About GMass
Overview
GMass turns Gmail into a full email campaign platform. It sends newsletters, announcements, cold email campaigns, and transactional email directly from inside Gmail, using the compose window users already know. More than 400,000 people and companies, including Uber, have used GMass to reach audiences ranging from 50 to 50 million recipients.
Founder Ajay Goel built GMass to remove the setup work typical email platforms require. Beyond the Chrome extension, GMass offers an SMTP relay, an API, webhooks, and Google Sheets integration so teams can connect it to existing tools and workflows.
Key Benefits
- Send every email type from one place: newsletters, announcements, cold email, and transactional messages in Gmail.
- Personalize each message with mail merge fields pulled straight from a Google Sheet.
- Build unlimited automatic follow-up stages for onboarding, sales, and outreach sequences.
- Track opens and clicks with cleaner analytics that filter out bot opens.
- Scale delivery from native Gmail to inbox rotation and SMTP as your audience grows.
- Apply AI tools like SpinMax, the AI template builder, and Deep Analysis to improve campaigns.
How It Works
Users install the GMass Chrome extension and compose a message in Gmail as they normally would. Instead of Gmail's Send button, they click the GMass button and choose a Google Sheet where each row becomes a recipient and each column becomes a merge field. GMass delivers the campaign through the connected Gmail account, then automatically shifts to inbox rotation and SMTP as recipient counts rise.
Use Cases
- Marketers send newsletters and product announcements to large subscriber lists from Gmail.
- Sales teams run cold email campaigns with personalized merge fields and multi-stage follow-ups.
- Startups deliver password resets, receipts, and login codes through the GMass SMTP relay.
- Teachers and schools email parents with per-student personalized updates.
- Onboarding teams build long-form educational sequences with unlimited follow-up stages.
- Agencies monitor opens, clicks, and replies for clients using cleaner analytics.
Why Choose This Product
GMass positions itself as a step up from typical email platforms, with clearer dashboards, more accurate analytics, a first send in under 60 seconds, and lower cost. The company is upfront that its full settings panel is not a step-by-step wizard, so users who want a guided setup may find the learning curve steeper. Deliverability is treated as a shared responsibility: GMass monitors SPF and offers the Spam Solver, while users control their list quality and sender reputation.
GMass Pros & Cons
- Works entirely inside Gmail using the familiar compose window
- All plans include unlimited emails, contacts, and campaigns
- Free email address verification and custom SSL tracking links on every plan
- AI tools for writing, spintax, and deliverability suggestions
- Rated 4.8 on Chrome Web Store and 4.7 on G2
- Full settings panel appears all at once rather than as a step-by-step wizard
- Requires a Gmail or Google Workspace account and the Chrome browser
- High-priority support is limited to Professional plans
Key Features
Mail merge personalization
All plansEach Google Sheets column becomes a merge field that personalizes names, companies, dates, and URLs inside every email.
Auto follow-up sequences
All plansBuild unlimited automatic follow-up stages, even a 100-stage onboarding sequence, that send until a recipient replies.
Spam Solver
All plansAI-powered suggestions help you iterate on your email and settings until the message reaches the inbox.
API and Zapier
Premium+Connect GMass to your stack through its API, webhooks, Zapier integration, and the Sheets API.
A/B testing
Premium+Test subject lines and message variations to improve open and reply performance.
Triggered emails
Premium+Send emails instantly when a prospect reaches their inbox or another defined condition is met.
Inbox Rotation
Premium+Spread large campaigns across multiple Gmail accounts to avoid hitting daily sending limits.
Transactional SMTP
Send password resets, receipts, and login codes from your own app through the smtp.gmass.co relay.
AI content tools
SpinMax generates unique wording variations for each recipient, and the AI template builder creates custom HTML layouts.
GMass Pricing
View full pricing →- Works inside Gmail
- Send unlimited emails
- Unlimited contacts and campaigns
- Mail merge personalization
- Free email address verification
- Custom tracking links with SSL
- Spam Solver
- Sequences and follow-ups
- Everything in Standard
- API access plus Zapier
- A/B testing
- Triggered emails
- Inbox Rotation (MultiSend)
- Everything in Premium
- High-priority support
- Email support
- Team plan for 5 users
- Everything in Premium
- Email support
| Feature | Standard $29.95/mo | Premium $39.95/mo | Professional $59.95/mo | Team Premium $175/mo |
|---|---|---|---|---|
| Mail merge personalization | ||||
| Auto follow-up sequences | ||||
| Spam Solver | ||||
| API and Zapier | ||||
| A/B testing | ||||
| Triggered emails | ||||
| Inbox Rotation |
Pricing extracted from the product website and may change. Check the source for current details.
Frequently asked questions about GMass
What do I need in order to use GMass?
You need a Gmail or Google Workspace (G Suite) account and the Chrome browser. GMass runs inside Gmail, so the extension is installed in Chrome and sends campaigns through your connected Google account.
Is GMass free?
GMass is a paid product. See the pricing section for current plans and starting prices.
How much does GMass cost?
GMass offers the following plans: Standard, Premium, Professional, Team Premium. See the pricing section for what's included in each tier and any per-seat or usage-based costs.
What platforms does GMass support?
GMass is available on: Web.