Knock: Land your message dead-center on their Mac. Can't ignore

Hey Product Hunt 👋 Solo dev here. The thing that drove me nuts: I'd send a Slack — or an email, or a DM — and the person was heads-down and just… didn't see it. For hours. A blocker, a quick yes/no, a deadline — and I'm sitting there hoping they glance at the right tab. So I built Knock. It lives in your Mac menu bar. You type a line, hit Knock, and your message lands dead-center on *their* Mac and shakes — and pulls the app to the front. They can't not see it. Remember MSN/NateOn nudges? It's that, aimed at whoever's been quiet for an hour. It's more than the knock, too: • 💬 Live notes — quiet pop-ups for the casual stuff, no knock needed • ⏳ Time capsule — schedule a note to open later (off tomorrow? leave a task that lands on a coworker's Mac so they won't forget) • ✏️ Doodle — sketch by hand, shows up like a sticky note • 👥 One circle of up to 5 (team, partner, family) — one purchase covers everyone you invite Tiny native SwiftUI app, no account hoops. $9 once — no subscription, no trial. One purchase unlocks it for your whole circle. What's the message you wish they'd actually seen? Replying to everyone today 🙏