Echo
Here at Gapfy, we spend our days building APIs, so we know what a good API client should feel like and how rarely one delivers it. Echo is our answer. It is quick, it is clear, and it treats testing as work that deserves real tools, not a cluttered tab you put off opening.
Microsoft Store
App Store
Google PlayBuilt for the work, not for the demo
Echo is a desktop client for testing HTTP and gRPC APIs. It opens fast, it stays out of your way, and every request you send comes back readable, with the status, the timing, and the body laid out so you understand it at a glance. Organize your requests into collections, keep your environments tidy, and stop hunting for the call you made last week.
- Test HTTP and gRPC APIs from a fast, native desktop client.
- Read every response at a glance: status, timing and body, laid out clearly.
- Organise requests into collections and keep environments tidy.
- Find the call you made last week without hunting through tabs.
See the difference, side by side
The feature we are proudest of is the one we needed the most. Point a single request at two environments, your staging and your production for example, run them together, and Echo shows you both answers next to each other with every difference highlighted. The moment something behaves differently between environments, you see it plainly, instead of guessing.
- Point one request at two environments and run them together.
- See both responses side by side with every difference highlighted.
- Catch a config drift between staging and production the moment it happens.
Serious where it matters
Echo carries the things teams genuinely need and usually have to pay dearly for: shared workspaces, real access control, single sign on, and an audit trail you can stand behind. It signs in with your Gapfy account and sits comfortably beside the rest of the family. Enterprise care, without the enterprise theatre, because solid tools should never be a luxury.
- Shared workspaces and real access control for your team.
- Single sign-on and an audit trail you can stand behind.
- Signs in with your Gapfy account, beside the rest of the family.
One client for every API
We call APIs for a living, so we were hard to please when we built our own client. Echo is native, fast, and honest about what happens on the wire.
Five protocols, one editor
HTTP, gRPC with real reflection-based transport, GraphQL with introspection and subscriptions, WebSocket with a binary hex view, and SSE with auto-reconnect. No plugins, no context switching.
Compare across environments
Fire the same request against up to 4 environments in parallel. Side-by-side responses with a structural JSON diff and synced scrolling show exactly what changed.
Collections built for teams
Spaces, infinitely nested folders, drag and drop, bulk operations. Share with your team at Read, Contribute or Full Access, with in-app people search.
Environments and variables
Space-scoped environments with secret variables and a global active-environment picker. Live {{variable}} highlighting and autocomplete keep every request readable.
Automation without ceremony
Collection runner, declarative request chains with JSONPath extraction, local mock servers, cron-scheduled runs with failure notifications, plus pm.* scripting when you want code.
Private by design
Guest mode works offline with no account and no limits on the local loop. The entire local database is encrypted at rest.
Sync that follows you
Collections, environments, schedules, mock servers and even deletions sync across devices, with conflict capture and one-click repair. The mobile companion for Android and iOS is arriving on Google Play and the App Store.
Bring your collections
Import Postman collections and environments with full round-trip fidelity, plus Insomnia, Bruno, OpenAPI 3 and cURL. Export back to Postman formats any time.
AI that respects secrets
With a Pro AI seat, explain responses and errors, generate requests, tests, mocks and docs. Secrets are redacted deterministically before anything leaves your machine.
From solo debugging to team workflows
Echo starts as a fast local tool and grows with you. Sign in when you are ready to share, and keep full control of your data the whole way.
Share collections, keep control
Share a collection at Read, Contribute or Full Access, picked per person with in-app people search. Everyone works from the same source of truth.
Desktop today, pocket soon
Echo is native Windows from the Microsoft Store, no Electron in sight. A mobile companion for Android and iOS with the same sync engine is on the way.
Local first, never hostage
Guest mode needs no account and never limits the local loop. Your data lives in an encrypted local database, and you can export to Postman formats any time.
Documentation
Step-by-step guides for getting started, organizing your work, and going deep on every feature.
Free, Pro and Pro AI
Free is generous for everyday testing. Pro lifts the limits and adds team controls; Pro AI adds the assistant that writes tests and explains failures for you.
Test your APIs the way they deserve
Echo is ready to download today. Bring clarity to your API work and let every request come back loud and clear.
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