This is so awesome, it easily is my newest favorite tool and I can't believe you plan to keep it free. I just noticed a similar product that charges upfront per project... Thanks, but no thanks. I love your trademark check and social handles feature. 555 Stars! As a guy with a lot of domains I only have one improvement suggestion: that you maybe could extend the buy button with more registrars, or auto suggest the cheapest one like domcomp or TLD-list but that's just because I'm not such a big fan of Namecheap and would love to support you by being able to buy through more registrars via your link. ;)
