Get a public link to your localhost in 30 seconds. Send it. Done. No deploy queues, no DNS to configure, no servers to spin up. Built for designers, PMs, founders, and anyone else who needs to share what's running on their laptop.
Tunneling sounds technical. The thing it lets you do — share a URL — isn't. Here's what that actually looks like.
Open Figma's local plugin, run a Webflow build, hit play on Framer — share the live URL. Your client sees your laptop, in real time. No staging server, no "can you push it?", no waiting for ops.
Skip the deploy queue when your VP wants to see Friday's PR before Monday's review. Share your localhost build straight to investors, prospects, or your CEO — they get the same URL anyone else gets.
Stop screen-sharing. Send the URL, let prospects click around themselves. Watch every request they make in the inspector — see exactly which features caught their eye.
Your localhost gets a real public URL — Stripe, GitHub, Shopify, Twilio webhooks deliver to it. Inspect every payload, replay any past one to debug. Your /webhooks/stripe handler now has a public address.
We're not going to pretend tunneling is GUI-only. You'll open Terminal once. After that the dashboard does the rest.
One click. No password to remember, no email to verify. Get straight to the dashboard.
Open Terminal. Paste this. Press enter. (Yes, you will need to open Terminal once. That's the entire technical bit.)
curl -fsSL https://login.21tunnel.com/install.sh | shReplace 3000 with whatever port your app is running on. The CLI prints a public https:// URL — copy it, send it.
mytunnel http 3000Every time you push a WIP build to staging just so a client can see it, you're trading 20 minutes of dev time for two minutes of feedback. We thought that was a bad trade.
21tunnel gives you the public URL without any of the deploy ceremony. The same one your CI pipeline would produce — just faster, and with a request inspector built in.
21tunnel is open-source (MIT + Apache-2.0) and on GitHub. The agent runs on your laptop and talks TLS to a server we operate. That server hands incoming HTTPS requests to your laptop over the existing tunnel — no firewall holes punched, no port forwarding.
The whole stack is Rust + Postgres on the server, Next.js on the dashboard, Astro for this site. If you'd rather run it yourself for compliance or air-gap reasons, the self-host page walks through the four-command bootstrap.
Sign up with Google. Open Terminal once. Send a URL.