GMass vs Tami AI: You're Comparing a Car to a Gas Station
You built a killer cold email sequence in GMass, hit send, and realized you have no one to send it to. So you searched for GMass vs Tami AI hoping one of them solves the whole problem. Here's the thing: GMass is a sending tool. Tami AI is a data platform. They don't compete. Picking between them is the wrong framing entirely.
30-Second Verdict
Use GMass if you already have a contact list and need a Gmail-native way to send sequences, track opens, and automate follow-ups.
Use Tami AI if you have a sending tool but no contacts - you need emails, phone numbers, and technographic data to build a list.
Use Prospeo if you need verified contact data that won't bounce. 98% email accuracy, a free tier of 75 emails/month, and native integrations with GMass, Instantly, Smartlead, and Lemlist.
Feature Comparison at a Glance
| GMass | Tami AI | |
|---|---|---|
| Category | Email sending/sequencing | B2B data/enrichment |
| Best for | Gmail mail merge, drip campaigns | Finding contacts, technographics |
| Starting price | $29.95/mo | $55/mo (Basic) |
| G2 rating | 4.8/5 (1,274 reviews) | 4.3/5 (139 reviews) |
| Key integrations | Gmail, Google Sheets | Salesforce, HubSpot, Pipedrive, Zoho, Salesloft, Close, Mailchimp |
| Free tier | No | 50 export credits + 5 mobile credits |
| Sends emails? | Yes | No |
| Contact database? | No | Yes |
| Bottom line | Best Gmail sender on the market | Decent data platform - verify before sending |
What Is GMass?
GMass is a Chrome extension that turns Gmail into a cold email platform. Connect it to Google Sheets, build personalized sequences, and send directly from your inbox - no separate UI to learn. Users have sent over 9 billion emails through the platform, and G2 reviewers consistently praise ease of use (223 mentions) and email tracking (106 mentions). G2 reports a typical ROI timeline of about 6 months.
The flip side: inbox clutter is the #1 complaint on G2 (57 mentions), and there's no built-in warm-up feature. One user in r/coldemail reported GMass sent 480 emails in a single batch instead of drip-feeding them, triggering an account ban. That's a rough afternoon. Prices also jumped 10-20% in January 2026 depending on the plan.
GMass is excellent at what it does. But it won't find you a single prospect.
GMass is built to send. But sending to bad data destroys your domain. Prospeo's 98% email accuracy and 7-day refresh cycle mean the contacts you export actually connect - not bounce. Stack Optimize kept bounce rates under 3% across every client campaign.
Feed GMass verified contacts at $0.01 each - 75 free to start.
What Is Tami AI?
Tami AI is a B2B data and enrichment platform covering 17M+ companies and 450M contacts. The technographic filtering lets you target companies running a specific payment provider, CRM, or shipping platform, and with 7M+ eCommerce merchants mapped globally, it's a strong fit for teams selling into that vertical. It also offers API access, with integrations spanning Salesforce, HubSpot, Pipedrive, Zoho, Salesloft, Close, and Mailchimp.
The problems show up in execution. Data accuracy is the recurring complaint on G2 - reviewers note contacts from incorrect companies and turnover stats that aren't current. Capterra reviewers flag clunky Excel exports with too many columns, and browser session timeouts occasionally interrupt workflow. Credits reset monthly with no rollover, so unused credits vanish. Tami AI has minimal Reddit presence; most user feedback lives on G2 and Capterra.
Let's be honest about their sub-5% bounce guarantee. It sounds impressive until you realize that's the floor, not the ceiling, for a quality data provider in 2026. We've tested platforms claiming similar numbers and found the real-world results vary wildly depending on the industry vertical and how recently the data was refreshed.
Pricing Breakdown
GMass Plans
| Plan | Monthly | Annual |
|---|---|---|
| Standard | $29.95/mo | $249/yr (~$20/mo) |
| Premium | $39.95/mo | $349/yr (~$29/mo) |
| Professional | $59.95/mo | $599/yr (~$49/mo) |
Team plans start at $35/user/month for 5 users, dropping to $22/user/month at 100. SMTP-sent emails beyond the first 10,000 cost $5 per 10,000.
Tami AI Plans
| Plan | Monthly | Annual | Credits |
|---|---|---|---|
| Free | $0 | - | 50 export + 5 mobile |
| Basic | $55/mo | $47/mo billed annually | 250 export + 40 mobile |
| Growth | $79/mo | $67/mo billed annually | 500 export + 80 mobile |
| Enterprise | Custom | Custom | Unlimited export |
Watch the credit system closely. A contact credit includes name, email + status, job title, and company phone/direct line. Mobile numbers use separate mobile credits. Nothing rolls over - if you're on Growth and only export 300 contacts one month, those 200 unused credits disappear. For comparison, Prospeo charges roughly $0.01/email with a free tier of 75 verified emails per month and no use-it-or-lose-it pressure.
Which Do You Actually Need?
HubSpot research shows manual prospecting eats 40% of a sales rep's week. That stat alone explains why these tools exist - and why you likely need both categories, not one or the other.
You have contacts but no way to email them at scale. GMass is your answer. Connect it to a Google Sheet, build your sequences, and send from Gmail.
You have a sending tool but no contacts. You need a data platform. Tami AI is one option, though the accuracy complaints on G2 are hard to ignore.
You need both, and you can't afford bounces. This is where the stack matters most. We've seen teams export 500 contacts from a data provider, load them into GMass, and watch half bounce - torching their domain reputation in a single afternoon. The difference between 95% and 98% email accuracy compounds fast across thousands of sends. One of our customers, Stack Optimize, built to $1M ARR while keeping client deliverability above 94% and bounce rates under 3% - that kind of margin only happens when your data source is airtight.
Better Data for Your Sender
Skip this section if you already have a data provider you trust. But if you've been burned by bad exports - contacts at companies they left two years ago, catch-all domains that silently eat your emails - it's worth looking at what's changed in the market.
Native integrations cover Instantly, Smartlead, Lemlist, Salesforce, and HubSpot. You can also push contacts to GMass via Google Sheets in seconds. The free tier gives you 75 verified emails per month - no credit card, no contract, no sales call.
If you want a broader view of providers, start with data enrichment and then compare options across B2B company data sources.
If you're still building your outbound motion, review sales prospecting techniques and a practical lead generation workflow before you scale sends.
Tami AI's accuracy complaints on G2 aren't random - stale data is the norm when refresh cycles stretch to 6 weeks. Prospeo refreshes every 7 days across 300M+ profiles, so the contacts you push to Google Sheets and send via GMass are current, verified, and deliverable.
Stop torching your sender reputation with outdated contact lists.
FAQ
Can you use GMass and Tami AI together?
Yes - they're complementary, not competing. Export contacts from Tami AI, import them into Google Sheets, and send via GMass. The critical step most teams skip: verify those emails before sending. One bad batch can tank your domain reputation for weeks.
Which is better for cold email outreach?
Neither alone is sufficient. GMass handles the sending; Tami AI handles the contacts. You need both a data source and a sender for cold outreach. GMass won't find prospects, and Tami AI won't send a single email.
What's a reliable free option for finding verified contacts?
Prospeo's free tier includes 75 verified emails and 100 Chrome extension credits per month - no credit card required. Tami AI offers 50 export credits free but without the same multi-step verification. For teams running real campaigns on a budget, high email accuracy prevents the domain damage that bad data causes.