Echolon

Echolon is an open-source API client that offers Git integration, offline support, and multi-protocol capabilities. It serves as a powerful, local-first alternative to Postman for modern developers.

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At a glance

Pricing

Freemium · Open Source

Free tier

Yes

API

Skill level

Technical

About

What is Echolon?

Echolon is a powerful, local-first API client designed for modern developers, offering a robust open-source alternative to tools like Postman. It boasts deep Git integration, allowing all workspaces, collections, variables, and settings to be stored locally as plain text files, enabling seamless version control and team collaboration through standard Git workflows. The tool supports multiple protocols including REST/HTTP and WebSocket, with GraphQL support on the roadmap. Echolon is built with an offline-first architecture, ensuring all data is stored on your machine without mandatory cloud sync or account requirements, prioritizing user privacy and data security. Key features include an advanced request editor, dynamic variable system, one-click API publishing, and powerful API mocking capabilities for both local and cloud environments.

Best used for

Ideal for developers who need to test and manage REST and WebSocket APIs, collaborate on API collections using Git, and publish interactive API documentation. Especially valuable for those seeking a privacy-first, local-first alternative to cloud-dependent API clients.

Common actions

test APIs

manage API collections

version control APIs

mock API responses

publish API documentation

APIGitHubopen-source

Capabilities

Key features

Git integration
Offline support
Multi-protocol capabilities
Advanced request editor
Dynamic variable system
API mocking
API publishing

Target Audience

developer

Integrations

github

Pricing & Plans

Freemium · Open Source

Free non-commercial, personal use

FAQs

Is Echolon truly free for personal use?

Yes, Echolon is completely free and open source for personal use, including all core API client functionalities. Optional paid features are available for teams and enterprise users requiring advanced collaboration and support.

How does Echolon handle data privacy and security?

Echolon is local-first, meaning your data never leaves your machine unless explicitly synced via Git. It doesn't collect telemetry, track usage, or require an account. Sensitive values can be encrypted at rest, ensuring high privacy.

Can I import existing API collections from other tools?

Absolutely. Echolon supports one-click import from popular tools like Postman, Insomnia, Bruno, OpenAPI/Swagger specifications, and even cURL commands, making migration of your existing workflows straightforward.

What API protocols does Echolon currently support?

Echolon currently supports REST/HTTP and WebSocket protocols. GraphQL support is actively on the roadmap, indicating future expansion of its multi-protocol capabilities for diverse API testing needs.

How does Echolon facilitate team collaboration?

Teams can collaborate effectively by storing API collections in a shared Git repository. Changes are managed through standard Git workflows, allowing for version control and seamless merging of updates among team members.

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