KeePassium
KeePass-compatible password manager for iOS and macOS
...The app supports complex encryption standards, including AES, ChaCha20, Twofish and Argon2, and works with KDBX3, KDBX4, and KDB (KeePass 1.x) formats. Because it integrates with the iOS Files system, it supports many storage providers (iCloud Drive, Dropbox, OneDrive, SFTP, WebDAV) with minimal setup, making it flexible for personal, family or team use. Additional advanced features such as TOTP codes, YubiKey challenge-response, file attachments, custom fields and icons make it useful for power users.