Last updated: 1 October 2026
Who we are
LetterMilo is made by Ho Ye Lam. This policy covers the iPhone and iPad app and lettermilo.com.
The app and website are provided by Kin-Yee, based in the Netherlands and registered at the Dutch Chamber of Commerce under number 75399423. For privacy questions, email hoyelam@kin-yee.com.
Learning and progress
LetterMilo does not require an account or ask children for their name, date of birth, or email address. The app stores practice progress, earned stars, Milo’s clothes, background choices, and settings on your device. These learning records are not sent to our analytics or crash-reporting services.
Your device’s backup settings may include app data in an iCloud or computer backup. LetterMilo does not provide its own account or cloud-sync service.
Microphone and speech
Speaking activities are optional. On supported devices, LetterMilo requests microphone permission and checks speech on the device using Apple’s on-device speech technology. LetterMilo does not save or upload microphone recordings or recognised words.
Listening starts after the word or sentence prompt and stops when you tap Stop or leave the exercise. For words, you can use tapping activities instead. For sentences, choose “We tried it together”. You can change microphone permission in device Settings. Apple may download language models before speech recognition is available. Milo’s narration is included in the app and plays locally.
Crash reports
The app automatically sends crash reports and app-session diagnostics to Sentry to help us find and fix technical problems. Reports can include app version, device and operating-system details, crash information, session timing, installation and session identifiers, and an app-specific hash derived partly from Apple's device vendor identifier. Sentry may derive an approximate region from the network connection. This information is sent to Sentry's US service.
Crash reports may include up to 50 recent technical steps, such as broad navigation, starting or ending an activity, saving progress, playing audio, preparing speech, loading purchase options, purchasing or restoring Full Library, changes in access, and sharing. Each step records only a fixed operation, outcome, and optional broad screen or technical reason. This helps us identify the steps before a crash.
We do not attach microphone recordings, recognised words, answers, individual lesson names or identifiers, saved learning progress, screenshots, or screen recordings. Purchase diagnostics do not include receipts, transaction identifiers, payment amounts, payment details, or your Apple Account. The app does not provide a separate switch for crash reporting.
App usage
LetterMilo automatically sends broad app-usage events to Mixpanel, together with app and device information and a random installation identifier. Events cover sessions, navigation, activity starts, completions and exits, purchase and restore outcomes, Full Library access changes, wardrobe actions, and sharing outcomes. We use them to understand which features are used and improve the app. They are sent to Mixpanel's EU service. IP-address geolocation is disabled.
These events do not include answers, scores, individual lesson names or identifiers, microphone recordings, recognised words, saved learning progress, or a child's name. Purchase events do not include receipts, transaction identifiers, payment amounts, payment details, or your Apple Account. The app does not provide a separate switch for app-usage analytics. Contact us using the details in this policy for privacy requests.
Website and support
This website does not include analytics scripts, advertising, contact forms, or tracking cookies. The sample word game runs in your browser. It does not use your microphone or save your answers. It is hosted on GitHub Pages. When you visit, GitHub receives information needed to deliver and protect the site, such as your IP address, requested page, browser information, and request time. GitHub may retain delivery and security logs. See GitHub’s privacy statement.
If you email us, we receive your email address, message, and any attachments you choose to send. We use this information to answer your request. Please avoid sending a child’s name, voice recordings, or other unnecessary personal information.
Your choices and rights
Parents and guardians can manage microphone permission, device backups, and the pictures they choose to share. Deleting LetterMilo and its app data removes progress stored by the app on that device; existing backups and previously shared pictures are managed separately.
Depending on applicable law, you may have rights to access, correct, delete, or obtain a copy of personal information, or to object to or restrict its processing. Contact hoyelam@kin-yee.com to make a request. Because LetterMilo has no accounts, we may need further information to locate relevant records. You may also complain to your local data-protection authority.
Changes
We will update this page when LetterMilo’s data practices change and show the date above. Where required, we will provide additional notice or request permission before introducing a change.