A powerful, git-native and local-first API client built with Electron and React.

• Collections & Requests: Organize your API requests in collections and folders
• Environment Variables: Manage different environments with variables
• Request Builder: Full-featured request builder with params, headers, body, auth
• Response Viewer: View responses with syntax highlighting and search
• API Mocking: Advanced API mocking features (cloud + local)
• History: Track all your request history
• Imports: Import OpenAPI/Swagger or Postman files
• cURL Export: Export requests as cURL commands
• Dark/Light Mode: Beautiful themes for any preference
• Completely Local: All data stored locally, no account required
• Git Client: Integrated Git Client to share workspaces/collections with your team

Echolon is a open source project. There is a paid version if you want to support the future development. It offers features that are required on a larger scale but 95% of its features are completely. The commercial usage applies to the binaries downloaded from Github or echolon.app. If you want to build the project yourself it is 100% free.

• Website: echolon.app
• Download: echolon.app/download
• Pricing: echolon.app/pricing
• Docs: docs.echolon.app
• Support: support@echolon.app
• Sample API: sample-api.echolon.app

• core -> Echolon electron app
• docs -> astro based documentation
• sample-api -> Echolon sample api
• web -> Echolon web version

• Node.js 18+
• npm or yarn

cd core
# Install dependencies
npm install

# Start development server
npm run dev

cd core
# Build for all platforms
npm run package:all

# Build for specific platform
npm run package:mac
npm run package:win
npm run package:linux

cd core
npm run release:all 

cd web
npm run deploy 
npm run deploy:lib

For macOS code signing, set these environment variables:

CSC_LINK=/path/to/certificate.p12
CSC_KEY_PASSWORD=certificate_password
APPLE_ID=your@email.com
APPLE_APP_SPECIFIC_PASSWORD=xxxx-xxxx-xxxx-xxxx
APPLE_TEAM_ID=XXXXXXXXXX

For Windows code signing (optional, without you get a warning on install):

CSC_LINK=/path/to/certificate.pfx
CSC_KEY_PASSWORD=certificate_password

For linux builds:

brew install rpm  

• Electron - Cross-platform desktop app
• React 18 - UI framework
• TypeScript - Type safety
• Vite - Fast bundler
• Ace Editor - Code/JSON viewer

MIT