Which is more secure ?

Hi @ttim03,

They're both secure to use. 1Password 6 is more modern with an internal database that's using stronger encryption protocols that would be slower to use in 1Password 4. However, 1Password 6 does support both AgileKeychain/OPvault formats that 1Password 4 also uses, so they're equal in that regard because 1Password 6 would have to export to these formats from the internal database. It's when you use 1Password.com service when they're slightly different, 1Password 6 would be slightly more secure.

1Password.com has the benefit of additional security strengthening due to the fact that your 1Password data is stored on our servers and it requires you to know the account key in addition to your master password. You can find out more here: https://support.1password.com/account-key-security/