WhoisAPI is described as 'The premier provider of freshly parsed whois data for domain names and IP addresses, also providing IP to geolocation, HTML to PDF, and domain availability RESTful HTTP APIs. Billing is performed on a pay as you go basis, free monthly use' and is an website in the photos & graphics category. There are more than 25 alternatives to WhoisAPI, not only websites but also apps for a variety of platforms, including Windows, Self-Hosted, Linux and Mac apps. The best WhoisAPI alternative is JsonWhois.io, which is free. Other great sites and apps similar to WhoisAPI are ip.me, DomainTools, Active Whois Browser and WebCargo.