NetworkCat

Q: Who makes NetworkCat?

Developer 旭中 何, whose portfolio also includes a Chinese lunar calendar app and an exchange-rate app.

Free

Price checked at source August 29, 2026.

A free TCP/UDP/WebSocket client for testing and debugging your own network programs and devices, from a solo indie portfolio.

Our take

Built for developers debugging network code or hardware (like Modbus devices), not for monitoring your own Mac’s bandwidth: send and receive raw ASCII or HEX data over TCP, UDP, or WebSocket, with request history, an ASCII lookup table, and AT-command line-ending helpers. From 旭中何, a solo developer whose portfolio also includes a lunar calendar and an exchange-rate app — the bundle ID’s reverse-DNS matches the resolved domain exactly.

Visit apps.apple.com ↗

Price: Free
License: Proprietary
Requires: macOS 13 or later, per the Mac App Store listing.
Get it via: Mac App Store
Developer: 旭中何 (xuz.net)

Do you use NetworkCat?

Who made this

旭中何 (xuz.net)

Site (opens in new tab)

Are you 旭中何 (xuz.net)? Claim this profile to add a photo, a bio, and links — or ask us to remove it.

What it does

TCP, UDP, and WebSocket

Client and server modes, plus UDP unicast/multicast/broadcast.

ASCII and HEX

Send and receive in either format, with automatic conversion between them.

Connection history and logging

Searchable send/receive history per target, with timestamps and traffic counts.

The deal

Free

Worth knowing: A network testing/debugging tool, not a bandwidth or connection monitor — despite the section it’s filed under existing for discovery, it doesn’t do the same job as iStat Menus or Stats. The pipeline’s own proposed section (System Monitors) was overridden to Dev Utilities for this reason — Apple’s own listing files it under “Developer Tools.”

NetworkCat — questions people ask

Is NetworkCat free?

Yes, per its Mac App Store listing.

Is NetworkCat a network monitor?

No — it’s a TCP/UDP/WebSocket client for testing and debugging your own network programs or devices, not a bandwidth or connection monitor.

Who makes NetworkCat?

Developer 旭中何, whose portfolio also includes a Chinese lunar calendar app and an exchange-rate app.

Is NetworkCat free?

Yes — NetworkCat is free.

Does NetworkCat work alongside a notch app like Alcove?

Yes — NetworkCat lives in the screen, so it runs happily alongside any Dynamic Island hub or notch app.

Where can I download NetworkCat?

NetworkCat is available via Mac App Store.

Reviews

No public ratings yet. Reader reviews are coming to Kitsmith soon.

Listing hand-verified August 29, 2026 from the developer's site and public sources.

Also in dev utilities

Postman

Free

An API platform for building, testing, and documenting APIs — desktop app and browser version, with AI features layered on top of a genuinely free starting plan.

Screen Homebrew Verified August 27, 2026