KeePassium

KeePassium is a password manager that reads and writes KeePass databases on iOS and macOS. The project calls itself a commercial open source app: the commercial side funds maintenance and premium support, while the open source side lets anyone audit the code and build the app themselves. It is aimed at people who want the KeePass ecosystem with a native Apple interface.

It synchronizes databases automatically through the system's own storage integration, so it does not ask for your cloud credentials, and works with iCloud Drive, Dropbox, OneDrive, Google Drive, Box, Nextcloud, SFTP and others. Password AutoFill is supported on iOS. Protection includes Face ID or Touch ID, passcodes, and customizable timeouts for the app, database and clipboard. It handles the kdbx4, kdbx3 and kdb formats with ChaCha20, Argon2, AES, Salsa20 and Twofish, and supports TOTP codes including Steam TOTP, YubiKey challenge-response, attachments, custom fields and custom icons.

Several databases can be used and switched between, and there are no ads. The code is written in Swift, and the repository metadata lists the license as Other, so read the license file for exact terms. The README has a section on whether the app is free; check the vendor for current pricing.