Cotunnel

Stop emailing screenshots of localhost. With Cotunnel, you turn a running app on your machine into a secure, shareable URL in minutes. Install the lightweight agent, sign in, pick the local port, and assign a readable subdomain. Hit start, and your site is online with HTTPS. Control who can see it with password protection or IP allowlists. Need reliability? Set the tunnel to auto-reconnect on reboot, use fixed hostnames for stable links, and watch live traffic without touching your router or DNS.

When you’re away from your desk, open a shell to any registered device straight from the web. Manage a Raspberry Pi in your workshop, a Linux VM in the lab, or a Windows box on-site without juggling NAT rules. Launch the browser terminal, authenticate with keys, and run updates, tail logs, or restart services as if you were sitting there. Copy and paste commands, push quick fixes, and move on—no VPN or complex firewall changes.

Speed up reviews and demos. Share a PR build on a temporary link for QA, preview a CMS or static site with editors, or walk a client through a prototype live. Test webhooks from services like Stripe or GitHub by routing callbacks to your laptop and replaying them when needed. Validate OAuth redirects, chatbot endpoints, and mobile app backends against your local server before you deploy. Switch subdomains per branch or feature so each stakeholder has a clean, isolated preview. more