GMass: Powerful mail merge for Gmail icon

GMass: Powerful mail merge for Gmail

by GMass, Inc. · gmass.co · Communication
FeaturedEstablished publisherManifest V3 Free
View in Chrome Web Store Data as of 15 Oct 2026

A powerful mass email and mail merge system for Gmail.

Users
400K
0 in 30 days
Rating
4.7 / 5
−0.03 in 30 days
Ratings
9,246
−4 in 30 days
Store rank
#738
#675 among extensions
Version
6.0.46
updated 6 Oct 2026

Users

monthly, 3 years
100K250K400KAug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 400,000 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 years
2,0005,6269,253Aug 2023Apr 2025Oct 2026
Latest, 15 Oct 2026: 9,246 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 GMass: Powerful mail merge for Gmail

The easiest way to transform Gmail into a cold outreach, email marketing, and mail merge platform. ** Join the 400,000+ others who’ve given us an average of 4.8 out of 5 stars ** No credit card required + try all features during your free trial! ----------------------------------------- Key features ----------------------------------------- * Send cold email, email marketing messages, and mail merges to thousands of addresses without ever leaving Gmail * Unlimited contacts, campaigns, AND emails * Also: Unlimited email verification and unlimited spam solving (find out and fix issues before you send) * Mail merge personalization with data from Google Sheets * Personalize each mass email (even send personalized images and attachments) * Break Gmail's limits (and we'll help you do it with our in-house sending servers for both opt-in and cold outreach campaigns) * With GMass MultiSend's inbox rotation feature, you can distribute your campaign across multiple accounts * Hit the inbox, not the spam folder. 99% of GMass users report the best deliverability they’ve ever had * Spam Solver - test messages before you send to find spam rates, then use suggested tweaks to improve * Send auto follow-ups based on opens, clicks, and replies. * ChatGPT campaign creation generates an entire email campaign, creates a follow-up sequence, and handles your GMass settings * AI template builder creates beautiful HTML email layouts right in Gmail * Automatically skip sending emails and automations on holidays, and choose custom days of the week to send/not send a campaign * Send triggered emails that go out automatically when a recipient opens or clicks — reach your prospects when you know they're in their inbox * Automate your outreach by automatically sending to new contacts in your Sheet * Connect your CRM or other apps using the GMass API or Zapier * Track opens, clicks, and replies. With instant reply and bounce detection and some of the most accurate open rates you'll find anywhere * NEW! New and improved "friendly" click tracking means links that are more clickable (better for CTR and deliverability) * Free email verification verify email addresses before you send your campaigns * Send transactional emails through Gmail — no external SMTP service required * Help with the Google/Yahoo bulk sender requirements is here. We've also created a one-of-a-kind system to help users with free Gmail addresses sending campaigns via a SMTP server pass DMARC - https://www.gmass.co/blog/gmail-smtp-dmarc/ * Emails can be sent as replies to the last conversation you had with each recipient * Unsubscribe and bounce management to automatically process unsubs/bounces, suppress future messages to those addresses, and more. * Hundreds of other features: Schedule emails, throttle sending speed, custom tracking links with SSL, A/B testing, spintax for varying up your copy (and AI's SpinMax to vary up every message), quick email polls with custom landing pages, add a countdown timer to emails, drip campaigns, HTML editing, 1-click replies, reusable templates, template sharing for teams, and so much more * And yet, even with all these features... sending an email campaign with GMass is just like using regular Gmail ----------------------------------------- Keep up with GMass ----------------------------------------- Website: https://www.gmass.co What makes GMass different/better? https://www.gmass.co/blog/what-makes-gmass-better/ Quickstart guide: https://www.gmass.co/quickstart-guide Blog: https://www.gmass.co/blog YouTube: https://www.youtube.com/gmass/ Support: https://gmass.co/g/support Latest updates: https://www.gmass.co/updates ----------------------------------------- How does GMass compare to other Gmail extensions? ----------------------------------------- Mixmax: cool extension, but you have to use its external web portal to send campaigns. (Also, Mixmax is much more of a sales team management platform than an email sending platform.) With GMass, the magic happens inside Gmail, using just the red GMass button. Yesware: similar to Mixmax, you can't send campaigns inside Gmail. You have to use their web interface. Plus, both Mixmax and Yesware are more expensive than GMass. Mailtrack and Snov.io: Lets you track individual emails, but with GMass, you can eliminate Mailtrack and Snov.io because GMass can track both individual emails and campaign emails. (Use the GMass button on both one-on-one emails and campaigns.) Copper: Good CRM system, but not meant for sending email campaigns. Same for Gmelius and Streak CRM. Lastly, GMass works seamlessly with Grammarly to ensure your campaigns contain perfect prose and are error-free.

Growth

WindowUsersChangeRatingsRating
7 days0+0.0%−2−0.03
30 days0+0.0%−4−0.03
6 months0+0.0%+267−0.04
1 year+100K+33.3%+393−0.04

Chrome Web Store search rankings

Where GMass: Powerful mail merge for Gmail appears when people search the store, with the 30 day change
Search phrasePosition30 days
mail#1+3
gmail#3+3
personalize#12+4
email#14+7
features#24−13
google#53−27
blog#61−22
best#79−24
inbox#88−6
google sheets#96−31
system#97new

Version history

47 versions recorded
6.0.466 Oct 2026
6.0.459 Sep 2026
6.0.4418 Aug 2026
6.0.4330 Jun 2026
6.0.4213 Dec 2025
6.0.4124 Nov 2025
6.0.4026 Oct 2025
6.0.3926 Sep 2025

Details

Category
Communication
First seen
30 Apr 2020
Size
311 KB
Languages
en-US
Pricing
Free
Privacy policy
gmass.co
Support
gmass.co
Extension ID
ehomdgjhgmbidokdgicgmdiedadncbgf

Permissions and risk

Minimal riskimpact 1, likelihood 0

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