grpcui

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Introduction

grpcui is a command-line tool that starts a local web UI for interacting with gRPC servers. The README compares it to Postman for gRPC and describes it as an extension of grpcurl: where grpcurl is a CLI, grpcui gives a browser-based GUI for building requests.

It discovers services through server reflection, proto source files or protoset files, shows them as a list of endpoints, and generates forms for request messages, including nested fields and repeated values. Responses, headers and trailers are shown in the page.

It is handy for exploratory testing and debugging during development, especially for people who are less comfortable with JSON on the command line.

In the quality loop it supports manual API exploration at the API and integration stages.

The source code is at fullstorydev/grpcui on GitHub under the MIT licence, with about 5,900 stars; the most recent commit was on 15 October 2026.

Features

1. Web UI: Interactive forms for gRPC requests.
2. Reflection and protos: Discover services from servers or files.
3. Message forms: Edit nested and repeated fields.
4. Metadata: Send headers with requests.
5. Single binary: Run locally against any server.

Pros

1. Lower barrier: Easier than raw JSON for new users.
2. Free to use: Open source under the MIT licence, so the core tool costs nothing to use.
3. Actively maintained: The repository had commits as recent as 15 October 2026.
4. Community: About 5,900 GitHub stars.

Cons

1. Exploration only: Not for automated tests.
2. Local UI: No collections or collaboration features.

Usage and Links (Example)

grpcui -plaintext localhost:50051

Resources:

• grpcui website

Pricing

grpcui is free and open source under the MIT licence.

Recommended for?

1. Developers exploring gRPC services.
2. Not a fit for automated checks; use grpcurl or test code.

Conclusion

grpcui is a simple, maintained GUI companion to grpcurl.

On CheckOps, grpcui is filed under the API & contract testing and Integration testing stages. Related tools listed here include grpcurl, Kreya, Postman, Insomnia, Bruno and Yaak. Before choosing, compare them on licence, supported languages and platforms, hosting model, and how well each fits your existing CI pipeline. Facts on this page were checked against the official website, documentation and repository on 11 November 2026; statements the vendor makes about its own product are marked as vendor claims.