anthropic.com
16 technologies detected across 9 categories. Scanned 49 minutes ago.
What the stack tells you
Anthropic's marketing site runs on Webflow with Sanity for structured content, Cloudflare for delivery and bot management, AWS S3 for assets, and LottieFiles for the animations. jQuery is still in the page. Side by side with OpenAI's Next.js-on-Vercel build, this is a different category of artifact entirely. Webflow is a visual page builder optimized for designers and marketers shipping landing pages without a deploy pipeline, and that's exactly the workflow this stack implies.
That choice is not an accident and it's not laziness. It's a statement about where engineering effort goes at Anthropic: into the product, the API, and the model, not into the marketing surface. Webflow plus Sanity plus Cloudflare gets you a fast, well-cached, design-led site with editorial workflow, and it lets the marketing team ship without a frontend on-call rotation. The cost is that the marketing site is structurally separate from anything product-grade. You can tell from the outside which team owns it.
Cloudflare Bot Management is the one place the two AI labs converge. Both companies are scraped constantly, both run Cloudflare's bot defense, both terminate HSTS at the edge. After that, the stacks diverge sharply. The presence of jQuery alongside Svelte and React fragments is the classic Webflow fingerprint - the platform ships jQuery whether you wanted it or not, and the framework detections are mostly Webflow's own runtime and embedded widgets rather than a hand-built SPA.
The signal
Anthropic treats anthropic.com as a marketing artifact built by marketers, not a product surface built by engineers, and the stack reflects that ownership boundary cleanly.
Miscellaneous
- HTTP/3
HTTP/3 is the third major version of the Hypertext Transfer Protocol used to exchange information on the World Wide Web.
- LottieFiles
LottieFiles is an open-source animation file format that's tiny, high quality, interactive, and can be manipulated at runtime.
- Open Graph
Open Graph is a protocol that is used to integrate any web page into the social graph.
CDN
- Amazon S3
Amazon S3 or Amazon Simple Storage Service is a service offered by Amazon Web Services (AWS) that provides object storage through a web service interface.
- Cloudflare
Cloudflare is a web-infrastructure and website-security company, providing content-delivery-network services, DDoS mitigation, Internet security, and distributed domain-name-server services.
JavaScript frameworks
- React
React is an open-source JavaScript library for building user interfaces or UI components.
- Svelte
Svelte is a free and open-source front end compiler created by Rich Harris and maintained by the Svelte core team members.
JavaScript libraries
- jQueryv3.5.1
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
- Preact
Preact is a JavaScript library that describes itself as a fast 3kB alternative to React with the same ES6 API.
Security
- Cloudflare Bot Management
Cloudflare bot management solution identifies and mitigates automated traffic to protect websites from bad bots.
- HSTS
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
CMS
- Sanityfreemium · recurring · payg
Sanity is a platform for structured content. It comes with an open-source, headless CMS that can be customized with Javascript, a real-time hosted data store and an asset delivery pipeline.
PaaS
- Amazon Web Services
Amazon Web Services (AWS) is a comprehensive cloud services platform offering compute power, database storage, content delivery and other functionality.
Page builders
- Webflowfreemium · low · recurring
Webflow is Software-as-a-Service (SaaS) for website building and hosting.
UI frameworks
- SvelteKit
SvelteKit is the official Svelte framework for building web applications with a flexible filesystem-based routing.
How we detected this
We analyze the public homepage of anthropic.com against a library of common third-party tools and frameworks - SaaS vendors, analytics, CDNs, payment processors, frontend frameworks, and dev infrastructure.
Results reflect what's observable on the public homepage at scan time. Tools that load only after sign-in or specific user interactions may not appear.
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