You can access ProtonVPN using two sets of credentials, your ProtonVPN login credentials, and OpenVPN / IKEv2 credentials. This article explains the difference between Proton credentials and OpenVPN / IKEv2 credentials, what they are used for, and where you can find them.
Your Proton credentials are the username and password you choose during signup. They are used to log in to all Proton services (such as ProtonVPN and ProtonMail). For ProtonVPN, you use your Proton credentials for:
Your OpenVPN/IKEv2 credentials are automatically generated. They are used together with third-party VPN clients, such as Tunnelblick on macOS, or the older community OpenVPN package on Linux.
Note: The new official Linux and macOS clients use your regular Proton credentials.
For detailed guides on how to connect to ProtonVPN in these ways, check out our step-by-step installation guides for macOS and Linux (note: where possible we recommend using the official ProtonVPN clients for Linux or macOS instead).