Side-by-side comparison of AI visibility scores, market position, and capabilities
Automatic multi-language SDK and API documentation generator from OpenAPI specs; $13M Bessemer-led Series A from YC W23 serving Cohere and ElevenLabs competing with Stainless for API developer experience.
Fern is a New York-based API tooling company that automatically generates multi-language SDKs and API documentation from OpenAPI specifications — enabling API companies to publish high-quality client libraries in TypeScript, Python, Java, Go, Ruby, and C# from a single source of truth, eliminating the significant engineering effort of manually building and maintaining SDKs for each programming language a developer audience uses. Founded in 2022 by Danny Sheridan and Deep Singhvi and a Y Combinator Winter 2023 graduate, Fern raised $13 million total including a $9 million Series A led by Bessemer Venture Partners with 30 employees.
Open-source browser-based API testing platform with 500K+ developers; $3M seed from OSS Capital competing with Postman as a lightweight, self-hostable alternative for REST and GraphQL testing.
Hoppscotch is an open-source API development and testing platform — providing a web-based, lightweight alternative to Postman and Insomnia for building, testing, and documenting REST, GraphQL, WebSocket, and gRPC APIs. Founded in 2019 by Liyas Thomas and Andrew Bastin in Kochi, India, Hoppscotch has grown to 500,000+ developers globally using the platform, raised $3 million in seed funding led by OSS Capital with participation from Automattic (WordPress.com parent), and offers a free open-source version alongside Hoppscotch Pro cloud with team collaboration and private workspaces.
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