Getting started

Gapfy Echo is a native Windows API client. This guide takes you from install to your first response in a few minutes.

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.

Echo is built with Avalonia rather than Electron, so it is a real native app: quick to start and light on memory.

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 a local database that is encrypted at rest, with the encryption key held in Windows DPAPI.

Signing in uses Microsoft Entra External ID with PKCE through your system browser, so Echo never handles your password directly, and tokens are cached encrypted. Sign in when you want the connected features: sync across devices, team sharing, and the workspace switcher if you belong to more than one organization.

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.