Bosun
See every open port, tunnel, and container on your Mac
What this is
A macOS menu bar app that shows every open port, tunnel and container instantly, so developers stop losing time hunting through Terminal or Activity Monitor to find what's using a port.
Our one-line summary — not the founder’s tagline.
- How it works
- A native macOS menu bar app that shows every listening TCP port, active ngrok/Cloudflare tunnel, and VPN connection status at a glance, grouping multiworker services into single rows.
- What's different
- Shows what's actually reachable on the machine right now, versus tools like lsof or Activity Monitor that only show a port without full context.
- Pricing
- Free.
- Best for
- Developers running local services who need to quickly find which process or container owns a given port.
What we measured
Nobody else publishes this — it comes from knocking on the door every day.
- Watched by us
- 12 days
- Last checked
- 5d ago
Where it shows up
Every group here is a page of its own — each one checked daily.
The numbersIs it still shipping, is it overpriced, where did it land — and what the price is built from.
League price & chart
No money. No seat. It goes on your record — and in 28 days reality settles it.
Calls are closed while we rebuild accounts. You can still read every one of them.
Analytics. Launched 12d ago on PeerPush, where it placed #553. Today, the site itself changed 6d ago — evidence it's still shipping, not just announcing.
Quiet for 5 days — no penalty yet, but quiet doesn't stay free.
We check this site every day, ourselves. A founder can post “still working on it” — a claim like that doesn't price. What we price is what we can verify from the outside: evidence, not announcements. The real question isn't “will this be huge?” — it's “will they still be moving in four weeks?”
The market viewHow this launch is priced and ranked in our league — the investor side of the page.
ranked by the reality anchor, not the market price
It placed #553 on PeerPush with 4 votes. It also showed up on 1 other board — but didn't place well enough on any of them, so none of them add to the price. Listing on twelve directories is free; placing well on them isn't.
No matter how much money goes in. There is no pump here — you can't make yourself right by buying more. The line only moves on things that actually happened: an award, revenue that grew, a new platform, code that shipped — or silence.
2 quiet days in between are left out — nothing happened on them. A launch that goes quiet eases down a little at a time — never a cliff you could have run from the night before.
How the launch is moving on its own board, day by day — the crowd's attention.
A flat line is normal: votes stop within a day or two of launch, on every board. What's unusual — and what actually counts — is a launch that keeps pulling votes long after its day is over.
About
Bosun is a native macOS menu bar app that gives you instant visibility into everything your Mac has open to the network, without touching Terminal or Activity Monitor. I built it after losing an hour tracking down which of six Docker containers was squatting on port 5432. Turns out lsof and Activity Monitor show you a port, not what's actually reachable on your machine right now. Every developer running local services ends up with the same problem: which container, tunnel, or leftover process owns this port, and is it something I forgot to close? Bosun answers that in one glance from the menu bar: - Every listening port (TCP), refreshed automatically, grouped by port number so multiworker services like Odoo or gunicorn collapse into one row instead of ten - Active ngrok and Cloudflare tunnels (named and quick tunnels), with the public URL one click away - VPN connection status for native macOS VPN configurations - Docker containers, showing the actual image name and Compose project instead of just "docker-proxy" - SSH -L port forwards, parsed and shown automatically - Per process CPU, memory, and uptime, on demand - One-click kill: graceful SIGTERM first, SIGKILL only if the process lingers, with group kill for multiworker services so you free the port instead of killing one worker at a time - Persistent port history with configurable retention, so you can see what was running earlier, not just right now - Global hotkey to open Bosun from anywhere Why it matters beyond convenience: a tunnel or forwarded port you forgot about is a documented way attackers keep quiet remote access once they're in. Bosun makes "what's actually exposed right now" a one-glance answer instead of something you have to go hunting for. Under the hood, Bosun is 100% native Swift and SwiftUI, no Electron, no Chromium, minimal memory and CPU footprint even with the menu bar open all day. There's no telemetry on your actual port, process, or network data, that stays local to your Mac (disclosed in full in the privacy policy at bosun.dev). Bosun requires macOS 14.0 (Sonoma) or later. It's a paid app with a 14-day free trial that starts the moment you open it, no signup or account required to try the full feature set. Pricing: Solo $12.99, Pro $21.99, and an Enterprise seat tier at $6.99/seat for teams. Built solo, and still actively maintained, if you run a lot of local containers, dev tunnels, or VPN connections day to day, I'd love your feedback.
Where it launched
2 platformsThe board it did best on sets the price. Every other board only adds to it if the launch also placed high on that board too — because just showing up somewhere isn't an achievement. Listing on twelve directories is free; placing well on them isn't.
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