Show HN: A tool to check username availability across social medias and domains

Kinda underwhelming considering it only checks four services and gives priority to random TLDs. But the idea itself has always been useful when doing naming/branding work.

Also: <a href="http:&#x2F;&#x2F;isvaliduser.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;isvaliduser.com&#x2F;</a>