🛠️Developer Tools · Domain & DNSFree
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Check Domain
Free domain tools in one place — value estimate, availability across 10+ TLDs, health checks and WHOIS, no sign-up
Website: https://check-domain.com/ · License: Proprietary · Type: Free web tool suite
Why it exists
Domain research is scattered across registrar upsell pages, sketchy "appraisal" sites that want your email, and WHOIS lookups buried behind captchas. Check Domain consolidates the four things people actually ask about a domain — value, availability, health, ownership — into one clean page with no account, no premium tier and no stored queries. The clever bit is architecture: lookups happen in your browser via public APIs (RDAP, Google DNS), so there's no server-side logging of what you searched for, and results appear in under a second.
Main features
- Value estimator — instant appraisal based on length, keywords, TLD and brandability signals.
- Availability checker — real-time check across 10+ popular extensions at once.
- Health checker — DNS resolution, SSL certificate status, response time and server up/down for any live domain.
- WHOIS/RDAP lookup — registration details, nameservers, expiry dates and registrar info.
- Privacy-first posture — queries are not stored or tracked; no sign-up, no usage limits, always free.
Who it's for
- Founders and side-project builders hunting for a name before they commit.
- Domain investors doing quick first-pass valuations without handing queries to a broker.
- Webmasters and ops folks running a fast health check on a live site.
How it compares
- Registrar search bars — availability only, and designed to upsell you; no value or health context.
- GoDaddy Domain Appraisals — similar estimates but behind the registrar's funnel and login.
- who.is / ICANN lookup — solid WHOIS data, one query at a time; Check Domain bundles it with health and availability in one view.
- dig / curl RDAP — the terminal-native equivalent, if you have the muscle memory.
Notes
- Client-side means result quality tracks the public RDAP/DNS APIs it uses — enough for research, not a legal ownership report.
- The value estimator is a heuristic appraisal, not a market price; treat six-figure estimates accordingly.
- WHOIS privacy protection (the norm these days) naturally limits what ownership details are visible.