Mediator review
A focused open-source GUI proxy for inspecting and redirecting gRPC traffic.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Mediator is an open-source desktop proxy for developers debugging gRPC traffic across Windows, macOS, and Linux. Its GUI brings together request inspection, Protobuf decoding, HTTPS support for gRPC requests, and host rewrite rules for redirecting traffic to beta or test servers. The product is particularly suited to teams working with Protobuf-based services that need to inspect message payloads while developing or troubleshooting distributed applications.
Its standout capability is schema-aware gRPC inspection. Mediator can resolve message definitions through server reflection, compile proto source roots through protoc, or load FileDescriptorSet schemas. That gives developers several ways to decode request and response messages, depending on how their service schemas are managed. Host rewrite rules add a practical development workflow by allowing requests to be redirected without changing the original service configuration. The published feature set is centered on gRPC and Protobuf rather than a broad collection of general web-debugging functions.
Mediator is distributed as Windows MSI, macOS DMG, Apple Silicon DMG, and Linux DEB packages, giving desktop teams platform-specific installation options. The project is licensed under Apache-2.0 and follows an open-source model. Choose it when your work depends on gRPC, HTTPS traffic inspection, Protobuf decoding, and flexible schema loading in a desktop interface. Teams seeking a general-purpose proxy with a wider range of verified web-debugging capabilities should consider a broader alternative.
Mediator pros and cons
- Where it wins
- Decodes Protobuf request and response messages for gRPC traffic
- Supports Windows, macOS, and Linux desktop platforms
- Offers host rewrites, schema handling, HTTPS, and a desktop GUI
- Where it doesn't
- Its focus is gRPC traffic rather than broad web debugging workflows
- Schema resolution requires reflection, proto sources, or descriptor files
- Core proxy capabilities beyond the listed gRPC features are limited
Mediator fact sheet, pricing and score →
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