List Tools
Curated reference libraries with actionable context. Explore formats, countries, and more with insights you can plug straight into your workflows.
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File Extensions
Search any extension and get context you can drop into handoffs: MIME types, usage tips, safety callouts, and related formats for confident sharing.
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Countries of the World
Browse every country with GTM-ready snapshots: flags, dialing codes, population data, and localisation insights you can act on immediately.
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HTML Color Codes
A programmatic library of standard CSS named colors featuring contrast ratios, print-ready CMYK values, color harmonies, and a live contrast playground.
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HTTP Status Codes
A complete SEO-focused directory of HTTP response status codes with debugging context and technical snippets.
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Paper Sizes & Dimensions
A comprehensive reference guide for standard paper sizes (A4, Letter, etc.) with exact dimensions in mm, inches, and calculated pixels.
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Open Source Licenses
A developer's cheat sheet for open-source licenses. Compare permissions, limitations, conditions, and copy SPDX standard texts instantly.
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MIME Types
A static developer directory of core MIME types with Content-Type examples, extension mappings, compression hints, and server config snippets.
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Network Ports & Protocols
A static reference for common TCP and UDP ports with service context, security notes, firewall commands, and Nmap checks.
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Common Regex Patterns
A static regex cheat sheet with practical patterns, pass/fail examples, performance warnings, and a live browser-side matcher.
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ASCII, HTML Entities & Symbols
A static directory of popular symbols with HTML entities, Unicode values, CSS escapes, keyboard shortcuts, and related characters.