SiteCheckTools vs 51Degrees

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

SiteCheckTools compared with 51Degrees
Detail	SiteCheckTools	51Degrees
What it does	Free technical tools for website diagnostics	Device and IP intelligence APIs for developers
Stage	Not given	Established
Founded	Not given	2010
Based in	Not given	GB
Pricing model	Free	Freemium
Pricing	Not given	Free plan: 10,000 monthly requests (cloud and on-premise); Essentials: €49 per month for 100,000 requests (cloud); Pro: €360 per month for 1,000,000 requests (cloud); Pro Plus: €680 per month for 5,000,000 requests (cloud); Bespoke: unlimited requests, custom terms (cloud and on-premise)
Key features	DNS record queries across four public resolvers SSL certificate chain validation with expiry dates WHOIS and RDAP domain lookups IP WHOIS lookups for network information Core Web Vitals and speed testing Uptime and reachability checks from multiple regions Redirect chain tracing Raw data transcripts for verification WordPress theme and plugin detection Domain name generator with availability checking	Device Detection - identify device model, OS, browser, and hardware IP Intelligence - location, network, carrier, and VPN detection Bot detection and Human Confidence scoring Geolocation and reverse geocoding powered by OpenStreetMap Pipeline API for custom data services 51Did Inspector tool to inspect identifiers Prebid.js RTD module integration Cloud and on-premise deployment options Support for multiple programming languages User-Agent Client Hints support
What makes it different	Every result shows raw data and working so users can verify findings themselves No signup, no email gates, no trials required Measurements are real live lookups, never estimates or guesses Affiliate commissions only on findings, never on page loads or passing results Dense, specific documentation written for developers and technical users	Fifteen years of expertise in device detection with proprietary data Open source approach with published API source code Flexible deployment with both cloud and on-premise options Extensible Pipeline API for aggregating micro services Freemium model with free tier offering 10,000 monthly requests
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	64 no change since last check
Trust Flow (Majestic)	5	17
Citation Flow (Majestic)	7	43
Referring domains (Majestic)	3	398

4 details filled in for both companies.

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