Chrome extension that sends mass email, mail merge, and cold email campaigns directly from Gmail, pulling personalization data from Google Sheets. Includes automatic follow-ups, A/B testing, open/click/reply tracking, and a REST API with webhooks.
At a glance
- Free tier
- No free plan; free trial capped at 50 emails/day
- Paid from
- $20/mo (Standard, billed annually; $29.95 monthly) · pricing page
- Public API
- Yes docs
- MCP server
- Community · No official vendor MCP; third-party server via viaSocket
- Best for
- Cold email outreach and mass email inside Gmail
- Website
- https://www.gmass.co
GMass pricing
No free plan; free trial capped at 50 emails/day. Paid plans start at $20/mo (Standard, billed annually; $29.95 monthly). Current numbers live on the GMass pricing page.
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How GMass compares
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