Fern Docs builds interactive documentation websites from Markdown and API specifications, while Fern also generates strongly typed client libraries.
Alternatives to FastAPI Code Generator
Supabase is a backend platform built around a Postgres database, with services for authentication, file storage, realtime data, and server-side functions.
Swagger Codegen generates API client libraries, server stubs and documentation from OpenAPI or Swagger definitions.
- 4

Xano
Free planAndroidiOSWebAPI7.5From $85 a month - 5

Hasura
Hasura GraphQL Engine creates a data API over connected databases, so developers can expose data without writing handlers, schemas, or resolvers.
Free planWebAPILinuxSelf-hosted6.9Free plan - 6

PocketBase
Free planAndroidiOSWebAPI6.9Free plan - 7

TypeSpec
TypeSpec is a language for defining APIs and data models, then producing schemas, API specifications, code, and documentation.
Free planWebExtensionLinuxmacOS6.9Free plan - 8
PostGraphile
PostGraphile creates GraphQL APIs backed mainly by PostgreSQL, for uses such as SaaS backends and internal business tools.
Free planWebAPISelf-hosted6.7From $25 a month - 9
6.6From $499 a month - 10
DreamFactory
DreamFactory is a self-hosted data gateway and enterprise access platform that provides governed API access to data sources.
Free planAPILinuxSelf-hosted6.6From $1,500 a month - 11

OpenAPI Generator
OpenAPI Generator creates API clients, server stubs, and documentation from OpenAPI 2.0 and 3.x documents.
Free planWebLinuxmacOSSelf-hosted6.5Free plan - 12

Parse Platform
Parse Platform is an open-source backend for mobile and web applications that can run on infrastructure supporting Node.js, including your own infrastructure.
AndroidiOSWebAPI6.5 - 13

Stainless
Stainless generates SDKs, documentation, and MCP servers from OpenAPI specifications.
Free planWebLinuxmacOS6.4Free plan - 14

Speakeasy
Speakeasy is an AI control plane for connecting, securing, and observing agents and MCP servers from one entry point.
WebAPILinuxmacOS5.9 - 15
oapi-codegen
oapi-codegen is a free, open-source command-line tool and Go library that converts OpenAPI specifications into Go server implementations, API clients, and HTTP models.
Free planLinuxSelf-hosted5.8Free plan - 16
Microsoft Kiota
LinuxmacOSWindows4.8 - 17
Microsoft Data API Builder
LinuxmacOSWindows4.7 - 18
liblab
Web4.6 - 194.5
- 204.4
- 214.3
- 224.3
- 234.3
- 244.3
