Cosmic Scale — Privacy Policy
Effective 13 October 2026 · applies to the website cosmic-scale.com
Cosmic Scale ("the site") is a free web version of the Cosmic Scale app. This policy explains what information the site handles.
What the site itself collects
Nothing about you. The site has no accounts, no sign-in and no database of its own. What it remembers is kept in your browser's local storage: the language you chose, your settings, which simulations you have unlocked and when timed unlocks expire. It never leaves your browser, and you can delete it at any time by clearing this site's data in your browser. The site sends no crash reports.
Visit statistics
The site counts page views with Vercel Web Analytics, so we can see which pages people read. It uses no cookies and stores nothing in your browser. For each page view it receives the page address, the referring site, your browser, operating system and device type, and your country, which is worked out from your IP address. The IP address itself is not stored, and visits cannot be linked across days or across sites. The figures are only ever seen as totals. See Vercel Web Analytics privacy.
Your approximate location (optional)
The Sky screen can tell you which eclipses you can see from where you are. Only if you tap "Use my location" does the site ask your browser for your location. It is rounded to about 10 km, kept only in your browser, and used only to work out what is visible from there; the sky is computed in your browser. It is never sent to us or to anyone else. You can remove it with "Forget my place" on the Sky screen, or revoke the permission in your browser settings.
Advertising
The site is free and shows ads through Google AdSense. Google, as a third-party vendor, uses cookies and similar technologies to serve ads on this site. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the Internet. To serve and measure ads, Google may process information such as cookie identifiers, your IP address (from which approximate location can be inferred), browser and device information, and your interactions with ads.
You can opt out of personalised advertising in Google's Ads Settings, or opt out of some third-party vendors' use of cookies for personalised advertising at aboutads.info. How Google uses this information is described in How Google uses information from sites or apps that use its services and the Google Privacy Policy.
If you are in the European Economic Area, the UK or Switzerland, the site asks for your consent through a Google-certified consent message before personalised ads are shown, and you can change your choice at any time from the privacy choices link in the site.
Photos from space agencies
When you open an object's details, the site loads real photographs directly from the servers of NASA (nasa.gov), ESA/Hubble (esahubble.org), ESA/Webb (esawebb.org), ESO (eso.org) and NSF NOIRLab (noirlab.edu). Like any website, those servers receive your IP address and a standard request for the image, nothing else. Their own privacy policies apply to those requests.
Sounds from space missions
When you tap Listen, the site streams that sound from NASA (nasa.gov), the Chandra X-ray Center (chandra.harvard.edu) or the University of Iowa (uiowa.edu). Those servers receive your IP address and the request, nothing else. Nothing is streamed until you tap Listen.
Hosting
The site is hosted by Vercel. Like any web host, Vercel's servers process your IP address and standard request details to deliver the pages, under Vercel's privacy policy.
Children
The site is not directed at children under 13 and does not knowingly collect personal information from them.
Changes
If this policy changes, the new version will be posted at this address with a new effective date.