Compare: Send Mass Mail + HTML inserter for Gmail vs GMass: Powerful mail merge for Gmail

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Metric	Send Mass Mail + HTML inserter for Gmail	GMass: Powerful mail merge for Gmail
User count	7,000	400,000
Average rating	4.74	4.78
Rating count	38	9,154
Last updated	2025-10-07	2026-06-30
Size	0.58 MB	0.30 MB
Version	2.2.3	6.0.43

Short description	Create personalized Gmail campaigns, send thousands privately, use an AI assistant for replies, track opens, and import Google Sheets for mail merge.	GMass transforms Gmail into a powerful mass email and mail merge platform with personalized campaigns, follow-ups, and superior deliverability.
Full summary	Send Mass Mail + HTML Inserter for Gmail lets you compose and send personalized email campaigns directly from Gmail. Install the Chrome extension, write your message, select a list, and send mass emails as undisclosed recipients so each recipient sees a one-to-one message. Import contacts from Google Sheets, merge data fields, and scale outreach with dynamic personalization. Built-in AI assists with generating replies, follow-ups, and consistent tone across messages. All campaigns are stored in a Campaigns panel where you can track deliveries, queues, and open rates, then export statistics as PDF, CSV, or TXT. Ideal for sales, support, and outreach teams who want Gmail familiarity with advanced mass-mailing, tracking, and AI-powered productivity.	GMass is a robust Chrome extension that turns Gmail into an advanced platform for cold outreach, email marketing, and mail merges. With features like personalized mail merges using Google Sheets data, inbox rotation for sending campaigns across multiple accounts, and high deliverability rates, it helps users send thousands of customized emails efficiently. GMass includes automation options such as triggered emails, auto follow-ups, and recurring campaigns, enhanced by integrations with CRM platforms and Zapier. Safety and spam management are core strengths, with built-in spam testing, free email verification, DKIM support, and bounce/unsubscribe handling. Users benefit from sophisticated campaign tracking—monitoring opens, clicks, replies, and bounces in real-time. Additional utilities include A/B testing, scheduling, email personalization with images and attachments, spintax, countdown timers, quick polls, and seamless compatibility with Grammarly for flawless emails. Used by nearly 400,000 users with a 4.8-star average rating, GMass offers a comprehensive email marketing solution directly within Gmail without needing an external portal.