Gmass
GMass is a Gmail extension built for cold outreach and email marketing campaigns.
Updated April 2026
Overview: What is Gmass?
It connects with Google Sheets to personalize messages at scale. Teams use it to bypass standard Gmail sending limits while tracking results.
GMass converts a standard Gmail account into a platform capable of sending high-volume email campaigns. Users build recipient lists directly from Google Sheets, then compose and send personalized messages from the familiar Gmail interface. The tool handles automated follow-up sequences based on whether recipients opened or replied to earlier messages. Built-in list verification helps reduce bounce rates and avoid spam filters. Campaign analytics provide open, click, and reply tracking without leaving the inbox. It serves as a lightweight alternative to complex marketing automation platforms for teams that live inside Gmail.
Fit: Ideal customer profile.
Startups, small businesses, and agencies that need a simple way to run personalized cold email campaigns from Gmail.
- Seed
- SMB
- Mid-market
Capabilities
Key features.
01
Sends mass emails from Gmail
02
Mail merge via Google Sheets
03
Automated follow-up sequences
04
Bypasses standard Gmail sending limits
05
Built-in email list verification
06
Open, click, and reply tracking
07
Spam filter testing tools
08
API access and Zapier integration
09
Inbox rotation for deliverability
Usage
How to use Gmass.
Install the browser extension and connect it to a Gmail account. Build a recipient list in Google Sheets, link it to a new compose window, and write the message with personalization variables. Set follow-up rules, then hit send to launch the sequence.
Cost
Pricing.
$18/ Per seat
Starts at $18 per user per month for the Standard plan. No free trial is available.
Standard
$18.00
- Unlimited emails
- Unlimited contacts
- Free email verification
- API access + Zapier
- Inbox rotation
- Email support
Premium
$27.00
- Unlimited emails
- Unlimited contacts
- Free email verification
- API access + Zapier
- Inbox rotation
- Email support
Professional
$43.00
- Unlimited emails
- Unlimited contacts
- Free email verification
- API access + Zapier
- Inbox rotation
- Email support
At a glance
Quick facts.
- Stack position
- Outbound Sending
- Category
- AI Agents, Sales Tools
- Best for
- Seed, SMB, Mid-market
- Pricing
- From $18/Per seat
Subcategories
- Cold Outreach AI Agents
- Email Automation AI Agents
- Email Sender
- Email Spam Tester
Follow Gmass
Questions
Frequently asked.
How do you set up a campaign in GMass?
Open Gmail, click compose, and connect a Google Sheets list. Add your subject line, message body with personalization tags, and send.
What does GMass cost per month?
Plans start at $18 per user monthly for Standard, $27 for Premium, and $43 for Professional. Annual billing is available for all tiers.
Why should teams pick GMass over other email tools?
It runs entirely inside Gmail, which removes the need to learn a separate platform. Unlimited emails, automatic follow-ups, and built-in verification come standard.
How does GMass send personalized emails at scale?
It pulls contact data from a linked Google Sheet and merges those fields into each message. Follow-ups and analytics run automatically after the initial send.
Is there a free version of GMass?
A free trial lets users test core features with limited volume. Full access to unlimited sending and advanced features requires a paid plan.
Does GMass offer a partner or reseller program?
The company provides API access and Zapier integrations for connecting to other tools. No public information exists about a formal partner or reseller program.
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