frontenddogma.com
A site check tool that tests a website in more than 90 web-based tools. It gives a first impression of website quality and links to results from analysis tools. A bookmarklet can evaluate any page.
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speedvitals.com
SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
webdna.xtra.wtf
WebDNA is a website analysis tool that examines six core modules of a site. It extracts logos, favicons and brand colors, identifies frameworks, analytics and libraries, previews Open Graph data and social connections, analyzes font families, sizes and weights, checks SSL status and header security practices, and gives an overview of page weight and load metrics.