Top Chrome Extensions for Gmail Mail Merge
Gmail Mail Merge Chrome extensions — 9K monthly searches · Rankings shifted 46× in 7 days · Top 3 locked — dominated by incumbents
What Developers Can Learn
Intelligence derived from tracked keywords across all Gmail Mail Merge sub-keywords
Most Congested
GMass dominates with 400K users and a 4.8 rating, commanding over 90% market share in this niche.
The runner-up Streak has only 10K users despite matching GMass's 4.8 rating, revealing how entrenched the leader is.
One competitor's 2.7 rating shows low quality can persist but cannot compete at scale.
Possible Openings
Adjacent keywords like 'Email Tracking Gmail' (14.8K), 'Gmail Email Tracker' (14.3K), and 'Email Tracking In Gmail' (14.1K) all have higher search volumes than the primary keyword with likely less dominant incumbents.
Positioning Patterns
Top performers blend 'Mail Merge' branding with 'Gmail' association.
GMass uses 'Powerful' in its title; Streak emphasizes professional-grade tooling.
All top-rated extensions maintain 4.8+ ratings, setting a high quality bar for new entrants.
Top Extensions Leaderboard
7-day ranking snapshot and appearances in Top 10
| # | Extension | Users | Rating | Appearances | Category | Momentum |
|---|---|---|---|---|---|---|
| 1 |  Mail Merge for Gmail | 10,000+ | ⭐ 2.7 | 7/7d | Gmail | — stable |
| 2 |  GMass: Powerful mail merge for Gmail | 400,000+ | ⭐ 4.8 | 7/7d | Gmail | — stable |
| 3 |  Streak Mail Merge for Gmail | 10,000+ | ⭐ 4.8 | 7/7d | Gmail | — stable |
| 4 |  Salesforza Gmail Mail Merge & CRM on GSheets | 823 | ⭐ 4.6 | 7/7d | Gmail | — stable |
| 5 |  MergeMail | 30,000+ | ⭐ 4.9 | 7/7d | Gmail | — stable |
| 6 |  MassMerge: Latest mail merge for Gmail | 356 | ⭐ 4.6 | 7/7d | Gmail | — stable |
| 7 |  FullMail: Smart Mail Merge Inside Gmail | 21 | ⭐ 0 | 6/7d | Gmail | — stable |
| 8 |  Mailflame for Gmail: Mail merge, Send & Track emails | 138 | ⭐ 4.4 | 7/7d | Gmail | — stable |
| 9 |  MailFlow Pro: Mail Merge Gmail Outlook | 82 | ⭐ 5 | 7/7d | Gmail | ↑ rising |
| 10 |  Send Mass Mail + HTML inserter for Gmail | 8,000+ | ⭐ 4.7 | 6/7d | Gmail | — stable |
Mail Merge for Gmail
10,000+ · ⭐ 2.7 · 7/7d
GMass: Powerful mail merge for Gmail
400,000+ · ⭐ 4.8 · 7/7d
Streak Mail Merge for Gmail
10,000+ · ⭐ 4.8 · 7/7d
Salesforza Gmail Mail Merge & CRM on GSheets
823 · ⭐ 4.6 · 7/7d
MergeMail
30,000+ · ⭐ 4.9 · 7/7d
MassMerge: Latest mail merge for Gmail
356 · ⭐ 4.6 · 7/7d
FullMail: Smart Mail Merge Inside Gmail
21 · ⭐ 0 · 6/7d
Mailflame for Gmail: Mail merge, Send & Track emails
138 · ⭐ 4.4 · 7/7d
MailFlow Pro: Mail Merge Gmail Outlook
82 · ⭐ 5 · 7/7d
Send Mass Mail + HTML inserter for Gmail
8,000+ · ⭐ 4.7 · 6/7d
Ranking Volatility - Top 10 Ranks
7-day Top 10 movement snapshot (2026-05-12 to 2026-05-18)
✦ Entered Top 10 This Week
↓ Dropped Out of Top 10
Data Methodology
- Data source:
- Chrome Web Store search results
- Update frequency:
- Weekly
- Monthly Search Demand:
- Estimated demand indicator sourced from third-party keyword data. Not CWS-internal figures.
Is your extension visible
in Gmail Mail Merge extension market?
Track your extension's ranking for any Gmail Mail Merge keyword, monitor weekly changes, and find the exact gaps between you and the top 10.