Litmus

by Litmus Software, Inc. · litmus.com · Developer Tools

Established publisherManifest V3 Free

View in Chrome Web Store Data as of 15 Oct 2026

Personalize & test emails with Litmus—wherever you build.

Users

4,000

0 in 30 days

Rating

4.5 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#15K

#13K among extensions

Version

1.2.1

updated 23 Jul 2025

Users

monthly, 3 years

Latest, 15 Oct 2026: 4,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years

Latest, 15 Oct 2026: 40 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 Litmus

Whether you’re using a local editor or your email service provider’s email editor to create emails, Litmus Extension lets you personalize, preview, troubleshoot, and optimize your email right where you build, saving you time and helping you boost email accuracy & engagement. You can download the Litmus Extension for free, but it requires a paid Litmus account for full access to pre-send email testing and personalization. Learn more and sign up: litmus.com/extension