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What's this site
built with?

Paste any website. Sniff reveals its tech stack, how fast it answers, how well it's secured, and the CO₂ every visit costs.

What is github.com built with?

GitHub · Change is constant. GitHub keeps you ahead. · GitHub · GitHub — Join the world's most widely adopted, AI-powered developer platform where millions of developers, businesses, and the largest open source community build software that advances humanity.

Tech stack

Scores

Verdict

GitHub is built with React and Bootstrap for the frontend, Contentful powering content management, PWA architecture, and Open Graph metadata. Its A-grade security rating is its strongest asset, showing robust protection practices. The critical priority is cutting the 9.9 MB payload and 62 requests to lift the performance score from 56—this single change would improve load times, user experience, and the appalling F-grade carbon footprint simultaneously.

Scanned 2026-10-30.

1

Paste any website

Sniff fetches the page once, like a browser would, and weighs every file it loads.

2

See the stack

About 110 fingerprints reveal frameworks, CMSs, hosting, CDNs, analytics, payments and more.

3

Get the scores

Speed, security headers grade and CO₂ per visit, with a plain-English verdict and fixes.

Popular tech stack reports

github.comstripe.comnotion.sovercel.comairbnb.comnetflix.comspotify.comshopify.comfigma.comlinear.appopenai.comanthropic.comslack.comdiscord.comreddit.commedium.comstackoverflow.comwikipedia.orgnytimes.combbc.comcanva.comduolingo.comzerodha.comswiggy.comzomato.comflipkart.comrazorpay.comcred.clubgroww.innykaa.commyntra.commakemytrip.com

Questions

How do I find out what a website is built with?

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.

Is Sniff free?

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.

How is the carbon footprint calculated?

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.

What does the security grade mean?

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.

Can I compare two websites?

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.

What technologies can Sniff detect?

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.