Privacy and browser storage

JetRhythm is designed to help you plan time-zone adjustments without creating an account. Core plan calculations and saved journeys remain in your browser.

What happens to your journey

Airport codes, flight times, sleep settings and calculated schedules are processed locally by JavaScript in your browser. We do not transmit saved journeys or sleep plans to our server. If you choose Find this flight, the flight number and departure date are sent to our Cloudflare Worker and, when a provider subscription is enabled, to AeroDataBox to retrieve a published flight schedule. The optional Save on this device button stores a journey in your browser's IndexedDB.

What is stored on your device?

IndexedDB: journeys you explicitly save, until you delete them or your browser clears site data.
Local storage: the shared Mightora header may remember your light/dark appearance preference when you change it.
Cache Storage: an optional service worker saves core application files to make the site available offline.

Browser data is not a secure backup. Private browsing often clears it on close. Export journeys as JSON if you want to keep a copy or move devices. Use the Delete buttons to erase saved journeys.

Cookies and analytics

JetRhythm itself sets no advertising cookies, analytics cookies or tracking identifiers. No third-party advertising or analytics is active in this release. Browser storage is used for explicitly requested functions and preferences. We provide this notice and control to delete stored plans. If we introduce non-exempt tracking later, the consent mechanism will be reviewed before activation.

Hosting and third-party resources

Cloudflare hosts the online website and the first-party flight lookup proxy. Like other hosts, it may process IP addresses, browser details and request metadata under its own policies. Shared Mightora components and styles are retrieved from jsDelivr and GitHub-hosted assets; those providers may receive normal request metadata. Live schedule requests, when enabled, pass the requested flight number and date to AeroDataBox. We cache public flight schedule responses at the edge for at most six hours. The lookup never sends your sleep schedule or saved plans.

Offline alternative

The downloadable standalone HTML embeds the code and branding. Opening it directly does not make application network requests. External links remain optional and open only if you choose them.

Contact and updates

JetRhythm is an open-source Mightora project by Ian Tweedie. For questions or issues, use the GitHub issue tracker. We will update this notice when functionality changes.

Last reviewed: 31 October 2026. This is a functional privacy statement, not a promise about how other websites or browser extensions process data.