Scalar

Scalar provides tools for API documentation, SDK generation, API registries, API requests, and MCP server use. Scalar Docs combines product guides with interactive references generated from OpenAPI documents. Teams can use Markdown or MDX, draw on GitHub content, review pull request previews, and publish through a CLI or after a merge. The SDK Generator creates type-safe client libraries from OpenAPI documents and can publish them through repository pull requests. Registry stores and versions OpenAPI and AsyncAPI documents, JSON Schema, and Spectral rules with Git integration. Scalar API Client is an open-source, offline-first tool for sending requests, organizing collections, and testing APIs from OpenAPI documents. The products support hosted and self-hosted use. The Free plan costs nothing and includes up to 3 APIs, 1 SDK of up to 25 endpoints, 1 editor seat, and 50 Agent Scalar credits. Pro costs $150 a month, and Business costs $600 a month. Scalar states that it has received a SOC 2 Type 1 report and maintains GDPR-compliant privacy practices.

Scalar covers several stages of API work, from documentation to requests and SDK generation. The Free plan provides a starting allowance, while higher API and editor limits require paid plans.

Scalar suits developers and teams creating API documentation, client libraries, or API registries. Its hosted and self-hosted options may fit teams with different deployment preferences.

Overview

Scalar is an API toolkit for teams that want documentation, client SDK generation, specification management, and request testing to work together. It suits developers maintaining APIs through OpenAPI and GitHub; its breadth is a strength, though teams needing only a simple documentation site may find more product than they need.

Its documentation portal pairs interactive references with written guides, while the wider suite extends into SDKs, an API registry, an API client, and an MCP server. Scalar supports hosted and self-hosted use, and custom domains are supported.

Key features

Documentation and publishing

Scalar Docs turns OpenAPI documents into interactive API references and supports Markdown and MDX for guides. GitHub integration can read selected repository files, open pull requests, and publish after a merge; teams can also publish through a CLI. Pull request previews suit teams that want to review documentation changes alongside code, though the workflow's GitHub orientation may be less relevant to teams that do not manage content in repositories.

SDKs, registry, and requests

The SDK Generator builds idiomatic, type-safe client libraries from OpenAPI documents and can publish them through repositories using pull requests. That makes it useful when maintaining client libraries is part of the API release process. Registry manages and versions OpenAPI and AsyncAPI documents, JSON Schema, and Spectral rules with Git integration, giving API teams a central place for related assets.

The open-source, offline-first API Client sends requests, organizes collections, and tests APIs from OpenAPI documents. OpenAPI import, API versioning, interactive references, and code samples round out the core workflow. The product family also includes an MCP server, although its specific capabilities are not detailed here.

Privacy and deployment

Scalar says it has received a SOC 2 Type 1 report and maintains GDPR-compliant privacy practices. It says hosted API interfaces use technically required cookies, do not fingerprint projects on custom domains, and do not log request traffic. Teams that want to run open-source tooling in their own environment can self-host; others can use hosted options.

Pricing

The Free plan costs nothing and allows up to 3 APIs, 1 SDK of up to 25 endpoints, 1 editor seat, and 50 Agent Scalar credits. It is a useful starting point for an individual or small project, but the single seat and small API and SDK allowances make it a limited fit for collaborative or larger API programs.

Pro costs $150 a month, or $125/month billed yearly ($1,500 per year). It raises the caps to 15 APIs, 1 SDK of up to 100 endpoints, 5 editor seats, and 500 Agent Scalar credits. This is the first paid tier suited to a small team sharing editorial work; the API and SDK ceilings still matter if the portfolio grows.

Business costs $600 a month, or $500/month billed yearly ($6,000 per year). It includes up to 25 APIs, 1 SDK of up to 250 endpoints, 10 editor seats, and 2,000 Agent Scalar credits. The extra seats and capacity better fit larger teams, but the price is substantial and the tier still specifies one SDK.

Enterprise has custom pricing and unlimited APIs. It is the tier to consider when the lower API caps are insufficient; it also includes priority support, SLAs, migration services, and a dedicated Slack or Teams channel. Agent Scalar credits reset each billing period and do not roll over, so unused credits are lost at renewal. Scalar is freemium, but the free allowance is capped rather than unlimited.

Platforms

Scalar supports API, Linux, macOS, web, and Windows environments, with self-hosting also available. That range gives teams a choice between hosted access and running open-source tooling in their own environment.

Who it's for

Scalar is a strong fit for API teams that want OpenAPI-based documentation, SDK generation, specification management, and request testing under one product umbrella. GitHub-driven teams can benefit from pull request previews and merge-based publishing. Solo users can start free, while teams should compare their API count, SDK endpoint needs, and editor seats with the paid caps before committing.

It is less compelling for someone seeking only a lightweight documentation generator or a very low-cost shared documentation service: Scalar's paid entry starts at $150 a month, and its free tier has just one editor seat.

Pros and cons

• Broad API workflow: Docs, SDK generation, registry, and an API client cover distinct stages of API work in one suite.
• Repository-centered publishing: GitHub pull requests, previews, and merge publishing fit teams that review docs as part of development.
• Deployment choice: Hosted and self-hosted options suit teams with different infrastructure preferences.
• Restrictive free collaboration: One editor seat makes the free plan a poor choice for a team editing together.
• Meaningful paid cost: Pro begins at $150 a month, while Business is $600 a month.
• Credits expire: Agent Scalar credits do not roll over between billing periods.

Alternatives

Palt is worth considering for web-based API documentation on a smaller budget: its Free plan includes 3 projects, a custom domain, a Try It playground, and basic analytics, while Pro is $19 a month per project. Choose Scalar instead when SDK generation, registry management, or self-hosting matters.

PilotDocs may suit teams prioritizing guides and tutorials: its Starter plan is $49 a month for 10 projects, unlimited API endpoints, and unlimited guides and tutorials. Scalar is the broader choice for teams also needing SDK generation and an API registry.

Theneo offers a free Starter Package with public and private project allowances, team members, and GPT-powered search results. It is an alternative to compare for teams seeking a free documentation tier; Scalar's free plan instead specifies API, SDK, seat, and Agent Scalar credit caps.

TypeDoc is free and open source for generating documentation for TypeScript projects. Choose it when TypeScript project documentation is the need, rather than Scalar's broader API-focused suite.

Apiary has a free plan with unlimited API projects, five participants per project, and public projects. It may suit teams comfortable with public projects and a free collaboration model.

ApiNotes has a free Starter plan for one public API, a 10-release changelog, up to 25 subscribers, and one team member. Consider it for a focused API changelog and validator workflow; Scalar covers a wider set of documentation and API development tasks.

Endrel is another freemium option for API work.

Fern is a freemium alternative with support across API, Linux, macOS, self-hosted, web, and Windows environments.

Browse more options in API Documentation Tools, Documentation Generators, and Knowledge base software.

Verdict

Choose Scalar if your team wants OpenAPI-based docs and SDK generation alongside registry management and request testing, especially when GitHub-based publishing or self-hosting fits your workflow. Its main trade-off is cost and capacity: the free tier is narrow for collaboration, and paid plans start at $150 a month. Look elsewhere if you need only a focused documentation tool or a lower-cost shared plan.