Outsolvi vs GMass: the best GMass alternative in 2026
Updated May 23, 2026
Quick answer
Outsolvi and GMass serve different sales motions. GMass is a Gmail-only mail merge platform optimized for cold-email volume (priced $25 to $95 per user per month), with auto-follow-up campaigns and email list management built around mass send. Outsolvi is an email tracking and AI follow-up tool at $7 per user per month billed yearly ($12 monthly), native in Outlook and Gmail, with Tier 1 to 5 confidence scoring that filters MPP and bot opens, and AI follow-up signals at the base tier. GMass is built for SDR cold-blast volume; Outsolvi is built for AE relationship selling.
GMass is a Gmail-native mail merge tool. Send thousands of emails from a Google Sheet, auto-follow-up to non-openers, manage bounces and unsubscribes, track opens and clicks. Founded in 2015, it has matured into one of the more popular Gmail-based cold-email tools, with a user base that skews heavily toward agencies, recruiters, and SDR teams running outbound at volume.
The core trade-off with GMass is the same as Saleshandy's: it is built for high-volume cold blasts, not for relationship selling. The product optimizes for getting thousands of emails out the door reliably, with mail-merge personalization and follow-up cadences as the load-bearing features. It is not optimized for individual prospect tracking accuracy or AI-driven engagement intelligence.
The platform constraint is also Gmail-only. GMass has no Outlook version. For teams with mixed inboxes or any Outlook usage, the tool does not work. Pricing starts at $25 per user per month for Standard and climbs to $95 for Enterprise, with most paying users on Premium ($35) for the deliverability features.
GMass is a Gmail-only mail merge platform built for high-volume cold email, priced from $25 to $95 per user per month. Outsolvi is a focused tracking and AI follow-up tool at $7 per user per month yearly, native in both Outlook and Gmail. If your team runs cold-blast outbound at thousands of emails per month from Gmail, GMass is built for that motion and Outsolvi is not. If your team does relationship selling at 100 to 300 emails per week across Outlook and Gmail with tracking accuracy as the load-bearing need, Outsolvi is the structurally different answer.
How Outsolvi compares to GMass (feature by feature)
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Install Outsolvi for Outlook or Gmail, send your next email, and see who opened it. from $7/mo once your trial ends.
Why teams choose Outsolvi
Outsolvi is built for the motion GMass explicitly is not: AE relationship selling, one-to-one tracking, multi-inbox support, accuracy-first engagement signals. The product runs natively in both Outlook (Desktop, Web, New Outlook) and Gmail with one unified dashboard. Tier 1 to 5 confidence scoring excludes Apple Mail Privacy Protection and bot opens from the count, with a 3-minute dedup window on Gmail-proxy traffic. AI follow-up signals and reply sentiment analysis are included at the $7 yearly tier, where GMass requires manual configuration of follow-up cascades against the cold-blast pattern. Where GMass optimizes for getting thousands of emails out reliably, Outsolvi optimizes for the engagement signal quality on the individual prospects that matter to pipeline. Different motions, structurally different tools.
Where GMass excels
GMass is genuinely mature in cold-email-from-Google-Sheets tooling. The mail merge feature is one of the most polished in the category, with strong personalization tokens and merge variables. The auto-follow-up-to-non-openers cadence works at scale. The email list management (bounce handling, unsubscribe management, suppression lists) is production-grade. For agencies sending thousands of personalized emails per week from Gmail, GMass at $25 to $35 per user per month is competitive against the rest of the cold-email category (Saleshandy, Lemlist, Instantly, Smartlead).
Which is right for your team
Honest framing of who each tool fits best. Not every team is the same buyer.
Agency or SDR team running cold-email at high volume on Gmail
Sending 500 to 2000 personalized emails per rep per week from Google Sheets, follow-up cadences to non-openers, bounce management, suppression lists. The team has accepted the deliverability tradeoffs of cold-volume outbound.
GMass. This is exactly what the tool is built for, and the mail merge + list management is genuinely good. Outsolvi is not a cold-volume platform.
AE team doing relationship selling at 100 to 200 emails per week, mixed Outlook plus Gmail
Individual prospect tracking, follow-up timing based on engagement signals, mixed-inbox team. Open rate is supposed to drive follow-up decisions, but the current tracker's numbers look inflated against the reply rate.
Outsolvi. GMass's Gmail-only constraint and cold-blast optimization are both wrong for this motion. Outsolvi is the structurally different answer.
Team that started on GMass for cold outbound and shifted to ABM relationship selling
The motion changed: from thousands of cold emails per week to a few dozen highly-personalized ones per week to target accounts. The team still pays for GMass out of habit but only uses tracking.
Outsolvi. The cold-blast features GMass charges for are unused in an ABM motion. Outsolvi at $7 yearly versus GMass at $25 Standard saves ~$216 per rep per year and matches the new motion better.
Switching from GMass to Outsolvi
What to expect, in order. The 14-day Outsolvi trial covers the whole switch.
Day 0 (before you cancel)
Export your GMass campaign history, suppression lists, and mail merge templates. If your team relies on GMass for high-volume cold outbound, decide whether you are switching motions (ABM, relationship selling) or just switching cold-blast tools (Saleshandy, Lemlist, Instantly). Outsolvi is the right answer for the first case, not the second.
Day 1
Install Outsolvi's Gmail Chrome extension (or Outlook add-in from Microsoft AppSource for the Outlook half of the team). Sign in. Send your next prospect emails individually rather than as a mail merge campaign. Tracking starts on first send.
Day 7
Compare engagement numbers. Open rates will look different because Outsolvi filters Tier 4 and 5 (MPP, scanners). Reply rate is the cleaner signal. The AI follow-up signals at the Outsolvi base tier replace the manual auto-follow-up cadences GMass ran for non-openers.
Day 30
Cancel GMass. If your motion has genuinely shifted to relationship selling, Outsolvi covers the load-bearing tracking and follow-up intelligence. If the team still needs occasional mail-merge campaigns at volume, plan on keeping a separate cold-email tool for those use cases.
Frequently asked questions
Is Outsolvi a mail merge tool like GMass?+
No. Outsolvi is an email tracking and AI follow-up tool, not a mail merge platform. Outsolvi supports email sequences with personalization tokens for one-to-one follow-up automation, but the workflow is not optimized for mass-blast from a Google Sheet. If CSV-driven mail merge at thousands of emails per week is the load-bearing feature your team needs, GMass or one of its peers (Saleshandy, Lemlist, Instantly) is the right shape.
Why is GMass Gmail-only?+
GMass was built native to Gmail in 2015 and has stayed that way by design. The deep integration with Google Sheets for mail merge and the Gmail compose surface are core to how the product works. There is no announced Outlook version or roadmap. For mixed-inbox teams, GMass does not work for the Outlook half. Outsolvi has native Outlook add-ins for Desktop, Web, and New Outlook, plus the Gmail extension.
What about deliverability with GMass cold-blast campaigns?+
This is the same trade-off any high-volume cold-outbound tool faces. Sending thousands of emails per week from a cold or warming domain carries real deliverability risk. GMass includes some warmup and deliverability tooling specifically for this, which is one of the reasons to be on the platform if you are running cold outbound at volume. Outsolvi customers typically send 50 to 200 emails per week from established sender domains where reputation is already strong, so the deliverability question does not apply in the same way.
What is the actual price difference?+
GMass Standard is $25 per user per month, Premium is $35, Business is $55, Enterprise is $95. Outsolvi Individual is $7 per user per month billed yearly ($12 monthly), Teams Pro is $20. So Outsolvi yearly versus GMass Standard is 3.6x cheaper. Versus GMass Enterprise the gap is 13.6x. The dollar gap per rep per year is between $216 and $1,056.
Can I run Outsolvi and GMass at the same time?+
Yes, technically. Both work as Gmail extensions, both inject their own tracking pixels, both record independently. Most teams who do this find the Outsolvi numbers are 30 to 50% lower than GMass because GMass counts every pixel load including MPP relays and scanner pre-fetches, while Outsolvi filters those out via Tier 1 to 5 confidence scoring. Run dual for two weeks during the Outsolvi free trial to see the gap on your real send volume.
Does GMass have AI follow-up signals like Outsolvi?+
GMass has auto-follow-up rules (send X after Y days if recipient did not open) but the rules are configured manually and operate at the campaign level, not the individual-prospect level. Outsolvi's AI follow-up signals look at the engagement pattern per prospect (opens across confidence tiers, click depth, reply latency) and flag the right ones to follow up with at the right moment. Different mechanism for a similar outcome.
The fastest answer is the 14-day free trial against your real send volume. No credit card, setup in 2 minutes.
GMass is the right tool for Gmail-only teams running cold-email at high volume, with mail merge from Google Sheets as the load-bearing feature. Outsolvi is the right tool for AE-grade relationship selling, across Outlook and Gmail, where tracking accuracy and AI follow-up signals matter more than mass-send throughput. The 14-day Outsolvi free trial costs nothing to test against your real send volume, and dual-running both for two weeks shows the open-rate accuracy gap clearly.
More about GMass
Per-competitor alternatives ranking, head-to-head matchups, and migration guide.
Run the numbers yourself
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Related comparisons and research
Other comparison pages, head-to-heads, ranked lists, and glossary entries on the same tools and topics.
Nate built Outsolvi after watching every email-tracking tool he had ever used lie to him about opens. Outsolvi runs Tier 1 to 5 confidence scoring on every open, native in Outlook and Gmail, so the number on the dashboard is one a rep can actually act on.
We update these pages when the underlying mechanics change. new mailbox-provider rules, new tracker behavior, new measurement gaps. The dates above are real revisions, not auto-touches.