Humanletter Certify Your

HumanLetter - Prove Your Cold Emails Are Human-Written

HumanLetter is the first Gmail extension that certifies your emails are written by humans, not AI or automation tools. Boost your cold email response rates by 58% with verified authenticity certificates!

🚀 Increase Response Rates by 58%

Stand out in crowded inboxes by proving your emails are personally crafted. Recipients trust human-written messages more, leading to dramatically higher engagement and response rates.

✅ Instant Human Verification
Our advanced detection technology automatically verifies that your emails are written by a human in real-time. No setup required - just compose naturally in Gmail and we handle the rest.

🛡️ Build Instant Trust & Credibility
Add verification certificates to your email signatures that recipients can click to confirm authenticity. Show prospects you invested real time and effort in reaching out to them personally.

🔒 Privacy-First Technology
We verify human authorship without storing or accessing your email content. Your privacy and your recipients' privacy are fully protected at all times.

⚡ Seamless Gmail Integration
One-click installation with zero workflow changes. HumanLetter integrates directly into Gmail's composer, automatically adding verification certificates to your outgoing emails.

📊 Track Certificate Performance
Monitor when prospects view your verification certificates and measure the impact on your outreach campaigns with detailed analytics.

💼 Perfect for Sales & Marketing

Cold email outreach
Business development
Recruitment emails
Partnership outreach
Customer acquisition
Any professional communication

🎯 Stand Out From Automation
In a world flooded with AI-generated and automated emails, prove you're different. HumanLetter helps you cut through the noise and connect with real humans.

💡 What is HumanLetter?
HumanLetter is a Chrome extension that adds authenticity certificates to your Gmail emails, proving they were written by a human rather than generated by AI or sent through automation tools.

💡 How does the verification work?
Our proprietary technology analyzes your writing patterns in real-time as you compose emails in Gmail. When human authorship is detected, we automatically generate a unique verification certificate linked to your signature.

💡 Is my email content stored?
No! HumanLetter only verifies that a human wrote the email - we never store, read, or access your actual email content. Your privacy is our top priority.

💡 How do recipients verify authenticity?
Recipients can click on the verification link in your email signature to view a secure certificate page that confirms the email was written by a human, along with verification details.

Pricing: $99/month with 14-day free trial

Support: Available directly in Gmail or contact hello@humanletter.com

Transform your cold email game and start getting more replies today!