SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
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Responsivize is an open-source, cross-platform desktop app for developing responsive websites. It lets users test web apps on popular devices or custom dimensions and includes device frames, browser menubars and search bars. The app works on Windows, MacOS and Linux and is free to use.
Zola is a static site engine distributed as a single executable. It includes Sass compilation, syntax highlighting and table of contents generation without requiring a dev environment or JavaScript libraries. It renders the whole site as static files and supports templated Markdown content with internal links.
Lowdefy is a developer resource for coding, documentation, communities, security research, or software tools.
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.
SVG.wtf is a developer resource for coding, documentation, communities, security research, or software tools.
Tooplate offers a collection of free HTML and CSS website templates for startups, SaaS products and small businesses. The templates are described as mobile-friendly, responsive and built with modern CSS frameworks including Bootstrap. Templates can be customized in any HTML code editor.
