1Password
1Password is renowned for its user experience. It is feature-rich and is well-supported across all devices and browsers. Its macOS and iOS apps are more polished, but the rest of its apps have recently caught up in terms of feature parity.
Features
Partial User Support
Forum, community app or email where support within 24 hours is available
Regular Audits
Independent security audits are conducted periodically and publically accessible
Email Masking
An temporary email address that can be used to sign up for hiding your true identity
Platforms
Browser
Accessible through any web browser
Windows
Available app for Windows computers
Mac OS
Available app for macOS computers
Linux
Available app for Linux computers
Android
Available on any Android devices
iOS
Available on any iOS devices