Find, 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.

Get ProtoPeekSee how it works

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.

Explore the new workspaceConnect an agentDownload Nightly
ProtoPeek edge workbench with persistent side navigation and six task destinations
Actual edge build · 7 September 2026. Stable installs remain on v0.6.1.

Start with a question.

Pick the thing you are trying to understand. ProtoPeek keeps the evidence together.

Can I reach this service?

Call gRPC or HTTP and see exactly what came back.

Choose gRPC or HTTP

Why is this request slow?

Check DNS, routes, hops, and timing in one path.

Trace the path

What can I verify about this public website?

See DNS, TLS, and response-header evidence when you ask.

See website evidence

What is happening on this device?

Network workspace: listeners, connections, IPs, and bounded speed evidence.

Preview This Device

Can I manage this download locally?

Queue, pause, resume, and verify HTTP(S) transfers.

Meet Downloader

Follow one connected map through every feature, its evidence, and its limits.

Explore all features

One workbench. Real evidence.

Requests, routes, listeners, certificates, downloads, and timing stay together.

ProtoPeek edge Home workspace at 390 by 844 with responsive task cards and a navigation menu
Edge · responsive Home
ProtoPeek edge desktop workspace with six persistent destinations, grouped tools and local task shortcuts
Edge · persistent desktop navigation

Ready when you are.

Install once, then run pp to open the local workbench in your browser.

Other install optionsDownload a release archive
Operating system

Downloads the stable GitHub release. Uses your installed aria2 for downloads.

APT, Snap, Flatpak and other downloads

The GitHub installer above is the default. Signed APT, Homebrew and Scoop are also available. The corrected Snap artifact is attached to the release; the exact protopeek name needs Canonical resolution and classic review. Snap Store and Flatpak are not published.

Microsoft Store certification is in progress. The listing will publish automatically after approval.

Set up APT, then sudo apt install protopeekBrowse release packages

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