The best alternatives to DomainFox are Domainr, Domain Comet, and ZEIT. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of DomainFox?
AssemblyAI— Multilingual Speech-to-Text API with superhuman accuracy
The fastest way to find a relevant domain for your new project. Every TLD, any registrar. The r stands for research. “I love domainr on there like every day haha”
Domain Comet makes it easy to monitor your own domains, your client's domains or the domains that you might like to purchase one day. We monitor registration details (registrar, status, expiry date), SSL certificates (validity and expiry) and number of pages indexed in Google.