Mediator

Windows · Mac · Linux

Freedom report

Three barsScore 6.5

Mediator is ranked #6 of 27 in web debugging proxies on Freedom251. It runs on Linux, macOS, Windows. There is a free plan.

Mediator plans and pricing

Free Free Cross-platform GUI gRPC debugging proxy · Apache-2.0 licensed github.com · 4 Oct 2026

Purpose: Mediator is a cross-platform GUI proxy for debugging gRPC traffic.
Host rewrite: It can redirect requests to beta or test servers without changing client code.
Protobuf decoding: It parses gRPC request and response messages and can render binary messages as a JSON tree when an API schema is available.
HTTPS inspection: It can decode gRPC/HTTPS requests when a server rule matches, using a Mediator root certificate installed in the client.
Certificate handling: Each installation generates its own root certificate, available in DER and PEM formats, and a different installation requires reinstalling its certificate.
Schema sources: Mediator supports gRPC server reflection, proto source roots compiled with protoc, and FileDescriptorSet files as API schema sources.
Client examples: The README gives proxy setup examples for Java, Objective-C/iOS, and Go clients.
Proxy default: When the app opens, its proxy server listens on port 8888 by default.
Desktop downloads: The project lists Windows MSI, macOS DMG, Apple Silicon macOS DMG, and Linux deb distributions.
Desktop framework: The project says it uses Netty for the proxy protocol, Compose Desktop for the GUI, and Sisyphus as the Protobuf runtime.
License: The repository identifies its license as Apache-2.0.
Intended users: The repository describes the product as a gRPC debugging proxy and provides setup instructions for developers configuring gRPC clients.
Price from: Free

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.