Contact
One address: hello@sunprotect.me. There is no contact
form, because SunProtect.me has no <form> element anywhere — see
privacy for why that is deliberate.
A result that looks wrong
This is the message worth sending, and it gets read first. Say what you set the two sliders to, which answers you gave, and what you expected instead. Nothing is stored, so the settings cannot be looked up — the description is the whole report.
A better source
The guidance here traces to three organisations, listed on the about page. If one of them has updated its advice, or if there is a primary source that contradicts something on this site, that is worth an email. A link to the source itself is more useful than a summary of it.
Anything else
Corrections to the writing, accessibility problems, and things that render badly on a device I do not own are all welcome. What is not: requests to add affiliate links, to recommend a product, or to publish a sponsored page. The site recommends no sunscreen and is not going to start.