Privacy policy

Last updated: 28 October 2026

Chatterling is a language-speaking app made by Criosoft. It is built so that your learning stays on your device. This page explains what the app does with your data.

What we collect

Nothing. Chatterling has no accounts, no analytics, no advertising and no tracking. Criosoft runs no servers that receive data from the app. We cannot see what you practise, how you sound or how you are doing.

What stays on your device

Your profile and progress. The languages you chose, your goal, your phrase history, streaks and settings are stored in the app's own storage on your device and in your device backups. Deleting the app deletes them.

Voices and models. Natural voices are downloaded once and kept on your device.

What your device sends to Apple

Chatterling uses Apple's own services, which Apple's privacy policy covers.

Speech recognition. When you speak, the app asks Apple's Speech framework to transcribe you. Where your device supports on-device recognition for that language, the audio never leaves your device. For some languages recognition runs on Apple's servers; audio is sent to Apple for transcription only and is not stored by Chatterling.

On-device intelligence and translation. Suggestions, glosses and role-play lines are produced by Apple Intelligence and Apple's Translation framework on your device. Translation language packs are downloaded from Apple when you accept the download.

Purchases. Subscriptions and the lifetime purchase are handled by the App Store. We receive no card details or personal information.

Notifications. Practice reminders are local notifications scheduled on your device; nothing is sent anywhere.

The tutor, speech and translation, in detail

Before you first use Live, free talk or a suggested situation, the app shows a notice that repeats the points below and asks you to agree.

What is sent. Your spoken words (as audio, for transcription) and, for the tutor, the situation you type and the lines of the current conversation. Never your progress, your name or anything that identifies you; the app has no account.

Who receives it. Only Apple, through the Speech framework, Apple Intelligence and the Translation framework on your device. No third-party AI service is used, and Criosoft receives nothing.

Where it runs. On your iPhone wherever iOS allows it; for languages without on-device speech recognition, Apple's servers transcribe the audio and do not keep it, under Apple's privacy policy.

Your choice. Decline the notice and those features stay off; lessons, Review and guided Talk work without them.

What your device downloads from others

Natural voices are open-source models fetched from the sherpa-onnx project's GitHub release pages. That download is an ordinary file request to GitHub, which sees your IP address like any website; it carries no information about you or your learning.

Microphone

The microphone is used only while you are recording a phrase, and only after you have given permission. Recordings are kept in memory for scoring and discarded; nothing is saved.

This website

This site is a set of static pages. It sets no cookies, loads nothing from third parties and keeps no visitor records beyond the ordinary server logs of the hosting provider.

Children

Chatterling does not knowingly collect any personal data from anyone, including children.

Changes

If this policy changes, the new version is published here with a new date.

Contact

Questions about privacy go to [email protected]