GMass

GMass is a Chrome extension that turns Gmail into an email marketing and mail merge platform for sending newsletters, cold email campaigns and automated follow-ups from your own Gmail account.

Email Marketing # email-marketing# gmail# mail-merge# cold-email# chrome-extension# email-automation

Quick Facts

Pricing Model

Paid

Pricing Options

Monthly

$29.95 /mo

Yearly

$249 /yr

$20.75/mo billed yearly, save 31%

Key Features

→ Mail merge inside Gmail with personalization from Google Sheets
→ Unlimited emails, contacts and campaigns on every plan
→ Automated sequences and follow-ups
→ Open and click tracking with custom SSL tracking domains
→ Free email address verification and a Spam Solver
→ A/B testing, triggered emails and inbox rotation (MultiSend) on higher plans
→ API access and Zapier integration
→ Deliverability tools: inbox placement tester, SMTP tester and email verifier

Pros

Works entirely inside Gmail, so there is no separate app to learn
No per-contact or per-email caps on any plan
Very large user base, with a 4.8 rating from about 9.2K Chrome Web Store reviews
Strong built-in deliverability tooling for cold email

Cons

Tied to Gmail and Google Workspace accounts only
API access, A/B testing and triggered emails need the Premium plan or higher
High-volume sending can still get Gmail accounts restricted
Trustpilot reviews are mixed, with billing and support complaints

Technical Performance

Lighthouse Audit

Speed

74/100 C

Accessibility

85/100 B

Best Practices

54/100 D

SEO

100/100 A

Core Web Vitals

LCP 3.1s

FCP 2.7s

CLS 0.000

TBT 542ms

Speed Index 3.9s

Performance data measured via Google Lighthouse. Fast load times indicate a well-optimized product that won't slow down your workflow.

User Reviews

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