GMass is a Chrome extension that turns Gmail into a mail-merge and cold-email tool: you write in Gmail's compose window, point it at a Google Sheet, and GMass sends personalised emails with automatic follow-ups from your own account. It was founded in 2014 by Ajay Goel (Latka).
The surprising fact: by third-party estimate it is about as large as Woodpecker or Hunter with a fraction of the staff. Latka estimates $8.6M revenue in 2024, up from $5.4M in 2023, with 11 employees as of December 2024 — not company-disclosed.
What it sells
- Mail merge in Gmail — personalisation from Google Sheets, unlimited emails, contacts and campaigns on all plans (pricing, Oct 2026).
- Sequences — automatic follow-ups, A/B testing, triggered emails and API access on Premium and above.
- Deliverability helpers — email verification, custom tracking domains, a "spam solver". See Custom tracking domains and Content and tracking.
- Inbox rotation — on the Professional plan only. See Inbox rotation.
How it prices
| Plan (as of Oct 2026) | Monthly | Annual (per mo) | Adds |
|---|---|---|---|
| Standard | $29.95 | $20 ($249/yr) | Mail merge, verification, tracking links, spam solver |
| Premium | $39.95 | $29 ($349/yr) | Sequences, API, A/B tests, triggers |
| Professional | $59.95 | $49 ($599/yr) | Inbox rotation, priority support |
| Team plans | Scaled by 5–100+ users | Same features |
Source: gmass.co/pricing. "All plans include unlimited emails" — the real limit is Gmail's own Sending limits and throttling per account.
Its customer sends from the Gmail account they already have. Rotation exists on the top tier, but the product is built for one human with one inbox. The buyer is not in the volume market at all.
Who uses it and why
Solo founders, consultants and small teams who already live in Gmail and want mail merge plus follow-ups without learning a new tool or buying domains (Founders and small B2B teams). Because the Standard plan is plain mail merge, part of the base is not doing cold outreach at all but personalised sends to lists they already own.
Where it is strong
- Zero setup. No new domains, mailboxes or warm-up; it works inside a tool the user already trusts.
- Price. $20/month annual for unlimited sends is the lowest entry point in this section.
- Founder-run efficiency. If Latka's estimate is near the truth, revenue per employee is among the highest in the category.
Where it is weak
- Gmail-only. No Outlook-native equivalent, which shuts out Microsoft 365 shops.
- Exposed to Google. It depends on Gmail APIs, Chrome extension policies and Google's sender rules; tighter bulk-sender rules (Google and Yahoo sender rules) and OAuth scope reviews (OAuth verification and the end of basic auth) hit it directly.
- Not built for scale. No unified inbox for dozens of mailboxes, no agency workspaces. See Unified inbox (Unibox).
No review-site ratings, customer counts or confirmed revenue were collected. Latka's 200,000 "customers" figure is unverified and likely counts users, not paying accounts.
Trajectory
Stable. The pricing and features in October 2026 show incremental additions (rotation, API, triggers), not a pivot. There is no sign of funding, acquisition or an AI-agent push.
What this means for an entrant
- "Send from the inbox you already have" is a real segment. Many small users will never buy 50 mailboxes. A product that serves them cheaply — and in Outlook as well as Gmail — sits outside the Instantly fight.
- Platform risk is the price of zero setup. Anything living inside Gmail lives on Google's terms. See Provider rules: Google, Microsoft and the ESPs and Platform liability: what the sequencer itself risks.
- Small teams can run large books. GMass (and Hunter) show $8M-scale revenue with roughly a dozen to thirty people. Plan your cost base accordingly — see Build costs and team.
- An EU, Outlook-first variant is untested. Microsoft 365 is widely used by European SMBs; nobody in this section owns "GMass for Outlook". Verify demand before building.