Echo

May 6, 2026 ยท View on GitHub

Available on the iOS App Store and the macOS App Store.

Hear yourself and native speakers to improve pronunciation.

Language practice / speech pathology / accent reduction

Purpose

This app can help you improve pronunciation. Whether that is for speech pathology, accent reduction or studying a new language. It is extremely effective. This app does not intend to teach you all the vocabulary you need, it is not a language app, it is a pronunciation app.

See also my other app for speech pathology: formant-analyzer

Intro

This iOS app provides the same functionality as the website learnwithecho.com.

It is my first serious iOS app and has gone through siginificant development over the years. It has been successful and brought in good money since 2008 or so, and I hope you can study it for your own benefit or to contribute improvements.

License

You are welcome to read and study everything here. All contents (c) William Entriken, all contributions require assigment for this copyright. Will consider a more permissive license later.

Release a new version

This project uses fastlane and App Store Connect API key authentication for release automation.

One-time setup

  1. Install Ruby via rbenv (macOS system Ruby is too old for fastlane):

    brew install rbenv ruby-build
rbenv init # follow the printed shell setup instructions, then restart your shell
rbenv install   # installs the version from .ruby-version
bundle install

  2. Create fastlane/api_key.json:

    {
  "key_id": "ABCD123456",
  "issuer_id": "00000000-0000-0000-0000-000000000000",
  "key_filepath": "/absolute/path/to/AuthKey_ABCD123456.p8"
}

The pipeline has five stages.

flowchart LR
  bump_version --> b["beta (TestFlight)"] --> screenshots --> upload_screenshots --> r["release (App Store)"]

Execute the end-to-end flow with the combined command:

bundle exec fastlane full_release # may add options from any part below; or it picks defaults

Or run each stage separately:

bundle exec fastlane bump_version           # may add bump:minor or bump:major
bundle exec fastlane build                  # every platform, or add platform name before verb
bundle exec fastlane beta                   # every platform, or add platform name before verb
bundle exec fastlane screenshots            # every platform, or ...; may add locales:... devices:...
bundle exec fastlane upload_screenshots     # every platform, or ...; may add locales:... devices:...
bundle exec fastlane release                # every platform, or ...; may add notes:"This release..."

Screenshot filter examples:

bundle exec fastlane screenshots platforms:ios locales:en-US devices:"iPhone 16 Pro"
bundle exec fastlane upload_screenshots platforms:mac locales:en-US devices:"Mac"

:information_source: release is submit-only. Run screenshots and upload_screenshots first if screenshots need to change.

:information_source: If a beta upload fails because the build number is behind App Store Connect, set the project build number once to remote highest + 1, commit, rerun, then continue local increments.

Each command part (and the end-to-end command) will print this evidence as available: