Echoin Privacy Policy

Effective date: September 23, 2026

Developer and privacy contact: Gouyang (苟阳). Email: gouyang2020@gmail.com.

Echoin is an iOS English listening practice app. This policy explains what Echoin processes and what it does not collect when you use the app.

Summary

Echoin does not require an account or login.
Audio, transcripts, word timestamps, and LRC files are processed and stored on your device.
Echoin does not upload your audio, transcript, or LRC content to a server.
Echoin does not include advertising, analytics, cross-app tracking, or cloud synchronization.

Information processed on your device

When you choose an audio file, Echoin copies it into the app’s private storage so that it can decode, transcribe, and play the file. The app may create transcript lines, word timestamps, and LRC files from that audio. These files remain in the app’s local storage.

Echoin also stores app preferences locally, such as your language choice, selected transcription model, and playback mode. These preferences are not sent to us.

Optional model downloads

Tiny and Base transcription models are included in the app. Small and Large models are optional downloads. If you choose to install one, the model file is downloaded over HTTPS from Hugging Face and stored locally on your device.

Echoin does not include your audio, transcript, or LRC content in a model download request. Hugging Face may process standard technical information needed to deliver a web request, such as an IP address, under its own terms and privacy policy. See Hugging Face’s Privacy Policy.

Support requests

If you contact us through GitHub Issues, GitHub may process your account information and the information you choose to include in your message. Please do not post private audio, transcripts, or other sensitive information in a public issue.

Retention and deletion

Local audio, transcript, and LRC files remain on your device until you delete them in Echoin or delete the app. Downloaded models can be removed from the model management screen. Deleting the app removes its local sandbox data according to the normal iOS deletion process.

Children

Echoin is a general-audience educational app. We do not knowingly collect personal information from children.

Changes to this policy

We may update this policy when Echoin’s data practices change. The effective date at the top of this page will be updated when a new version is published.

Contact

For privacy questions, email gouyang2020@gmail.com. You can also visit the Echoin Support page or open an issue in the Echoin legal repository.