Mergeline vs GMass

Q: Does GMass have a free plan?

No. GMass ended its free plan on December 21, 2023. It offers a 7-day trial with 50 emails per rolling 24 hours.

Mergeline and GMass both send mail merge campaigns from Gmail. GMass is built for volume: it can send past Gmail’s limits, tracks opens and clicks, and starts at $29.95 a month. Mergeline is built for personal sends: 60 emails a day free, follow-ups for $99 a year, no tracking pixels and no server in the path.

Updated October 29, 2026. Facts about other tools come from their own pages and public reviews, read on October 29, 2026 and listed under Sources. Mergeline is our product.

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How do Mergeline and GMass compare, feature by feature?

Mergeline vs GMass, checked October 29, 2026
	Mergeline	GMass
What it is	Chrome extension that sends through your own Gmail tab	Chrome extension for Gmail, with sending and tracking through GMass servers
Free plan	60 emails a day, no time limit, no branding added	No free plan. A 7-day trial with 50 emails per rolling 24 hours¹
Monthly billing	Pro $12 a month	Standard $29.95, Premium $39.95, Professional $59.95¹
Yearly billing	Pro $99 a year (about $8.25 a month)	Standard $249, Premium $349, Professional $599 a year¹
Daily sending	Free 60; Pro up to Gmail’s own daily limit	“Send unlimited emails” on paid plans, with a footnote that going past limits depends on your account set-up¹
Follow-ups	Up to 7 on Pro, in the same thread, stopping for anyone who replies	Premium and up, with unlimited automatic follow-up stages¹
Tracking pixels	None added: no tracking pixels and no link redirects	Open and click tracking, with custom tracking links on all plans¹
Where your data lives	In your browser. No Mergeline server receives your lists, emails or replies	Recipient addresses stored in the GMass database; email content passes through its server²
Google permissions	No Google account permissions by default. Optional Google sign-in asks for gmail.send, plus gmail.readonly only if you turn on reply detection	Gmail access that Google’s consent screen describes as “read and manage” your email³
Attachments	Yes, on Pro	Not published
Scheduling	Yes, on Pro: start time and sending hours	Not published
A/B tests	Yes, on Pro: two subject lines	Premium and up¹
Google Sheets	Yes: paste a Sheets link. Pro adds new rows automatically	Yes, with optional Google Sheets access³

“Not published” means the vendor pages we read on October 29, 2026 did not state it. The feature or price may still exist, so check the vendor’s site.

What is the main difference between Mergeline and GMass?

Both tools live in Gmail as Chrome extensions, but they send differently. GMass sends through its own servers and your Gmail account, and inserts tracking on the way; its privacy post says email content passes through its server². On paid plans it uses SMTP to go past Gmail’s daily limits, which GMass says depends on your account set-up¹.

Mergeline has no sending server. It fills Gmail’s own compose window in your Gmail tab, one email at a time, with random gaps of 45 to 120 seconds by default. Each email lands in your Sent folder like one you typed. The trade-off is that your browser must stay open while a campaign runs, and Mergeline never sends more than Gmail itself allows: about 500 a day on a personal account and 2,000 on Workspace⁴⁵.

How much do Mergeline and GMass cost per year?

Monthly billing: Mergeline Pro costs $12. GMass Standard costs $29.95, Premium $39.95 and Professional $59.95¹. Over a year of monthly billing, that is $144 for Mergeline Pro and $479.40 for GMass Premium.

Yearly billing: Mergeline Pro costs $99. GMass costs $249, $349 and $599¹. Follow-ups and A/B tests start on GMass Premium, so the like-for-like price is $99 against $349 a year.

Free: Mergeline’s free plan sends 60 emails a day with no time limit. GMass has no free plan since December 21, 2023⁶, only a 7-day trial with 50 emails per rolling 24 hours¹.

Which one is more private?

GMass’s privacy post says it stores recipient addresses in its database for opens, clicks and unsubscribes, that email content passes through its server, and that list information may be shared with ad platforms such as Google for targeted advertising². Its FAQ notes Google’s consent screen says GMass can “read and manage” your email³.

Mergeline stores your lists, emails, results and do-not-email list in your browser’s extension storage. In its default mode it asks for no Google account permissions: it fills Gmail’s own compose window in your Gmail tab. If you choose Google sign-in instead, it asks for gmail.send, which Google classes as sensitive rather than restricted, and for gmail.readonly only if you turn on reply detection⁷. That data is used in your browser and never sent to a Mergeline server. The full breakdown is on our security page.

Which one should you choose?

Choose GMass if

You send more than 2,000 emails a day, or need to go past Gmail’s limits.
You rely on open and click reports.
You run campaigns for a team of 5 to 100 people.
You want unlimited follow-up stages and A/B tests on one plan.

Choose Mergeline if

You send tens or a few hundred personal emails a day.
You want a free plan of 60 emails a day that never expires.
You want up to 7 follow-ups for $99 a year.
You do not want a tracking pixel in your emails or your list on someone else’s server.

Still deciding? See the best GMass alternatives, or compare every tool’s price on the mail merge pricing page.

Questions people ask

Is Mergeline cheaper than GMass?

Yes. Mergeline Pro is $12 a month or $99 a year. GMass starts at $29.95 a month or $249 a year, and its first plan with follow-ups costs $349 a year¹.

Does GMass have a free plan?

No. GMass ended its free plan on December 21, 2023⁶. It offers a 7-day trial with 50 emails per rolling 24 hours¹.

Which is better for deliverability, GMass or Mergeline?

Neither tool can promise the inbox. Google asks senders to keep their spam rate under 0.3% and ideally below 0.1%⁸. Mergeline helps by sending plain emails with no pixels or link redirects, at a human pace, and by pausing when too many addresses bounce.

Does Mergeline have A/B tests like GMass?

Yes, on Pro: split your list between two subject lines and see which earns more replies. GMass includes A/B tests from Premium¹.

Can I bring my GMass Google Sheet to Mergeline?

Yes. Paste the sheet’s link and each column becomes a merge tag. Remove people who unsubscribed in GMass first.

Sources

GMass pricinghttps://www.gmass.co/pricing, checked October 29, 2026
GMass: what data does our server storehttps://www.gmass.co/blog/gmass-privacy-information-what-data-does-our-server-store/, checked October 29, 2026
GMass FAQhttps://www.gmass.co/faq, checked October 29, 2026
Gmail Help: limits for sending emailhttps://support.google.com/mail/answer/22839, checked October 29, 2026
Google Workspace Admin Help: Gmail sending limitshttps://knowledge.workspace.google.com/admin/gmail/gmail-sending-limits-in-google-workspace, checked October 29, 2026
GMass price changes, January 2024https://www.gmass.co/blog/price-changes-jan-2024/, checked October 29, 2026
Gmail API: choose Gmail API scopeshttps://developers.google.com/workspace/gmail/api/auth/scopes, checked October 29, 2026
Gmail Help: email sender guidelineshttps://support.google.com/mail/answer/81126, checked October 29, 2026

Try Mergeline free in Gmail

60 emails a day free, with no card and no branding. Pro is $12 a month or $99 a year, with up to 7 follow-ups that stop on reply.

Add to Chrome

Gmail is a trademark of Google LLC. GMass is a trademark of its owner. Mergeline is not affiliated with, endorsed by or sponsored by Google or any other company named on this page.