GMass

GMass turns Gmail into a cold email and mail merge tool. It runs inside your Gmail account, so you write and send campaigns from the inbox you already use, which makes it a favourite of founders, freelancers and small teams.

Every plan includes unlimited emails and contacts, mail merge personalization, free email verification, custom tracking links and Spam Solver, which helps diagnose deliverability problems. The Premium plan adds automated sequences and follow-ups, A/B testing, triggered emails, API access and Zapier, and Professional adds inbox rotation, called MultiSend, so you can spread sending across several accounts, plus high-priority support. Team plans cover groups from five to more than 100 users.

Because it works inside Gmail, there is little to learn, and campaigns can be built from a Google Sheet.

Standard costs $29.95 a month, or $249 a year, Premium $39.95 a month and Professional $59.95 a month, with annual billing saving about 30%. Prices rose in January 2026. There is a 7-day free trial with no credit card.