How we protect your data.
HolidayStacks is designed with privacy at its core. The optimization engine runs entirely within your browser. We do not store, track, or collect your personal calendar data, selected dates, or vacation strategies on our servers.
We use Nager.Date as our public holiday API provider. Your selected country and region are transmitted to this API solely to fetch the relevant public holidays for your calculation.
We may use your browser's local storage to remember your country and PTO preferences so that you do not have to re-enter them on subsequent visits. This data remains on your device and is never transmitted to us.
We use aggregated analytics tools (Vercel Analytics, Google Analytics, and PostHog) to improve our service and help us better understand how to develop this project further. For our users in the UK and European Economic Area (EEA), we employ a strictly opt-in cookie policy. We use geographic routing to detect your region and will not deploy tracking cookies to your device without your explicit consent via our banner. If you decline, we will only collect anonymised, cookieless metrics.