Can I reach this service?
Call gRPC or HTTP and see exactly what came back.
Choose gRPC or HTTPFind, reach, and inspect services locally.
Inspect HTTP, gRPC, WebSocket, SSE and Cap’n Proto. Find ports, trace a network path, or manage a download. A local Go app does the work; your browser provides the interface.
Local-first. No account.
Nightly: the latest workspace, local AI agents and easy updates.
Keep your place across tools, use command search, and connect your own agent through MCP or the JSON CLI. Nightly follows branch builds; stable remains v0.6.1.
Start with a question.
Pick the thing you are trying to understand. ProtoPeek keeps the evidence together.
Why is this request slow?
Check DNS, routes, hops, and timing in one path.
Trace the pathWhat can I verify about this public website?
See DNS, TLS, and response-header evidence when you ask.
See website evidenceWhat is happening on this device?
Network workspace: listeners, connections, IPs, and bounded speed evidence.
Preview This DeviceCan I manage this download locally?
Queue, pause, resume, and verify HTTP(S) transfers.
Meet DownloaderFollow one connected map through every feature, its evidence, and its limits.
Explore all featuresOne workbench. Real evidence.
Requests, routes, listeners, certificates, downloads, and timing stay together.
Ready when you are.
Install once, then run pp to open the local workbench in your browser.
Installs ProtoPeek. Homebrew supplies aria2; Linux release archives use installed aria2.
Your machine stays yours.
ProtoPeek opens locally. External checks run only when you ask. The interface is served by the app on your machine; there is no hosted account to sign into.
Why a Browser User Interface?- No account
- No ProtoPeek cloud sync
- Clear consent before external checks