SecurityTrails
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Based on our record, SecurityTrails seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I'm having the same issue. https://securitytrails.com/ also had my "secret" staging subdomain. I made a catch-all certificate, so the subdomain didn't show up in CT logs. It's still a secret to me how my subdomain ended up in their database. - Source: Hacker News / over 1 year ago
DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.
WebPagetest - Run a free website speed test from multiple locations around the globe using real browsers...
WhoisXML API - Domain, IP, and DNS data provider
GTmetrix - GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.
openSquat - The openSquat is a service for detecting domain look-alikes by searching for newly registered domains that might be impersonating legit domains and brands.
Google Lighthouse - Lighthouse is an open-source, automated tool for improving the quality of web pages.