--- title: "Scalar: vendor profile: Agent Ready HTML" description: "Scalar, a docs platform: 2 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/scalar/ site: "Agent Ready HTML" last_updated: 2026-11-05 section: "Vendors" --- # Scalar: vendor profile: Agent Ready HTML > Scalar, a docs platform: 2 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/scalar/ Site: Agent Ready HTML Last reviewed: 2026-11-05 # Scalar: vendor profile In short Scalar serves each docs page as markdown at /index.md. Its docs returned a real 404 for a made-up path on 2026-11-05, with or without a markdown Accept header. A site stays published only on a paid plan after the 7-day trial, and a custom domain points straight at Scalar. Pro is $150 a month, or $125 yearly. ## At a glance **standards.txt** scalar ```text llms-txt = supports markdown-negotiation = no statement markdown-twin = supports initial-html = partial real-404 = no statement vary-accept = no statement ``` 2 supports, 1 partial or announced, 3 no statement. **Scalar** Docs platform Scalar Docs is a hosted docs product built on the open source Scalar API Reference that serves llms.txt, llms-full.txt and /index.md copies, answers Accept: text/markdown, and needs a paid plan to keep a site published. Type [Docs platform](https://agentreadyhtml.com/vendors/by-type/docs-platform/) Home page [scalar.com](https://scalar.com/), answered HTTP 200 on 2026-11-05 Last read 5 November 2026 ## What it does for this layer - Scalar describes itself as a team of ten engineers and designers that maintains open source API tooling. \[vendor claim\] [source](https://scalar.com/company), read 5 November 2026. - Scalar Pro costs $150 a month or $125 billed yearly ($1,500 a year), and Business costs $600 a month or $500 billed yearly ($6,000 a year). \[primary source, 2026-11-05\] [source](https://scalar.com/pricing), read 5 November 2026. - Scalar gives every new team a 7-day trial with Pro limits, after which publishing a Scalar Docs site requires a paid plan. \[primary source\] [source](https://scalar.com/pricing), read 5 November 2026. - Scalar reserves subpath hosting such as example.com/docs and SSO for the Business plan, which also raises the limits to 25 APIs and 10 editor seats. \[primary source\] [source](https://scalar.com/pricing), read 5 November 2026. - Scalar requires a DNS-only CNAME for a custom docs domain, because it handles load balancing and TLS itself, so the owner's own CDN or WAF cannot sit in front. \[primary source\] [source](https://scalar.com/products/docs/configuration/domains), read 5 November 2026. - Scalar skips TXT verification for custom domains, and the first project that publishes with the domain while its CNAME points to Scalar reserves it. \[primary source\] [source](https://scalar.com/products/docs/configuration/domains), read 5 November 2026. - Scalar Docs renders every API page with the MIT-licensed Scalar API Reference, which Scalar says has 15.7k GitHub stars. \[primary source\] [source](https://scalar.com/products/docs), read 5 November 2026. - Scalar API Reference 1.71.0, released 2026-09-22, added Copy as Markdown buttons that turn the resolved OpenAPI operation or webhook into Markdown. \[primary source, 2026-09-22\] [source](https://scalar.com/products/api-references/changelog), read 5 November 2026. - Scalar API Reference 1.71.0 also loads the API Client modal and agent chat only when first opened, cutting the initial bundle by about 28 percent for read-only setups. \[primary source, 2026-09-22\] [source](https://scalar.com/products/api-references/changelog), read 5 November 2026. - Scalar Docs takes custom meta tags and scripts through siteConfig.head, and a configured script loads synchronously in the head, blocking first render unless async or defer is set. \[primary source\] [source](https://scalar.com/products/docs/configuration/site-config), read 5 November 2026. - On 2026-11-05 the markdown response for Scalar's llms-txt docs page listed Accept as its only Vary value and came from Cloudflare. \[observed, 2026-11-05\] [source](https://scalar.com/products/docs/configuration/llms-txt), read 5 November 2026. - Scalar serves the markdown copy of a page at /index.md under the page path; that URL for the llms-txt page returned HTTP 200 text/markdown on 2026-11-05. \[observed, 2026-11-05\] [source](https://scalar.com/products/docs/configuration/llms-txt), read 5 November 2026. - Scalar returned a real HTTP 404 HTML page for a made-up docs path on 2026-11-05, and asking for text/markdown did not change that status. \[observed, 2026-11-05\] [source](https://scalar.com/products/docs/configuration/redirects), read 5 November 2026. - No JSON-LD script appeared in the server HTML of Scalar's site-config docs page on 2026-11-05, and Scalar's docs describe none. \[observed, 2026-11-05\] [source](https://scalar.com/products/docs/configuration/site-config), read 5 November 2026. ## Products and plans | Product | What it is | Price | As of | Source | | --- | --- | --- | --- | --- | | Scalar Free | Hosted OpenAPI docs, built-in API client and landing pages for up to 3 APIs and 1 editor seat. | Free tier, paid plans above it; Free, $0; Docs publishing needs a paid plan after the 7-day trial | 2026-11-05 | source | | Scalar Pro | Docs, SDKs and hosted MCP servers with custom domains, Git Sync, Markdown and MDX, up to 15 APIs and 5 editor seats. | From USD 150; Pro, per month billed monthly; $125 per month billed yearly | 2026-11-05 | source | | Scalar Business | Adds SSO and subpath hosting, up to 25 APIs and 10 editor seats. | From USD 600; Business, per month billed monthly; $500 per month billed yearly | 2026-11-05 | source | | Scalar Enterprise | Full developer portals, SSO/SAML and RBAC, unlimited APIs and SLAs. | Quote on request; Custom | 2026-11-05 | source | | Scalar API Reference | MIT-licensed open source renderer for OpenAPI documents, with a separate server-side rendering package. | Free, open source; Free and open source | 2026-11-05 | source | ## Standards | Standard | Status | What the vendor's pages say | Source | | --- | --- | --- | --- | | llms-txt | supports | Documented as automatic on all published Scalar Docs sites, with no author setup. | source | | markdown-negotiation | no statement | The llms.txt, domains and site-config pages say nothing about Accept headers, yet scalar.com still sent text/markdown when curl asked for it on 2026-11-05. | none | | markdown-twin | supports | Page copies live at /index.md, the URLs that the generated index links to. | source | | initial-html | partial | Hosted Scalar Docs pages held their text in HTML on 2026-11-05, but pre-rendered HTML for the self-hosted API Reference needs the server-side rendering package. | source | | real-404 | no statement | Scalar's redirects and domains pages do not mention missing-page status, and a made-up docs path got 404 even with a markdown Accept header. | none | | vary-accept | no statement | Vary is not covered in Scalar's docs, while the markdown response on 2026-11-05 listed Accept as its sole Vary value. | none | ## Checks on its own site | Reading | Result | Date | | --- | --- | --- | | Home page request | HTTP 200; H1 in the initial HTML: yes; 1,218 words; 0 JSON-LD blocks | 2026-11-05 | | Request with Accept: text/markdown | HTTP 200, text/markdown, Vary: Accept | 2026-11-05 | | /llms.txt at the host root | HTTP 200, text/plain, 76 KB, starts with an H1 | 2026-11-05 | | A made-up path | HTTP 404 | 2026-11-05 | | Ora score, cached | 74, grade B | 2026-09-30 | | Cloudflare keyless scan | 80, L5 Agent-Native | 2026-11-05 | | Shared crawl row | outside the ranked slice; home page HTTP 200; H1 in the HTML: yes; 1,239 words; JSON-LD types: none; answers markdown: yes; made-up path HTTP 404; llms.txt valid: yes | 2026-11-04 | ## What it does not do - Scalar's single-file HTML and CDN build of the API Reference draws the reference in the browser; pre-rendered HTML comes only from the @scalar/server-side-rendering package. [source](https://scalar.com/products/api-references/server-side-rendering), read 5 November 2026. ## Related pages on this site - [Docs platforms in this section](https://agentreadyhtml.com/vendors/by-type/docs-platform/) - [Scalar: platform profile and rubric scores](https://agentreadyhtml.com/platforms/scalar/) - [The Plain Fetch viewer](https://agentreadyhtml.com/viewer/) ## Sources 1. [Scalar: home page](https://scalar.com/) https://scalar.com/, read 5 November 2026 2. [About Scalar: The API Platform for Developers & Agents](https://scalar.com/company) https://scalar.com/company, read 5 November 2026 3. [Scalar Pricing: Free & Paid Plans for API Docs & SDKs](https://scalar.com/pricing) https://scalar.com/pricing, read 5 November 2026 4. [Domains](https://scalar.com/products/docs/configuration/domains) https://scalar.com/products/docs/configuration/domains, read 5 November 2026 5. [Server-Side Rendering](https://scalar.com/products/api-references/server-side-rendering) https://scalar.com/products/api-references/server-side-rendering, read 5 November 2026 6. [API Documentation Platform for Guides & References | Scalar](https://scalar.com/products/docs) https://scalar.com/products/docs, read 5 November 2026 7. [Scalar API Reference release notes](https://scalar.com/products/api-references/changelog) https://scalar.com/products/api-references/changelog, read 5 November 2026 8. [Site Config](https://scalar.com/products/docs/configuration/site-config) https://scalar.com/products/docs/configuration/site-config, read 5 November 2026 9. [llms.txt](https://scalar.com/products/docs/configuration/llms-txt) https://scalar.com/products/docs/configuration/llms-txt, read 5 November 2026 10. [Redirects](https://scalar.com/products/docs/configuration/redirects) https://scalar.com/products/docs/configuration/redirects, 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/).