Cloud-based password managers like LastPass, 1Password, and Bitwarden store your encrypted vault on their servers. While the vault is encrypted, these services know your email address, IP addresses, device fingerprints, and when you access your passwords. For Tor users maintaining anonymous identities, this metadata is a significant liability.
If a cloud password manager is compromised - as LastPass was in 2022 - attackers obtain encrypted vaults that they can attempt to brute-force offline. The breach also exposed customer email addresses, billing information, and vault metadata. For anonymous users, even the existence of an account is a data point that should not exist.
KeePassXC stores your password database as an encrypted file on your local device. There is no account, no cloud sync, no server, and no metadata leakage. The database file can be stored on an encrypted USB drive, backed up to encrypted storage, or synced between devices using OnionShare or any file transfer method you trust.