Limited support (no background sync, files have to be imported and exported manually): Mega, Cryptomator (it supports only import/export operations).

Full support (files are automatically downloaded and uploaded when changed): iCloud Drive, Box, Dropbox, Google Drive, OneDrive, Resilio Sync, Nextcloud (with hiccups), SFTP / WebDAV (via third-party apps).

KeePassium relies on OS-provided integration with storage providers, and supports most providers that appear in iOS Files app.

Viewing TOTP codes (both RFC-6238 and Steam TOTP).

Easy switching between multiple databases.

ChaCha20, Argon2, AES, Salsa20, Twofish algorithms.

kdbx4 (KeePass 2.35+), kdbx3 (KeePass 2.x) and kdb (KeePass 1.x).

Read/write support for all KeePass formats:.

Database names and app settings are also protected.

Customizable timeouts for app, database and clipboard.

Biometric (Face ID / Touch ID) and passcode-based protection.

Password AutoFill (iOS 12+) - also with synchronization.Works with iCloud Drive, Dropbox, OneDrive, Google Drive, Box, Nextcloud, SFTP, and probably more.Integrates with the system, does not ask for your storage credentials.Automatic database synchronization with zero setup.

The 'open source' part gives you the transparency expected from a password manager: you can personally audit the code and build the app you can trust. The 'commercial' part gives you a well-maintained app with premium support. KeePassium is a commercial open source app. It offers automatic database synchronization, respect to privacy and premium user experience. KeePassium is a KeePass-compatible password manager for iOS.

Kdbx ios