The tool works by simulating the appearance of your email subject line in various email clients and devices, so you can make necessary adjustments and ensure your subject line looks and performs well across the board.

The benefits of using an email subject line previewer tool include improving email open rates by creating subject lines that are engaging, eye-catching, and relevant. Additionally, it helps ensure that your subject line doesn't get cut off, truncated, or distorted, resulting in a more professional and polished email.

Yes, using an email subject line previewer tool can help improve email open rates by allowing you to create subject lines that are optimized for different email clients and devices.

An email subject line previewer tool supports a range of email clients and devices, including Gmail, Outlook, Yahoo, iPhone, Android, and more. However, the exact email clients and devices supported may vary depending on the specific tool you are using.