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.

Hi Product Hunt! I'm excited to share HumanStamp. AI has made great writing accessible to everyone, but it's also made effort invisible. A thoughtful cold email or thank-you note used to signal that someone invested real time. Today, it's impossible to tell. HumanStamp is our attempt to bring that signal back. It's a Chrome extension that verifies how an email was written—not what it says. Everything happens locally on your device, so your email content never leaves your computer. If you personally type more than 50% of a message, you can add a HumanStamp badge before sending. A few questions we'd love your thoughts on: Would a human verification badge change how you read cold emails? Where else would you want to see this kind of trust signal? What's the biggest concern you'd have about a product like this? We would love any feedback. Thank you for checking us out!

Love that everything stays local, feels like the badge actually means something instead of just trusting a sender's word. Curious to see how it holds up with heavy editing and pasted text.

@metinbykl1qe8 Thank you Metin! Feel free to try it out – it takes 30 seconds to add to Chrome and test :) You can see that it holds up with lots of editing and pasted text (and if it doesn't, let me know!)

Love that everything stays local, feels like the badge actually means something instead of just trusting a sender's word. Curious to see how it holds up with heavy editing and pasted text.

HumanStamp

Make effort visible in the age of AI

Make effort visible in the age of AI