Free, open-source tools for developers and creators.
Discover the technologies, frameworks, and tools behind any website. Scans headers, HTML, scripts, and styles.
Preview how your links appear on Facebook, Twitter/X, LinkedIn, Discord & Bluesky. Inspect Open Graph & meta tags.
Privacy-first web analytics. Track pageviews, visitors, referrers, and more — without cookies or invasive tracking.
Scan any site for security headers, SSL/TLS, performance, and DNS health. Get an instant grade with actionable fixes.
Validate, format, minify, flatten & convert JSON, YAML and TOML. Real-time error detection with line numbers.
Analyze pages for 40+ SEO factors, research keywords via Google Autocomplete, and audit entire sites for issues.
Test regular expressions with real-time matching, capture groups, and replace preview.
Encode and decode Base64 and URL text. Supports file upload, URL-safe mode, and data URL preview.
Convert between HEX, RGB, and HSL. Check WCAG contrast and generate palettes.