ByHand for Gmail

by Zeila, Inc. · Communication

Manifest V3 in_app

View in Chrome Web Store Data as of 15 Oct 2026

Prove you typed your email yourself. One click in Gmail adds a small certificate that anyone can verify.

Users

+1 in 30 days

Rating

0.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#320K

#253K among extensions

Version

0.1.0

updated 25 Aug 2026

Users

monthly, 2 months

Latest, 15 Oct 2026: 3 usersMove the mouse over the chart for any month

Ratings count

monthly, 2 months

Latest, 15 Oct 2026: 0 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About ByHand for Gmail

Anyone can generate AI slop email now. Which means an email you actually typed is worth something, if you can prove it. ByHand puts a "Certify by hand" button next to Send in Gmail. One click adds a small signature line to your email with a link to a public certificate. Whoever reads it can check that a human typed it. AI-generated text can't be certified. Edit the email after certifying and the certificate comes off. Certify again when you're done. PRIVACY No accounts, no tracking, no analytics. Your words never leave Gmail. A certificate holds a fingerprint of the message, a timestamp, and our signature. Nothing else. Policy: https://byhand.email/privacy $2 a month through Stripe. Unlimited certificates, cancel whenever. We donate the proceeds to artists who make things by hand.