GMass is a Gmail-based mail merge and cold email tool that runs entirely inside your existing Gmail or Google Workspace account. Instead of moving you to a separate sending platform, GMass adds powerful campaign features — personalisation tokens, automatic follow-ups, scheduling, list building from search, and reporting — directly into the Gmail Compose window via a Chrome extension.
This Gmail-native approach is why GMass has become a favourite among solopreneurs, recruiters, salespeople, and agencies running outbound campaigns. You get the deliverability of your own Google account, native reply handling in your inbox, and a familiar interface — without learning a separate SaaS app.
Personalise hundreds or thousands of emails with merge tags pulled from a Google Sheet — first name, company, role, custom fields — without leaving the Gmail Compose window.
Set up to eight conditional follow-ups based on no-reply, no-open, or no-click triggers. Sequences pause automatically when a prospect replies.
Connect any Google Sheet as your mailing list. Updates to the sheet are reflected on the next send — perfect for dynamic CRM exports.
Build a campaign list straight from a Gmail search query — e.g. send to every person who has emailed you in the last 90 days that contains a specific keyword.
Trigger a new campaign automatically when a recipient opens, clicks, or replies — turning Gmail into a lightweight outbound marketing engine.
GMass detects human replies and automatically removes recipients from follow-up sequences so you do not annoy interested prospects.
Built-in deliverability suite includes a free inbox placement test, spam score checker, and email warming via GMass Reverse to keep cold campaigns landing in primary inboxes.
Track opens, clicks, replies, bounces, and unsubscribes per campaign or per recipient, with a unified dashboard inside Gmail and exportable reports.
GMass packs a full cold-email and mail-merge stack into a Chrome extension that lives inside Gmail. Beyond basic personalisation, you get automatic follow-ups, Google Sheets connectors, behaviour-based campaigns, list building from Gmail search, deliverability tools, A/B testing, and detailed open/click/reply analytics. Paid tiers add advanced reporting, team accounts, and SMTP options for high-volume senders.
Hand-picked walkthroughs from independent reviewers and the official GMass channel covering setup, campaigns, follow-ups, and Gmail-based deliverability.
GMass is built around a handful of high-impact email workflows. Below are the most common use cases that drive its adoption.
GMass offers a free tier plus paid plans for individuals and team pricing, all run inside Gmail. Because GMass updates its plan pricing periodically, please check the official gmass.co/pricing page for the current monthly and annual rates in your region.
Up to 50 emails per day, basic mail merge, and limited tracking — enough to evaluate the workflow inside Gmail.
Unlimited sends (subject to Gmail’s own daily limits), basic auto follow-ups, basic reports, and Gmail support. Best for individual users testing outbound.
Adds advanced behaviour-based campaigns, sequence pausing, reply detection, and detailed analytics. Recommended tier for active cold-email senders and recruiters.
Adds priority support, custom tracking domains, A/B testing, premium deliverability tools, and unlimited sequences — built for high-volume professional senders.
Custom pricing — contact sales. Volume discounts, shared templates, central billing, and team-level reporting for agencies and sales teams.
On G2, GMass holds a 4.7/5 average across 800+ reviews, with users repeatedly praising the simplicity of running mail merges directly inside Gmail (source: G2.com/products/gmass). Capterra reviewers (4.8/5 average, 1,000+ reviews) highlight the speed of campaign setup and the responsive support team. The most common critique across review sites is that the analytics dashboard, while functional, feels dated compared to dedicated outbound platforms.
I was already living in Gmail every day, so moving outbound into a separate tool felt like overkill. GMass lets me run 200–300-email campaigns straight from Compose, with proper follow-ups and reply detection. Setup took an afternoon and we never went back to our previous outreach platform.
For candidate outreach the Google Sheets integration is the killer feature. I keep my pipeline in a Sheet, GMass pulls names, roles, and personalised intros automatically, and replies land in the same inbox I already use. Premium plan paid for itself in the first week.
Strong tool with one of the best free tiers around. The analytics dashboard is a bit utilitarian — I would love charts that go deeper — but deliverability has been excellent on our cold campaigns, and the inbox placement test is a really nice touch.
If GMass isn’t quite the right fit, these alternatives are worth comparing depending on your sending volume and team setup:
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Common questions before signing up for GMass.
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