macOS port monitor for developers

Every port,
process & pulse —
docked.

Pier is a featherweight monitor that lives in your menu bar. See what's listening on every port, which process is hogging the CPU, and your system's vitals — then act on them in one click.

↓ Download for macOS Apple Silicon & Intel · macOS 14+
or install with Homebrew
Native SwiftUI ~0% CPU at idle No app tracking EN / 中文
Pier ports panel Pier ports panel
// FOUR PANELS, ONE CLICK AWAY

Your Mac, read like an instrument panel.

Flip between four panels from the menu bar. Look, understand, and act — without ever opening a terminal.

Pier portsPier ports
01 — PORTS

See what's listening

Every TCP & UDP port, the owning process and its app icon, the bound address, and an IPv4·IPv6 tag. A glance tells you what's exposed to the network — and one click ends it.

TCP / UDPIPv4 · IPv6exposure alertone-click kill
Pier processesPier processes
02 — PROCESSES

Find the hog, fast

Top processes ranked live by CPU or memory, with instant name search that goes beyond the Top N cap — find the background app that's been hiding past the cutoff. Expand any row for the full command line, path, and parent; then end or force-quit it.

CPU / memoryinstant searchfull command linesystem-process guard
Pier systemPier system
03 — SYSTEM

Vitals at a glance

CPU, memory, swap, disk, and live network throughput in one tidy panel. Pin any combination of CPU, memory, and network rates right next to the menu-bar icon — pick what you care about, leave the window closed.

live throughputmenu-bar readoutmulti-metric
Pier dev toolsPier dev tools
04 — DEV TOOLS

Skip the terminal

Start, stop, and restart your Docker / Podman containers and Homebrew services straight from the menu bar. Pier even detects when your docker is really Podman.

Docker · Podmanbrew services
// RECENT UPDATES

Quieter, quicker, more compatible.

⌕

Process search

Type a name — Pier finds it even if it's a sleepy background app buried past the Top N cutoff. Pair it with the new configurable Top N (10–500, or show all) in Preferences.

15

Complete on macOS 15

Sequoia quietly tightened lsof's access to root-owned sockets, hiding launchd / system daemons / privileged ports. Pier now combines lsof + netstat so the port list stays whole — every listening socket, regardless of owner.

✓

Quieter startup

Dev tab no longer hangs when Docker's daemon is off (6s hard timeout). Launch and licensing flows stay quiet unless you need them.

// LOCAL DEV WORKFLOWS

Built around the checks developers repeat every day.

Pier is most useful when a local service, container, or background process is sitting between you and the next run.

PORT IN USE

Kill the process using a port

Find port 3000, 5173, 8000, or any other listener, inspect the owner, then stop it safely.
PORT MONITOR

See every listening port

Turn lsof and netstat output into a readable app, process, PID, protocol, and address list.
CONTAINERS

Understand Docker and Podman ports

Keep container status and published host ports next to your local macOS port list.
BREW SERVICES

Restart Homebrew services

Start, stop, and restart brew-managed databases and background services from the menu bar.
// WHY PIER

A monitor that doesn't become the problem.

~0%
Featherweight
Native SwiftUI. Idle CPU rounds to zero — it samples only when you're looking.
100%
Local & private
No accounts, no ads, no app telemetry. Your ports, processes, and system data never leave your Mac — Pier only goes online to check for updates and verify your license.
⌘
Always in reach
Lives in the menu bar. One click in, one click out — no Dock clutter.
Bilingual & dark
English / 中文, switchable instantly. Light, dark, or follow the system.
// PRICING

Pier on your Mac.

Universal build · macOS 14+ · Apple Silicon & Intel

$6.99 Suggested price — pay what you want, from $0.99 one-time purchase · activates on up to 5 Macs
  • You choose the amount at checkout — every price unlocks the same full license
  • 14-day free trial, no credit card
  • All features + all 2.x updates
  • Universal build — Apple Silicon & Intel
  • Developer ID signed & notarized
Buy Pier — pay what you want
or try free for 14 days →
or install with Homebrew
// FAQ

Good questions.

How does pay-what-you-want pricing work?+

At checkout you type the amount yourself — minimum $0.99, suggested $6.99. Whatever you pay, you get exactly the same thing: one full license, up to 5 Macs, all 2.x updates, one-time. No tiers, no hidden upsells. If Pier saves you time, pay what it's worth to you.

Why isn't Pier on the Mac App Store?+

Pier needs to see every process and act on it — listing ports, reading other processes, ending them. The App Store sandbox forbids that. So Pier is distributed directly, signed with a Developer ID and notarized by Apple, so Gatekeeper trusts it.

How do I move my license to a new Mac?+

Two steps. If the old Mac is still around: open Pier's Preferences → License and click Deactivate on this Mac — that frees up its activation slot. Then enter the same license key on the new Mac. Old Mac already wiped or gone? Just activate on the new one — one key covers up to 5 Macs, and if you ever run out of slots, email pier@appsupport.mahui.me and we'll release the ones held by retired machines. There's no account to sign in to: your key is the license. Upgrading macOS doesn't touch your activation; before erasing a Mac, deactivate first so the slot comes back.

How do activation slots work?+

Each activated Mac holds one of your license's 5 slots. Deactivating (Preferences → License → Deactivate on this Mac) releases its slot instantly, so you can move between machines freely — fully self-serve. If a Mac was wiped, sold, or died before you could deactivate, email pier@appsupport.mahui.me and we'll release its slot for you.

I lost my license key. How do I get it back?+

Your key is in the purchase confirmation email from Dodo Payments (our payment provider). Can't find it? Email pier@appsupport.mahui.me from the address you used at purchase and we'll look it up.

Which updates are included?+

All 2.x releases — features and fixes — at no extra cost. Your license is perpetual: the versions you've bought keep working forever, with no subscription and no forced upgrade. If a paid 3.0 ever happens, 2.x will keep working as-is.

Does it phone home?+

Your monitoring data never does — ports, processes, and system stats are read on-device and never uploaded. Pier itself goes online only to check for updates (you can turn that off) and to activate and periodically verify your license. No third-party analytics or ad trackers.

Will it slow down my Mac?+

It's built in native SwiftUI and samples only while a panel is open or a menu-bar readout is enabled. Idle CPU rounds to zero — a resource monitor shouldn't be a resource hog.

Which Macs are supported?+

macOS 14 (Sonoma) and later, on both Apple Silicon and Intel.

Can I kill any process?+

You can end any process you own. System processes (owned by root) are flagged and guarded with a confirmation — and ending a launchd-managed daemon will just respawn it, which Pier tells you up front.