I just released my most technically complex iOS / Mac app : PanicVault. It was quite a journey to build a cross device password manager, a full website, and a Google Chrome extension whilst doing the formalities associated with releasing an app using cryptography. Have a look: www.panicvault.org
panicvault.org
PanicVault - Secure Password Manager | KeePass Sync & AutoFill
Your passwords, your file, your control. A secure, offline-first password manager using the open KeePass format. No subscription. No cloud lock-in.