grpcui

At a glance

• Editor score
  6.3 / 10
• Pricing
  Open source
• Best for
  Browser-based gRPC debugging
• Paid from
  Free
• Facts checked
  20 Sep 2026

• Where it wins

  • Discovers services through reflection or supplied protobuf definitions
  • Supports unary and streaming RPCs with dynamic forms and JSON editing
  • Displays response metadata, headers, trailers, and errors

• Where it doesn't

  • Focused on gRPC rather than broad API-client workflows
  • Requires server reflection or supplied .proto and protoset files for discovery
  • Runs a local web interface from a command-line tool

Our verdict on grpcui

grpcui is an open-source command-line tool that starts a local web interface for interacting with gRPC servers. It is aimed at developers exploring, testing, debugging, or prototyping gRPC APIs without writing a separate client application. The browser interface connects with gRPC and Protocol Buffers, and the project also provides Go packages for embedding the UI in Go servers. It supports web, Windows, macOS, and Linux environments.

Service discovery can use gRPC server reflection or supplied .proto and compiled protoset files. Once definitions are available, developers can construct requests through dynamic forms for protobuf message fields or edit and submit JSON. grpcui supports both unary and streaming RPCs, along with TLS and mutual TLS connections. Its response views include messages, metadata, headers, trailers, and errors, giving debugging workflows visibility into more than the returned payload alone. These features make it a practical fit for teams working directly with gRPC schemas and transport behavior.

The product’s main strength is its narrow focus: it concentrates on browser-based gRPC interaction rather than presenting a broad, general-purpose API client. That focus suits developers who need to inspect services, send structured requests, and examine detailed responses across gRPC environments. It is less suitable for teams seeking a wider API-client workflow beyond gRPC, or a tool centered on general API protocols. Choose grpcui when gRPC reflection, protobuf definitions, streaming, TLS, and response diagnostics are the priority; choose an alternative when broader API coverage is more important.

Your product? Our editors can test grpcui in depth and publish a review, labelled as paid · from $149/mo →

grpcui pricing

grpcui fact sheet

grpcui integrations

grpcui lists 3 integrations on its own site.

• gRPC
• Protocol Buffers
• Go

Alternatives to grpcui

• PostmanA broad API workspace spanning requests, testing, mocking, specifications, and delivery workflows.9.4
• SoapUIA mature, testing-focused API client for REST, SOAP, GraphQL, and CI workflows.9.2
• ApidogA broad API workspace for teams that want design, testing, mocks, and CI/CD together.8.8

See all grpcui alternatives →

Featured on iTechGuides

grpcui is listed in our API Clients directory. Add the badge to your site — it links back to this page.

<a href="https://www.itechguides.com/products/grpcui/"><img src="https://www.itechguides.com/best/badge/grpcui.svg" alt="Featured on iTechGuides" width="230" height="46"></a>

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update