Free Domain Age Checker vs WhoisXML API
Quick answer
Looks up a single domain's real public registration date via RDAP/WHOIS, free. WhoisXML API is different in scope — paid whois/rdap data provider with bulk and api access. Neither is trying to fully replace the other.
Free Domain Age Checker
Looks up a single domain's real public registration date via RDAP/WHOIS, free.
Use it when: You need one domain's age, once, right now.
WhoisXML API
A paid data API for bulk WHOIS/RDAP lookups, historical WHOIS records, and programmatic access at scale.
Use it when: You need bulk lookups, historical ownership records, or API access for your own tooling.