Last updated 25 October 2026
Harmonic Calendar privacy policy
The app works offline. No accounts, advertising, tracking or app analytics.
This policy covers Harmonic Calendar and its widget on iPhone, iPad and Mac. The developer and privacy contact is Jakub Stanio, jquuub@gmail.com.
Information stays on your device
Harmonic Calendar calculates dates locally. The app does not collect or transmit personal data. It uses the device’s date, time and time zone, works offline, and requires no account. It does not access your location, contacts, calendar events or reminders.
The widget’s H/G selection is saved in local preferences shared by the app and widget. It is not sent to the developer or synced by the app across devices. Browsing dates does not send your selections to a server.
No app tracking or advertising
The app has no advertising or analytics service and does not sell or share personal data. Its fonts are bundled for offline use. External links open your browser or email app, where the destination service’s privacy practices apply.
Apple services and local data
Apple separately operates the App Store and may process download information, diagnostics or backups according to your settings and Apple’s privacy policy.
Use the widget’s H/G control to change its saved selection. There is no developer-hosted account or data profile to delete. Your operating system and Apple settings manage local app data and backups.
Support email
If you email support, you provide your email address and whatever message or attachments you send. This information is used to respond and investigate the issue. Email is handled through Gmail, provided by Google.
Support correspondence is retained only as long as needed to handle your request and applicable recordkeeping obligations. Contact jquuub@gmail.com to request access, correction or deletion under applicable law. Please send only what is needed to explain your issue.
This website
Visiting jquub.com is separate from using the offline app. Cloudflare hosts this website and may process IP addresses and request logs to deliver and secure it. The portfolio uses PostHog for website usage analytics, such as page visits and browser/device information, and may store a browser identifier. This website analytics is not included in Harmonic Calendar. See Cloudflare’s privacy policy and PostHog’s privacy policy.
Policy updates
If the app’s privacy practices change, this policy and the relevant App Store disclosures will be updated. For privacy questions, email jquuub@gmail.com. For help using the app, visit support.