Bump.sh vs Scalar

Bump.sh is a hosted API documentation platform built by a small, fully remote French team led by CEO Sébastien Charrier. It takes OpenAPI and AsyncAPI definitions from your repository, turns them into fast reference docs, and diffs every new version so breaking changes are flagged and a changelog is generated automatically. It is docs-as-code for teams that treat the API contract as the source of truth.

Every commit or pull request can deploy or preview docs through the CLI or GitHub Action, and API hubs group many APIs into one portal with a custom domain. Pro adds branch management, an API Explorer, release rollback and the automatic changelog. There is no free plan: Basic costs $50 per month for 10 API docs, Pro $120 per month for 30 docs with a 14-day trial, and Custom adds SSO, embed mode and a 99.99% SLA. Open source projects can request free Pro access.

Bump.sh suits platform teams publishing many internal or public APIs, especially event-driven ones, since AsyncAPI support is first class. It is weaker for long guides and marketing-style portals. ReadMe and Mintlify are stronger for narrative docs, Redocly offers similar OpenAPI tooling with more linting and self-hosting, and Stoplight focuses on design-first editing.

The biggest recent change is its new managed MCP platform: Bump.sh generates and hosts MCP servers from API definitions and Arazzo workflow files, with auth and observability, so AI agents can call your API safely. Note that Basic includes only five MCP tools.

Scalar is an open-source platform for API documentation and testing built around the OpenAPI standard. Its best-known product is the Scalar API Reference, a modern, interactive reference page generated from an OpenAPI or Swagger file, with a built-in API client so readers can send real requests from the docs instead of copying curl commands.

The reference can be dropped into a project with a script tag or through integrations for frameworks such as ASP.NET Core, FastAPI, Express, NestJS, Hono and Laravel, which is why it is often used as a modern replacement for Swagger UI. Microsoft's ASP.NET Core documentation lists Scalar as one way to display OpenAPI documents after Swashbuckle was removed from the default template in .NET 9. The Scalar API Client is also available as a standalone app for testing endpoints, similar to Postman. On top of the open-source tools, Scalar offers a hosted platform for publishing API references and guides with custom domains, themes and team features on a paid plan.

Scalar fits developers and startups that want polished API references with minimal setup and no licence cost. It is younger than established players, enterprise developer portal features such as analytics, access control and monetisation are still developing, and the community is smaller. Swagger UI and Redoc are the classic free renderers, Mintlify and ReadMe are full hosted documentation platforms, and Postman is the dominant API client.