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Echo

For Every Mind — turn listening into learning.

The audiobook player that helps you remember what you heard — word-perfect read-along, one-tap flashcards, and a study system built on the real science of memory.

iPhone Apple Watch Mac CarPlay Open source · GPL-3.0

Join the TestFlight beta View source

Echo Now Playing screen for The Merchant of Venice — The Novel, with its square audiobook cover and teal playback controls — **Colours from your cover.** *The Merchant of Venice — The Novel* gives the player its teal palette.

Echo chapter list for The Merchant of Venice — The Novel — **Find your chapter.** Browse *The Merchant of Venice — The Novel* one chapter at a time.

Echo reader showing the modern-English Merchant of Venice Novel, with the paused audiobook and its square Venice-arches cover — **Read in modern English.** The Novel's text, with audiobook controls close at hand.

Echo Apple Watch playback controls for The Merchant of Venice — The Novel, with its square audiobook cover — **Playback controls on Apple Watch.** The Novel's square audiobook cover stays in view.

Echo Apple Watch volume controls for The Merchant of Venice — The Novel, with teal accents — **Volume and chapter controls.** The Novel on Apple Watch.

Built on a mail route

I deliver mail — in and out of the car thirty times a shift, an aux cable, an Apple Watch, and an AuDHD brain that learns from non-fiction audiobooks in stolen, interrupted minutes. No app would loop a single chapter until it stuck, stay ready on a watch after a long pause, or remember why a bookmark was made three driveways ago.

So I built it, nights and weekends around a full delivery route — an app that treats audiobooks the way students treat textbooks. And if you're just here to listen? You never have to make a single flashcard.

Read-along is where most apps stop

Sync gets you to the page. Echo gets it into your head.

01
Chapter sync — table stakes. Match your audiobook to your ebook chapter by chapter. A growing crowd of apps does this; Echo does too.
02
Word-perfect read-along. Echo follows the narrator word by word — true karaoke, aligned on-device to the real audio (WhisperKit + CoreML), not snapped to the nearest chapter.
03
Turn it into memory. One tap makes any passage a spaced-repetition flashcard with its audio snippet attached — reviewed on iPhone, Watch, and Mac until you own it.

What Echo does

A serious study system, out of the way until you want it.

Everything below is in the current TestFlight beta unless marked — Echo is in open development toward 1.0.

Smart Rewind

Hit play and Echo has already rewound — a little after a short pause, more after hours. Interruptions stop costing you context.

Chapter Looping

Repeat one chapter until you own it — the feature Echo was born for. Or loop the exact passage between two bookmarks.

Built-in Spaced Repetition

An Anki-style flashcard system with FSRS / FSRS-4.5 scheduling and the narrator's audio on the cards — daily review, hands-free on Apple Watch.

Synced EPUB Reader

Text scrolls with the narration. Tap a paragraph to jump the audio; search the book and leap to the spoken moment.

Voice & Photo Bookmarks

Hold a button and speak your thought, or attach a photo of where you are — memos play back inline when the narration returns there.

A Watch Remote You Design

Up to 25 buttons across 5 pages, Digital Crown scrubbing, plus a Pomodoro focus timer on your wrist.

Built for CarPlay

Full Now Playing plus a browseable library — with in-dash buttons to bookmark, record a memo, or mark a passage on the road.

Pitch-Corrected Speed

Narrators sound human at 1.25× — zero pitch distortion, and every book remembers its own speed.

Dyslexia-Friendly by Design

Lexend and OpenDyslexic built in, Dynamic Type, VoiceOver labels. Designed for interrupted, neurodivergent attention first.

Mark Now, Card Later

One tap marks a passage without stopping the narration; the Card Inbox turns marks into flashcards when you have the bandwidth.

Second-Brain Export

One tap exports a book's bookmarks, notes, memos, photos, and flashcards as clean Markdown — straight into Obsidian, Logseq, or Notion.

On-Device AI Narration

Natural narration for text-only EPUBs, generated entirely on your device — no cloud, no API calls. Books never recorded can still be heard.

Insights That Are Real

Listening time, streaks, chapter coverage, retention curves — honest numbers from your actual listening, never from a server.

Radically private

Core playback and reading need no Echo account. Optional connected services have separate data handling. Read the Echo privacy policy.

Open source

GPL-3.0, public on GitHub — the whole app.

No locked files

Built around DRM-free files you own and can see.

For Every Mind

Designed for interrupted, neurodivergent attention first.

Echo Pro, once

Optional power features as a one-time unlock. No subscription.

Echo is in open beta right now.

TestFlight builds for iPhone, Apple Watch, Mac, and CarPlay — guides, test plans, and a devlog included.

Join the TestFlight beta Listen in your browser

User manual Learning guide Focus Field Guide Beta guide Devlog Help & support Sample learning audiobooks