Gapfy Echo overview

Gapfy Echo is a native Windows API client in the spirit of Postman, built with Avalonia instead of Electron, so it starts fast and stays out of your way. Echo is a module of the Gapfy platform, installs from the Microsoft Store, and comes in Free, Pro and Pro AI tiers.

One editor, five protocols

Echo speaks HTTP, gRPC, GraphQL, WebSocket and SSE in a single editor. gRPC uses real reflection-based transport with service discovery and every streaming mode, GraphQL brings introspection, variables and subscriptions, WebSocket adds interactive send with a binary hex view, and SSE reconnects automatically. The details live in /docs/echo/requests-and-protocols.

Built for real work

Collections live in spaces with infinitely nested folders, drag and drop, and bulk operations, and you can share them with teammates at Read, Contribute or Full Access. Space-scoped environments with secret variables keep configuration out of your requests, and compare mode fires one request against up to 4 environments side by side with a structural JSON diff. Automation covers a collection runner, declarative request chains, local mock servers, cron-scheduled runs and pm.* scripting. Start with /docs/echo/collections-and-sharing and /docs/echo/automation.

Private and local first

Echo works offline in guest mode with no account and no limits on the local loop. The entire local database is encrypted at rest, with the key held in Windows DPAPI. When you are ready for the connected features, you sign in with Microsoft Entra External ID through your system browser, and your collections, requests, environments, schedules, mock servers and even deletions sync across devices with conflict capture and one-click repair.

Everyday comforts

Request history with filters, a cookie jar with an editor, a network timing breakdown with a slower than usual badge, split view up to 4 panes, a command palette, rebindable shortcuts, a 7-language UI, and light and dark themes. A mobile companion app for Android and iOS, sharing the same sync engine and encrypted database, is arriving on Google Play and the App Store.

Where to go next

  • Install and send your first request: /docs/echo/getting-started
  • Protocols, auth and timing: /docs/echo/requests-and-protocols
  • Environments, secrets and compare mode: /docs/echo/environments-and-variables
  • Organizing and sharing collections: /docs/echo/collections-and-sharing
  • Runner, chains, mocks and schedules: /docs/echo/automation
  • Moving from Postman, Insomnia, Bruno or OpenAPI: /docs/echo/import-export
  • AI assists with a Pro AI seat: /docs/echo/ai-features