If you already have an individual Proton Account, you can switch to Proton Family in your account dashboard.

You can have up to six members in total on your Proton Family plan. All they need to join is a Proton Account. If they don’t already have one set up, they can easily create one for free.

Proton Family provides 3 TB of storage space to share between family members. Upon signing up, you will be prompted to allocate storage space to each account. If your needs change, you can always adjust later how much storage each account has.

Each member of your Proton Family plan has their own separate account. Their emails, files, or events remain encrypted with their private key. As a result, you cannot see other family members' data unless they choose to share it with you (for example, by sharing files with you in Proton Drive or by sharing their calendar).

As a legacy Visionary plan holder, you already have access to all the family plan benefits with twice its storage (6 TB) at the same price. There is therefore no reason to switch to a family plan. You can easily invite family members from your account dashboard.

No, anyone with a Proton Account can upgrade their plan to Proton Family and add family members without the need for a custom domain.