Who we are
Dayyoo is a language-learning product owned and operated by Flyosim LLC. This policy explains how we handle information when you visit dayyoo.com or use the Dayyoo app.
Information Dayyoo may use
The exact information depends on the features you choose to use.
- Learning preferences and activity, such as your selected language and level, saved words, review results, progress, streak, reminder settings, and Yoo’s Room activity, inventory, and balances. Account features synchronize relevant learning records with our service.
- Account information, such as your email address, account name, internal account identifier, and sign-in provider. An email account name may be derived from your email address; a sign-in provider may supply a name or profile image. Email sign-in uses a stored password hash, not a readable copy of your password.
- Session and security information, such as sign-in and installation identifiers, session times, IP address, device or browser description, and records used to prevent abuse and protect your account. Content downloads and website requests also send connection information to our hosting providers.
- When you use an available purchase feature, purchase and entitlement information supplied by Apple, such as product and transaction identifiers, subscription state, renewal state, and expiration date. Flyosim LLC does not receive your full payment-card number.
- If crash diagnostics are enabled for a release, redacted crash and diagnostic information is used to keep Dayyoo reliable. Dayyoo does not use advertising identifiers, cross-app tracking, session replay, or precise location.
- Messages you send to support, including the contact information, attachments, and details you choose to provide. We also keep account-email and delivery records for verification, password recovery, security notices, and deletion confirmations.
How we use information
- Provide word cards, practice, progress, widgets, reminders, and other requested learning features.
- Remember your settings and, when enabled, synchronize progress across your devices.
- Maintain security, diagnose errors, prevent abuse, verify purchases, and keep Dayyoo reliable.
- Respond to support requests and communicate important service or policy updates.
Local and offline learning
Dayyoo stores downloaded learning content, preferences, and learning state on your device. Guest learning is stored locally. Signing in can link guest progress to your account for synchronization. Removing the app or its data may remove progress that has not been synchronized.
Supported offline activities use installed content and queue account progress for later synchronization. Reading a downloaded word does not require uploading its text. Typed quiz answers are graded locally; the learning engine sends structured results rather than the raw text you typed.
Audio, notifications, and widgets
Dayyoo may use on-device speech features to pronounce words and examples. Reminder notifications are scheduled only after you grant permission and can be changed or disabled in Dayyoo or iOS Settings. Widgets display selected learning content on your device.
Purchases and payments
Where Dayyoo Plus or Sparks purchases are available, Apple processes payment through the App Store. Apple supplies signed transaction and subscription-status information so Dayyoo can grant the purchased entitlement or balance, restore supported purchases, prevent duplicate credits and fraud, and handle refunds or revocations. Apple’s privacy policy and account settings govern its billing services. This policy does not promise that a purchase feature is available in every build or region.
Advertising and optional diagnostics
Dayyoo does not sell personal information or use it to track you across other companies’ apps and websites for advertising. The current app does not export product analytics to an analytics service. Learning records sent to run account features are separate from optional analytics.
A release configured for crash reporting can send redacted technical error information to Sentry. That reporting excludes account details, request contents, screenshots, session replay, and raw typed answers. Device and operating-system information may accompany a crash. Whether reporting is enabled depends on the release configuration.
Service providers and disclosure
Dayyoo uses Render for application and database hosting, Vercel for the website, Cloudflare for content delivery, and Resend for account-email delivery. Apple, and Google when that sign-in option is available, process information for the account or purchase services you choose. Sentry receives redacted diagnostics only in releases where it is configured. Information you email to us is processed by our email service. These services may process information in countries other than the country where you live.
We share the information needed to operate those services. We may also disclose information when required by law, to protect users or Dayyoo, or in connection with a business transfer subject to applicable privacy requirements.
Retention, security, and your choices
Account and cloud learning records are kept to provide your account features. Account deletion removes the account and its linked cloud learning records through a background process. Some records are separate from the account, including email-delivery and support records, deletion receipts, security logs, and billing-event records. Those records and backup copies may remain after account deletion; deleting an account does not mean every operational record is immediately erased. Retention depends on the purpose of the record and applicable obligations, rather than one deletion period for every type of data.
You may change learning and notification settings at any time. While signed in, start deletion in Settings → Manage account → Delete account → Continue, type DELETE, then confirm Permanently delete account. An accepted request disables account access and revokes active sessions while cloud deletion is processed. Where applicable, the process also revokes Sign in with Apple authorization. A completion email is queued when deletion finishes. Local learning remains on your phone as guest data. Deleting the app or your Dayyoo account does not cancel an Apple subscription.
For access, correction, deletion, or other privacy requests, email privacy@dayyoo.com. Applicable local law may provide additional rights.
We use safeguards designed to protect information in transit and storage, but no system can guarantee complete security.
Children
Dayyoo is not directed to children under 13, or the minimum age required by local law to consent to data processing. If you believe a child provided personal information without appropriate permission, please contact us so we can review and delete it where required.
Changes and contact
We may update this policy as Dayyoo evolves. We will post the revised policy here and update its effective date. For privacy questions or requests, email privacy@dayyoo.com.