Charles Proxy alternatives

Scalar provides a modern toolkit for API documentation, request testing, and developer-facing API experiences built around OpenAPI.

Browserbase provides a reliable, managed browser infrastructure for AI agents, enabling web scraping, automated testing, and agent-based web interactions at scale.

StatusCake provides uptime monitoring, page speed testing, SSL monitoring, and hosted status pages for websites and APIs.

Postman is an API platform for designing, testing, documenting, and monitoring APIs with collaboration features for developer teams.

Open source contract testing framework ensuring microservices communicate correctly by verifying API interactions between consumers and providers.

Playwright is an open-source end-to-end testing framework by Microsoft for testing web applications across Chromium, Firefox, and WebKit with a single API.

CircleCI is a continuous integration and delivery platform that automates build, test, and deployment pipelines. It supports cloud and self-hosted environments with powerful parallelism and…

Hoppscotch is an open-source API development platform providing a fast, lightweight alternative to Postman for testing REST, GraphQL, WebSocket, and MQTT APIs.

Mailjet by Sinch is an email delivery and marketing platform with collaborative editing, API sending, and real-time analytics for teams.

Checkly is a monitoring-as-code platform for API monitoring and end-to-end testing that integrates with CI/CD pipelines to detect issues before they affect users.

API mocking library for JavaScript that intercepts network requests using Service Workers for browser and Node.js testing.

GUI client for gRPC, REST, and WebSocket APIs with scripting support and environment management.

Open source tool for debugging, testing, and building with HTTP and HTTPS traffic interception.

Human-friendly command-line HTTP client for API testing providing intuitive syntax and JSON support.

Open source API testing framework combining test automation with API mocks and performance.

Open source interactive HTTPS proxy for intercepting, inspecting, modifying, and replaying web traffic for debugging.

Lightweight framework for building mock HTTP servers in Java for integration testing of APIs.

Desktop application for creating mock REST APIs with templating, response rules, and proxy mode for local development.

Command-line tool for running HTTP requests defined in plain text with assertions for testing APIs.

Simple mock HTTP server by Kong for testing and debugging HTTP calls from your apps.

Open source Kubernetes-native tool for mocking and testing APIs and microservices from OpenAPI and AsyncAPI specs.

Chinese-founded API design, debugging, and testing platform used globally.

Java library for testing and validating REST services with a domain-specific language for writing readable API tests.

Open source API client that stores collections directly in your filesystem using a plain text markup language.