Audited no-logs on Proton-owned VPN infrastructure
Strict no-logs policy for VPN session activity (no traffic content, destination, or session metadata that identifies a user to a server, per published Securitum infrastructure reviews). Account data lives on Proton-controlled servers in Switzerland, Germany, or Norway; Secure Core machines are Proton-owned in CH/IS/SE. Suits privacy officers who need public audit PDFs, not NDA-only claims.
Secure Core double-hop via CH, IS, or SE
Paid Secure Core routes traffic through hardened Proton-owned entry servers in Switzerland, Iceland, or Sweden before the exit country—extra hop against network-level attacks if an exit were compromised. Adds latency; best for high-threat models, not every streaming session.
Stealth protocol and free-tier censorship tools
Stealth obfuscates the tunnel (TLS-over-TCP style) to reduce DPI/VPN-block detection and is available on Free as well as paid apps. Free plan: one device, unlimited data, no ads, limited country set, kill switch; paid unlocks multi-device, streaming profiles, Secure Core, and full NetShield packaging.
Open-source clients across major platforms
Official apps for Windows, macOS, Linux, Android, iOS, and browser extensions are open source on GitHub (ProtonVPN org) with third-party app security reviews published over time. Server-side VPN stack is not a public full OSS product—inspect clients and audit reports, not the entire backend.
NetShield DNS filtering and multi-protocol stack
NetShield is Proton's DNS-based blocker for ads, trackers, and malware domains (feature depth varies by plan). Protocols include WireGuard, OpenVPN, IKEv2, and Stealth; kill switch and leak protections are first-class client features for untrusted Wi-Fi.
Business org controls: SSO, SCIM, dedicated IPs
Proton VPN for Business adds organization admin, private gateways, dedicated servers/IPs, enforced 2FA, SSO, and SCIM provisioning (docs cover Okta/Google examples). Fits SMB remote access and policy control—not a numbered-account anonymity product.