Getting started

Gapfy Echo is an API client for Windows and macOS on Apple silicon. This guide takes you from installation to your first response.

Install from the Microsoft Store

  1. Open the Microsoft Store on your Windows machine.
  2. Search for Gapfy Echo and install it.
  3. Launch Echo from the Start menu.

Install on a Mac

  1. Download Echo for macOS on Apple silicon.
  2. Open the .pkg file and follow the installer.
  3. Open Echo from Applications.

This download is for Macs with Apple silicon, including iMac models with an Apple chip. It is not an Intel Mac installer. The steps below apply to both desktop versions.

Choose guest mode or sign in

Echo does not force an account on you.

Guest mode works completely offline. There is no account, no sign-up, and no limits on the local loop: create as many requests, collections and environments as you like. Everything is stored on your machine in an encrypted local database. Windows DPAPI protects its key on Windows; Keychain protects it on macOS.

Sign in through your usual browser when you want to sync across devices, share work with your team or switch between your organizations.

You can start in guest mode today and sign in later. Nothing you build locally is wasted.

Send your first request

  1. Create a new request and pick a protocol. HTTP is the natural starting point; gRPC, GraphQL, WebSocket and SSE are covered in /docs/echo/requests-and-protocols.
  2. Enter the URL of an endpoint you want to call and adjust the method, headers or body as needed.
  3. Send the request.
  4. Read the response in the viewer, then check the network timing breakdown to see where the time went: DNS, TCP, TLS, time to first byte and download.
  5. Save the request into a collection so you can find it again. Collections are covered in /docs/echo/collections-and-sharing.

Bring your existing work

If you are coming from another client, you do not have to start over. Echo imports Postman collections and environments with full round-trip fidelity, plus Insomnia, Bruno, OpenAPI 3 specs and cURL commands. See /docs/echo/import-export.

Next steps

  • Learn the five protocols and auth handlers in /docs/echo/requests-and-protocols.
  • Set up environments and secret variables in /docs/echo/environments-and-variables.
  • Automate tests, mocks and scheduled runs in /docs/echo/automation.
  • If your organization has Pro AI seats, see what the assists can do in /docs/echo/ai-features.