You came across webapp-run.us and want to know if it's safe. The honest answer is that we can't tell, and that's the problem. This domain was registered less than a week ago, and the site itself is built as a single-page app that loads content via JavaScript, so automated checks can't see what's on the page or find contact details. For any site that might ask you to sign up, share data, or pay for something, that level of opaqueness is a serious warning sign.
Here's what stands out. The domain has legal pages like a privacy policy and an EU-required business disclosure, which is more than many brand-new sites bother with. But the registrant is listed as an individual with a personal Gmail address, no company name, and no phone number. Combined with zero history in the Wayback Machine or any online reputation, there's simply not enough evidence to prove this is a legitimate business.
Most legitimate services that ask for your trust have been around longer than 5 days, have contact information you can verify, and show up in search or social media. Webapp-run.us doesn't meet any of those baseline checks. Until it builds a track record, the safest move is to wait or look for a more established alternative. There are no confirmed webapp-run.us reviews from real users out there, and this site's design makes it hard to tell if it's a new startup or something else entirely.