--- title: "Gatsby: vendor profile: Agent Ready HTML" description: "Gatsby, a framework: 1 of 6 standards stated as supported, 14 sourced facts, dated plans and what it does not do. Read 2026-11-05." canonical: https://agentreadyhtml.com/vendors/gatsby/ site: "Agent Ready HTML" last_updated: 2026-11-05 section: "Vendors" --- # Gatsby: vendor profile: Agent Ready HTML > Gatsby, a framework: 1 of 6 standards stated as supported, 14 sourced facts, dated plans and what it does not do. Read 2026-11-05. Source: https://agentreadyhtml.com/vendors/gatsby/ Site: Agent Ready HTML Last reviewed: 2026-11-05 # Gatsby: vendor profile In short Gatsby prerenders every page by default and builds a 404.html but leaves the HTTP status to the host. Netlify has owned Gatsby Inc. since 2023-02-01, yet the gatsbyjs.com footer still reads Gatsby, Inc. The latest release, 5.16.1, is dated 2026-02-10. gatsbyjs.com returned 404 for /llms.txt. ## At a glance **standards.txt** gatsby ```text llms-txt = partial markdown-negotiation = no statement markdown-twin = no statement initial-html = supports real-404 = partial vary-accept = no statement ``` 1 supports, 2 partial or announced, 3 no statement. **Gatsby** Framework Gatsby is a React framework that prerenders every page to static HTML at build time by default (SSG), with deferred generation and SSR per page. It builds a 404.html, while llms.txt and sitemaps come from plugins. Type [Framework](https://agentreadyhtml.com/vendors/by-type/framework/) Operator, as the facts below state it Netlify; the gatsbyjs.com footer still reads Gatsby, Inc. Home page [www.gatsbyjs.com](https://www.gatsbyjs.com/), answered HTTP 200 on 2026-11-05 Last read 5 November 2026 ## What it does for this layer - Gatsby's rendering options guide names static site generation as the default, so every page is prerendered to HTML, CSS and JavaScript at build time. \[primary source\] [source](https://www.gatsbyjs.com/docs/conceptual/rendering-options/), read 5 November 2026. - Since Gatsby 4, pages can opt into Deferred Static Generation or SSR per page; DSG needs the build server kept running with gatsby serve. \[primary source\] [source](https://www.gatsbyjs.com/docs/conceptual/rendering-options/), read 5 November 2026. - Gatsby builds the page at src/pages/404.js into a 404.html file, the name many static hosts use for their not-found page. \[primary source\] [source](https://www.gatsbyjs.com/docs/how-to/adding-common-features/add-404-page/), read 5 November 2026. - Gatsby's 404 guide leaves the status code to the host, and sites served another way need a custom rule to serve 404.html for missing paths. \[primary source\] [source](https://www.gatsbyjs.com/docs/how-to/adding-common-features/add-404-page/), read 5 November 2026. - Gatsby's built-in Head export sets page titles and meta tags; support arrived in gatsby@4.19.0, and the docs allow JSON-LD script blocks inside it. \[primary source\] [source](https://www.gatsbyjs.com/docs/reference/built-in-components/gatsby-head/), read 5 November 2026. - The official gatsby-plugin-sitemap writes sitemap-index.xml for all pages, but only in production builds. \[primary source\] [source](https://www.gatsbyjs.com/plugins/gatsby-plugin-sitemap/), read 5 November 2026. - The Gatsby plugin library lists gatsby-plugin-llms-txt, marked as a Community Plugin, which writes an llms.txt from CMS or other source data at build time. \[primary source\] [source](https://www.gatsbyjs.com/plugins/gatsby-plugin-llms-txt/), read 5 November 2026. - Gatsby 5.16.0 (January 2026) added React 19 and Node.js 24 support as a non-breaking release, per the Gatsby release notes. \[primary source, 2026-01-26\] [source](https://www.gatsbyjs.com/docs/reference/release-notes/v5.16/), read 5 November 2026. - On 2026-11-05 \`npm view gatsby\` reported 5.16.1, published 10 February 2026, as the latest Gatsby release. \[observed, 2026-02-10\] [source](https://www.gatsbyjs.com/docs/reference/release-notes/v5.16/), read 5 November 2026. - Gatsby's version support page lists v5 as the Active Long-term support line since November 8, 2022, and v4 as maintenance until Q4 2023. \[primary source\] [source](https://www.gatsbyjs.com/docs/reference/release-notes/gatsby-version-support/), read 5 November 2026. - Netlify announced on February 1, 2023 that it had acquired Gatsby Inc., the company behind the open source Gatsby framework. \[primary source, 2023-02-01\] [source](https://www.netlify.com/press/netlify-acquires-gatsby-inc-to-accelerate-adoption-of-composable-web-architectures/), read 5 November 2026. - gatsbyjs.com carries a site-wide banner moving Gatsby Cloud customers to Netlify, while its footer still reads "© 2026 Gatsby, Inc.". \[primary source\] [source](https://www.gatsbyjs.com/), read 5 November 2026. - On 2026-11-05 gatsbyjs.com returned 404 for /llms.txt, answered Accept: text/markdown on the home page with text/html, and returned a real 404 for a made-up path. \[observed, 2026-11-05\] [source](https://www.gatsbyjs.com/), read 5 November 2026. - The gatsbyjs/gatsby repository on GitHub is published under the MIT license. \[primary source\] [source](https://github.com/gatsbyjs/gatsby), read 5 November 2026. ## Products and plans | Product | What it is | Price | As of | Source | | --- | --- | --- | --- | --- | | Gatsby | Open source React framework that prerenders sites to static HTML, with optional deferred static generation and SSR. | Free, open source; MIT license | 2026-11-05 | source | ## Standards | Standard | Status | What the vendor's pages say | Source | | --- | --- | --- | --- | | llms-txt | partial | Only through gatsby-plugin-llms-txt, which the Gatsby plugin library marks as a Community Plugin; no official plugin found. | source | | markdown-negotiation | no statement | No statement found in the rendering options, Head API, 404 or release notes pages; gatsbyjs.com answered Accept: text/markdown with HTML. | none | | markdown-twin | no statement | No statement found in the Gatsby docs or official plugin pages read about .md copies of pages. | none | | initial-html | supports | The rendering options guide calls SSG the default, with the entire site pre-rendered into HTML at build time. | source | | real-404 | partial | Gatsby builds 404.html, but the 404 guide says hosts outside the default convention need a custom rule to serve it for 404 errors. | source | | vary-accept | no statement | No statement found in the Gatsby rendering options, 404, Head API or gatsby-plugin-sitemap pages about a Vary header. | none | ## Checks on its own site | Reading | Result | Date | | --- | --- | --- | | Home page request | HTTP 200; H1 in the initial HTML: yes; 129 words; 0 JSON-LD blocks | 2026-11-05 | | Request with Accept: text/markdown | HTTP 200, text/html, Vary: Accept-Encoding | 2026-11-05 | | /llms.txt at the host root | HTTP 404, text/html, 38 KB | 2026-11-05 | | A made-up path | HTTP 404 | 2026-11-05 | | Ora score, cached | 34, grade D | 2026-09-04 | | Cloudflare keyless scan | 20, L1 Basic Web Presence | 2026-11-05 | ## What it does not do - Gatsby ships no sitemap until gatsby-plugin-sitemap is added, and that plugin produces nothing in gatsby develop. ## Related pages on this site - [Frameworks in this section](https://agentreadyhtml.com/vendors/by-type/framework/) - [The Plain Fetch viewer](https://agentreadyhtml.com/viewer/) ## Sources 1. [Gatsby home page](https://www.gatsbyjs.com/) https://www.gatsbyjs.com/, read 5 November 2026 2. [Rendering Options | Gatsby](https://www.gatsbyjs.com/docs/conceptual/rendering-options/) https://www.gatsbyjs.com/docs/conceptual/rendering-options/, read 5 November 2026 3. [Adding a 404 Page | Gatsby](https://www.gatsbyjs.com/docs/how-to/adding-common-features/add-404-page/) https://www.gatsbyjs.com/docs/how-to/adding-common-features/add-404-page/, read 5 November 2026 4. [Gatsby Head API | Gatsby](https://www.gatsbyjs.com/docs/reference/built-in-components/gatsby-head/) https://www.gatsbyjs.com/docs/reference/built-in-components/gatsby-head/, read 5 November 2026 5. [gatsby-plugin-sitemap | Gatsby](https://www.gatsbyjs.com/plugins/gatsby-plugin-sitemap/) https://www.gatsbyjs.com/plugins/gatsby-plugin-sitemap/, read 5 November 2026 6. [gatsby-plugin-llms-txt | Gatsby](https://www.gatsbyjs.com/plugins/gatsby-plugin-llms-txt/) https://www.gatsbyjs.com/plugins/gatsby-plugin-llms-txt/, read 5 November 2026 7. [v5.16 Release Notes | Gatsby](https://www.gatsbyjs.com/docs/reference/release-notes/v5.16/) https://www.gatsbyjs.com/docs/reference/release-notes/v5.16/, read 5 November 2026 8. [Gatsby Framework Version Support | Gatsby](https://www.gatsbyjs.com/docs/reference/release-notes/gatsby-version-support/) https://www.gatsbyjs.com/docs/reference/release-notes/gatsby-version-support/, read 5 November 2026 9. [Netlify Acquires Gatsby Inc. to Accelerate Adoption of Composable Web Architectures](https://www.netlify.com/press/netlify-acquires-gatsby-inc-to-accelerate-adoption-of-composable-web-architectures/) https://www.netlify.com/press/netlify-acquires-gatsby-inc-to-accelerate-adoption-of-composable-web-architectures/, read 5 November 2026 10. [GitHub - gatsbyjs/gatsby: React-based framework with performance, scalability, and security built in. · GitHub](https://github.com/gatsbyjs/gatsby) https://github.com/gatsbyjs/gatsby, read 5 November 2026 Last reviewed 5 November 2026 Edition Crawl 2026-11-04 Page updated 2026-11-05 Method How the viewer reads a page, how a file is graded and how a platform is scored: [the method page](https://agentreadyhtml.com/method/).