The short version: nothing about you leaves your browser.
Nothing. There are no accounts, no analytics, no tracking pixels, no cookies and no server that could record what you look at. The whole map is a set of static files; once the page has loaded, every country you click and every setting you change is computed on your own device.
One flag in localStorage remembering that you have seen the welcome panel, so it does not
reappear every visit. Your current view — the perspective, country, currency, home country and trip
settings — lives in the page’s own address, which is what makes a link shareable. Clearing your
browser data removes both.
One optional call to open.er-api.com for today’s exchange rates, so prices can be shown in your currency. It sends no information about you beyond the request itself, and if it fails the map falls back to bundled rates and carries on. Everything else — the geometry, the price data, the globe library — is served from this site.
This is a small independent project. Corrections to the price data are welcome, and the About & sources panel inside the map explains where the numbers come from and how far to trust them.