Paste any website. Sniff reveals its tech stack, how fast it answers, how well it's secured, and the CO₂ every visit costs.
Sniff fetches the page once, like a browser would, and weighs every file it loads.
About 110 fingerprints reveal frameworks, CMSs, hosting, CDNs, analytics, payments and more.
Speed, security headers grade and CO₂ per visit, with a plain-English verdict and fixes.
Paste the address into Sniff. It fetches the page once and looks for the fingerprints that frameworks, CMSs, hosting providers, CDNs and analytics tools leave in the HTML, response headers, loaded files and cookies, then lists everything it recognises.
Yes. Sniff is free, needs no sign-up and stores nothing about you. Reports for popular sites are cached for a week so they load instantly.
Sniff weighs every file the page loads and applies the Sustainable Web Design model: about 0.81 kWh per gigabyte transferred at the global average grid intensity of 494 g CO2e per kWh, then grades the result from A+ to F.
It checks six HTTP security headers (HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and Permissions-Policy), whether the site uses HTTPS with a valid certificate, and whether it reveals server versions.
Yes. Choose Compare two, enter both addresses and Sniff shows them head to head on speed, security, carbon, page weight and tech stack, with a winner.
About 110, including Next.js, React, Vue, Angular, Svelte, WordPress, Shopify, Webflow, Wix, Tailwind, Bootstrap, Cloudflare, Vercel, Netlify, AWS, Google Analytics, Stripe, Razorpay, Intercom and many more.