Free and open first
Best API Generation Software in 2026
- 25 apps
- Research read 28 Sept 2026
- How the order is worked out
- 1
Fern
Free plan Open source APILinuxMac+3Fern combines API documentation publishing with client library generation and offers a defined Free plan.
- 2
Swagger Codegen
Free plan Open source APILinuxMac+3Swagger Codegen can turn API specifications into client libraries, server stubs, and documentation, with both GitHub and SwaggerHub availability. Review untrusted definitions before generating code.
- 3
DreamFactory
Free plan APILinuxSelf-hostedDreamFactory combines API generation, access controls, auditing, scripting, and AI gateway features in a self-hosted platform.
- 4
Hasura
Free plan APILinuxSelf-hosted+1Hasura offers multiple API types, database connections, and deployment paths.
- 5
Directus
Free plan Web - 6
OpenAPI Generator
Free plan LinuxMacSelf-hosted+2OpenAPI Generator covers client, server-stub, and documentation generation, with options to customize output and integrate with common build workflows.
- 7
PocketBase
Free plan AndroidAPIiPhone+5 - 8
Speakeasy
Free plan APILinuxMac+2Speakeasy brings MCP governance, workflow assistants, and API tooling into one platform. Teams evaluating the Enterprise plan will need to request pricing.
- 9
oapi-codegen
Free plan LinuxSelf-hostedoapi-codegen covers several Go server backends and client generation, with customization for generated output. Its OpenAPI 2.0 exclusion and version requirements are key limits to check.
- 10
PostGraphile
Free plan APISelf-hostedWebPostGraphile offers an open-source route to PostgreSQL-backed GraphQL APIs, with Pro protections and replica scaling for V4 Core.
- 11
Supabase
Free plan AndroidAPIiPhone+4Supabase brings a Postgres database and several backend services together, with client libraries and self-hosting documentation.
- 12
Parse Platform
Free plan AndroidAPIiPhone+3Parse Platform offers a broad, deployable backend with APIs, Cloud Code, authentication, real-time features, and multiple storage choices.
- 13
Stainless
Free plan LinuxMacWebStainless brings SDK generation, API documentation, and code-mode MCP servers together around OpenAPI.
- 14
TypeSpec
Free plan ExtensionLinuxMac+2TypeSpec combines API modeling with generation of several common schema and specification formats.
- 15
Xano
Free plan AndroidAPIiPhone+2 - 16
Microsoft Data API Builder
Free plan LinuxMacWindows - 17
FastAPI Code Generator
Free plan - 18
GraphQL Code Generator
Free plan - 19
gRPC-Gateway
Free plan - 20
Hey API
Free plan - 21
ogen
Free plan - 22
tsoa
Free plan - 23
Microsoft Kiota
Paid LinuxMacWindows - 24
liblab
Paid Web - 25
GraphQL Mesh
Paid
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price