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check-host.net
Check-Host.net is an online tool for checking the availability of websites, servers, hosts and IP addresses. It offers domain and IP location data from geolocation databases and whois, ping to measure latency and packet loss from servers worldwide, HTTP response checks, DNS record retrieval, TCP and UDP port checks, a subnet calculator, a live server terminal for diagnostics, and API documentation for building monitoring solutions.
webaim.org
A WebAIM tool for checking foreground and background color contrast in RGB hexadecimal format or with a color picker. It reports a contrast ratio and WCAG AA and AAA pass/fail states for normal text, large text, graphical objects and user interface components. It also functions as a basic API when &api is appended to a permalink.
specification.website
A platform-agnostic specification of the technical features a good website should have, built in the open under an MIT licence. It covers 177 topics across ten areas, including foundations, SEO, accessibility, security, performance and privacy, and offers a yes/no checklist for auditing a site. An open, read-only MCP server lets agents query the specification.
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.
cachedpages.com
Tool for checking cached versions of web pages from search engines and archive sources.
open-ui.org
Open UI is a W3C Community Group that aims to let web developers style and extend built-in web UI components and controls such as dropdowns, checkboxes, radio buttons, and date or color pickers. The group plans to specify component parts, states, behaviors, accessibility requirements and test suites, and to implement polyfills for extensible controls.
biomejs.dev
Biome is a web toolchain that formats and lints code, with the formatter covering JavaScript, TypeScript, JSX, TSX, JSON, HTML, CSS, SCSS, GraphQL, YAML and Markdown at 97% compatibility with Prettier, and the linter offering 607 rules from ESLint, TypeScript ESLint and other sources. A single check command runs formatter, linter and assist actions.
caniuse.com
Can I use provides browser support tables for front-end web technologies on desktop and mobile browsers. The site lists features, allows users to vote for or submit missing features, and includes third-party tools for embedding tables and checking CSS features.
colourcontrast.cc
Colour Contrast Checker is a web tool that checks the contrast between different colour combinations against WCAG standards. It displays pass results for normal and large text and provides background and foreground colour values with copy options.
directorylister.com
Directory Lister is a PHP web directory lister. Its documentation covers changes, features, file search and file hashes. The release notes mention fixes to compressed ZIP downloads, configuration examples and hidden file handling, plus security fixes for path checks and direct-linked content.
whois.domaintools.com
Domain Tools is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
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.
gtmetrix.com
GTmetrix checks page speed, performance, technical issues, and web quality signals.
realtimecolors.com
Realtime Colors is a web tool for visualizing color palettes and fonts on a real website. It stores the selected colors, includes a contrast checker, and allows exporting in formats such as .zip, .png, CSS and SCSS. The source also lists a Figma plugin and VS Code.
wave.webaim.org
WAVE is a suite of evaluation tools that helps authors make web content more accessible. It can identify many accessibility and WCAG errors while facilitating human evaluation. WAVE is available as an online tool and as Chrome, Firefox, and Edge browser extensions for checking password-protected, locally stored, or highly dynamic pages. A subscription API and testing engine are also offered.