IPv4 to Integer: A Field Guide to the Canonical Form of an IP Address
An IPv4 address is a 32-bit number dressed up in dotted-decimal clothing. The IPv4 to…
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HTTP Request Tester: a mini Postman that lives in your browser
What an in-browser HTTP client actually solves The shortest path to a real HTTP response…
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Superscript & Subscript Converter Field Guide: Unicode That Survives the Copy-Paste
Real Unicode glyphs beat HTML and tags when you want chemistry, math exponents, and footnote markers to survive the copy-paste into chat, code, and filenames.
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WCAG Contrast Checker Field Guide: Five Numbers That Pass an Accessibility Audit
A WCAG contrast checker is the one accessibility tool that turns subjective design debates into…
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Projectile Motion Field Guide: Five Numbers Your Calculator Already Gives You
If you can plug four numbers into a form, you already know enough to read…
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Upside-Down Text Field Guide: How the Unicode Flip Actually Works
Upside-down text is just per-letter Unicode lookalikes pasted back in reverse order, and that two-step…
GraphQL Playground Field Guide: Five Edge Cases Where the Browser Beats the CLI
Stop installing CLI clients just to test a query. A GraphQL Playground runs entirely in…
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Molar Mass Lookup Field Guide: Atomic Weights That Survive a Lab Bench Audit
Molar mass is just a number — until you ask where it came from. A…
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Remove Duplicate Lines Field Guide: The Five Edge Cases Behind Every “Just Dedup It”
The fastest way to dedupe a long list of lines is rarely a custom script.…
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Mod-11 Checksum Calculator Field Guide: ISBN-10, fodselsnummer, and the X check digit
The Mod-11 check digit is the quiet workhorse behind ISBN-10, ISBT-128 blood bags, Norwegian fødselsnummer,…