throw At It
Echo reads PDFs, EPUBs, DOCX and RTF, plain text, Markdown, and HTML. Paste a web URL and it fetches the page, extracts the main article, and reads only the content — headlines, navigation, comments, ads, and cookie banners stripped out. Share text or a link from any other app on your phone and Echo starts reading instantly. A built-in element blocker lets you tap any remaining junk on a rendered page to hide it, and remembers your picks per-domain, so each site gets cleaner every time you visit.
- PDF, EPUB, DOCX, RTF
- TXT, Markdown, HTML
- URL article reader
- Per-domain element blocker
Voice and Pronunciation Control
Real books are full of words a stock TTS engine stumbles on: fantasy names, foreign loanwords, Latin, technical jargon, medical vocabulary, regional spelling variants, and the long list of English words that change pronunciation depending on meaning. Echo ships with a deep pronunciation layer that handles them, plus context-sensitive logic refined against thousands of passages from real books. Anything it still gets wrong, you fix once in your personal dictionary and it stays fixed. Pick from the voice roster, or customize your narrating — blend any two voices into a narrating style that is yours, or load a curated character or accent preset. Enunciation and pacing are exposed as real controls, not hidden defaults.
- Customized narrating for listening
- Personal pronunciation dictionary
- Context-aware handling
- Enunciation and pacing controls
The rest of the toolkit
Smaller features that start to matter once you're hours into a book.
Full-Screen Reader with Word Highlighting
A large-type scrolling reader mode with word-level highlighting synced to the audio. Every word lights up at the instant it is spoken — read along, or just listen.
Bookmarks, Resume, and Chapters
Save any point in any book and jump back instantly. Echo also remembers your position automatically, and detects chapters in EPUBs, PDFs, and plain text for quick navigation.
Sleep Timer
Drift off to a book. Stop after a set duration or at the end of the current chapter — whichever feels right for the night.
Background Playback
Keep listening while you use other apps, exercise, cook, or commute. Audio keeps playing with the screen off and holds time accurately.
Community Library and Authors
Browse and submit shared audiobooks, read book detail pages with star ratings and reviews, follow author profiles, and see author updates and announcements in a social feed.
Free Public-Domain Books
Built-in search across Project Gutenberg and LibriVox gives you tens of thousands of classic titles, ready to listen to in a tap.
Offline Mode
Once the voice engine is loaded on your device, narration works without an internet connection. Perfect for flights, road trips, and remote areas — where cloud TTS apps stop working.
Unlimited Listening
No credits, no character caps, no per-hour metering. The voices run on your phone, so listening costs nothing extra — and we never charge you for it.
Privacy Focused
Narration runs on your device. Your documents are never uploaded for read-aloud, and nothing leaves your phone unless you explicitly submit it to the community library.
Frequently asked questions
What can Echo read?
Echo reads PDF, EPUB, DOCX, RTF, plain text, Markdown, and HTML documents. It also reads web articles — paste any URL and it extracts just the main content. You can also share text or a link from any other app on your phone and it will start reading.
Is Echo free to use?
Yes. The free tier includes the full neural voice roster, every supported format, and unlimited offline listening — no credits, caps, or metering. An optional Premium plan ($9.99/mo or $59.99/yr) adds the signature narrator voices Atlas and Sterling.
Does Echo limit how much I can listen?
No. Because the voices run on your device instead of on cloud servers, there is nothing to meter. Unlike cloud TTS apps that sell credits and cap your hours, Echo gives you unlimited listening on the free tier.
How does the AI voice technology work?
Echo is built on a Kokoro-based neural voice engine that runs entirely on your device. The engine has been extensively customized around long-form listening — pronunciation, prosody, pacing, and voice character are all tuned for real books rather than short demos.
Can I listen offline?
Yes. Once the voice engine is loaded on your device, narration works without an internet connection. Your saved books are always available offline.
Can I customize how words are pronounced?
Yes. Echo ships with a deep pronunciation layer that handles fantasy names, loanwords, technical jargon, and words whose meaning changes how they sound. If it ever gets a word wrong, you can add a fix to your personal pronunciation dictionary and it stays fixed for every book you read.
Can I customize the voice?
Yes. Every user gets customized narrating: pick from the full free voice roster, blend two voices into your own narrating style, or load a curated character or accent preset. Enunciation and pacing are exposed as real controls. Premium adds the signature narrators Atlas and Sterling on top.
Is there a reader view?
Yes. A full-screen reader shows large scrolling text with word-level highlighting synced to the audio. Bookmarks, chapter navigation, and automatic resume are built in. A sleep timer lets you stop after a duration or at the end of a chapter.
Ready to start listening?
Echo is coming soon to Google Play — free, with the neural voices included. Join the waitlist to be first in line.
Get Early Access