Fusio vs Stoplight Elements

Fusio is an open-source API management platform for connecting business logic and infrastructure to APIs. It is self-hosted and brings databases, microservices, and custom scripts behind a unified gateway that handles routing, authentication, and request validation. TypeSchema models add validation and generate OpenAPI specifications and client SDKs in multiple languages. A developer portal provides documentation, testing tools, and API keys; API monetization features can manage plans, quotas, subscriptions, and billing. AI-assisted development and AI/MCP integration are described as optional. Official adapters cover services and technologies such as AWS, Google Cloud, GraphQL, LDAP, MongoDB, Redis, SQL, Stripe, and SOAP. Worker runtimes are available for PHP, JavaScript, and Python, with SDKs listed for C#, Go, Java, JavaScript, PHP, and Python. Fusio also documents lifecycle management, access policies, and API analytics. Install options include a release archive, Composer, or Docker. The code is licensed under Apache 2.0. Fusio is available for free.

Stoplight Elements is a free, open-source set of embeddable web components for building interactive API documentation from OpenAPI documents. It adds customizable left navigation and a three-column layout, while an embedded console lets readers try requests and inspect responses within the documentation. Elements supports OpenAPI, including version 3.1, and JSON Schema. It provides code samples in Curl, Python, Ruby, and Java, and its Stoplight-flavored Markdown supports tabs, callouts, and embedded JSON examples. The components require no build steps and can be used with any framework or HTML project. Documentation can be hosted anywhere, including S3 or GitHub. Elements can point to an OpenAPI document or a Stoplight Workspace and can work with any OpenAPI editor. The listed plan costs nothing and includes OpenAPI 3.1 support, an interactive API console, embedding into an existing CMS, and hosting anywhere. Compared with Elements DevPortal, the product page does not list multiple API listings, mocking, Markdown articles, branch version selection, or search. Stoplight identifies SmartBear as its parent company.