Know exactly what's running on every port of your Mac
Portero is a free, open source Mac app that shows every open port and the process behind it. See what's running, kill processes on busy ports, fix 'address already in use' errors, and block ports with the built-in macOS firewall.
I built Portero because I kept losing track of what was running on my own machine. A database from one project, a dev server from another, some API I forgot was still alive since Tuesday... and every time I hit "address already in use" I'd end up googling the same lsof flags for the hundredth time.
The thing is, seeing the ports was never the hard part. Understanding them was. lsof tells you there's a process called "node" on port 3000. Cool. Which node? From which project? Is it safe to kill?
So Portero shows every open port with the process behind it explained in plain words: "Vite dev server, project storefront" instead of just "node". "AirDrop and sharing" instead of "sharingd". It also flags port conflicts automatically, lets you kill processes (gracefully or by force), blocks ports through the built-in macOS firewall, and opens dev servers in your browser with one click.
About Portero on Product Hunt
“Know exactly what's running on every port of your Mac”
Portero launched on Product Hunt on July 14th, 2026 and earned 147 upvotes and 31 comments, placing #6 on the daily leaderboard. Portero is a free, open source Mac app that shows every open port and the process behind it. See what's running, kill processes on busy ports, fix 'address already in use' errors, and block ports with the built-in macOS firewall.
On the analytics side, Portero competes within Open Source, Developer Tools and GitHub — topics that collectively have 625.6k followers on Product Hunt. The dashboard above tracks how Portero performed against the three products that launched closest to it on the same day.
Who hunted Portero?
Portero was hunted by C3B. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Portero including community comment highlights and product details, visit the product overview.
C3B