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s4m runs on the official, open-source WireGuard and OpenVPN clients — audited by the community, not a binary of ours. Install one, import your config, and you're connected.
WireGuard — recommended
Modern, fast to connect, and the easiest to set up. Import the .conf or scan the QR code from your dashboard.
OpenVPN
Maximum compatibility — use it where WireGuard is blocked or unavailable. Import the .ovpn profile from your dashboard.
🛑 Kill switch: block traffic if the tunnel drops
A kill switch has to be enforced on your device, so it lives in the app — not on our servers. The official WireGuard app has it built in: enable "Block untunneled traffic (kill-switch)" in the tunnel settings on Windows/macOS, or the on-demand/kill-switch toggle on mobile. For OpenVPN and advanced setups we also ship downloadable firewall rules (nftables / Windows / pf) that only allow traffic through the tunnel.
Kill-switch setup guide →Ready to connect?
Create an account, grab a WireGuard or OpenVPN config, and import it into the app above.
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