blaircox.com
Working tools, calculators, and experiments from a web developer's bench. Free to use, no signups, no tracking.
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Website health check
Enter your address, get a plain-language report on speed, security, and what needs attention.
DiagnosticsDomain and certificate checker
Who controls your domain, when it expires, and whether your padlock is about to fail.
DiagnosticsEmail deliverability checker
Find out if the internet trusts mail from your domain, and why messages go to spam.
DiagnosticsWhat is this site built with
Platform, plugins, languages, and the things that matter if you ever want to move.
Diagnostics
Diagnostics
Website health check
Enter your address, get a plain-language report on speed, security, and what needs attention.
DiagnosticsDomain and certificate checker
Who controls your domain, when it expires, and whether your padlock is about to fail.
DiagnosticsEmail deliverability checker
Find out if the internet trusts mail from your domain, and why messages go to spam.
DiagnosticsWhat is this site built with
Platform, plugins, languages, and the things that matter if you ever want to move.
DiagnosticsAccessibility quick check
The five accessibility problems most likely costing you customers, in plain words.
DiagnosticsComing soon
Tools
How do you look on Google
A two-minute self-check of your Google presence, with a grade and fixes.
ToolsImage prep
Drop in a huge photo, get web-ready sizes. Nothing leaves your browser.
ToolsWeb presence record sheet
One printable page holding everything about your website that you should not have to remember.
ToolsFluidType
Convert Figma font sizes into CSS clamp values with live preview.
ToolsGrammar test review
Adaptive grammar quiz that focuses on weak spots.
Tools