CalcuSpec

Developer And SEO Tools

Local developer utilities for JSON, CSV, Base64, URLs, regex, schema, robots.txt, sitemaps, Open Graph, HTTP, DNS, and CSS. This collection has 131 tools across 3 pages -- press Ctrl/Cmd+K to search all of them at once.

11 of 131 tools shown on this page

HTML Entity Reference

Search common HTML entities and characters.

Developer Tools · Reference
CSS Named Color Lookup

Search useful CSS named colors and hex values.

Developer Tools · Reference
Keyboard Key Code Reference

Search common keyboard keys and browser key values.

Developer Tools · Reference
Unicode Symbol Lookup

Search common Unicode symbols for writing and UI work.

Developer Tools · Reference
Common Port Reference

Search common network port numbers and services.

Developer Tools · Reference
HTTP Method Reference

Search common HTTP request methods and uses.

Developer Tools · Reference
Markdown Syntax Reference

Search common Markdown syntax patterns for headings, links, lists, and more.

Developer Tools · Reference
Regex Token Reference

Search common regular expression tokens.

Developer Tools · Reference
Cache Hit Rate Calculator

Calculate cache hit rate from hits and misses.

Developer Tools · Calculator
Uptime Percentage Calculator

Calculate service uptime from downtime minutes in a period.

Developer Tools · Calculator
SLA Downtime Calculator

Calculate allowed downtime from an uptime SLA and period length.

Developer Tools · Calculator

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How this collection is built

This hub groups related SpecWhale pages by category, keywords, and task intent. Each result links to a canonical single-tool page with its own title, description, structured data, examples, and related-tool links.