Effort used to be a signal. A thoughtful cold email or thank-you note showed that someone had invested real time. Today, AI can write polished emails in seconds, making genuine effort impossible to see.
HumanStamp makes effort visible again. It's a Chrome extension that verifies how an email was written—without the content ever leaving your device. If you personally type over 50% of a message, you can add a HumanStamp badge. Recipients with the extension can hover over the badge to verify it.
