Best API Development Tools in 2026 · page 2

Stoplight Elements

WireMock

WireMock simulates APIs and software dependencies, letting teams test without relying on those services, explore edge cases, and develop dependent features in parallel.

Hurl

Hurl is a free command-line tool for running HTTP requests written in a plain-text format.

Swagger Editor

Swagger Editor is an open-source tool for creating and documenting API definitions.

Speakeasy

Speakeasy is an AI control plane for connecting, securing, and observing agents and MCP servers from one entry point.

Step CI

Step CI is a self-hosted, open-source framework for API security, performance, and load testing.

Restlet Framework