Reachkit vs GMass

GMass is the better pick if you want to stay in Gmail and send from a few Google accounts; Reachkit is the better pick once cold email needs its own domains, many inboxes, warmup and one place for replies. GMass leaves the sending setup to you, and Reachkit builds it for you. I checked these facts in October 2026.

Pick GMass if:

• You live in Gmail and Google Sheets and want mail merge without a new app to learn.
• You send modest volume from one to three Google accounts.
• You want one $59.95 Professional seat to rotate across extra Google accounts at no extra fee.

Pick Reachkit if:

• You want new sending domains plus Google Workspace or Microsoft 365 inboxes configured and warmed for you.
• You want replies from all your inboxes in one place, and teammates without seat fees.
• You want verified leads included: 1,000 credits a month on the $39 Growth plan.

With GMass you build the sending side yourself; with Reachkit you can order it built. GMass is a Chrome extension that adds a button to Gmail’s compose window, and for one or two Google accounts you already have, that’s the whole setup.

For cold email at volume, inbox rotation (spreading a campaign across many inboxes) is where the work starts: you buy domains, pay Google for a Workspace account per inbox, add SPF, DKIM and DMARC records (DNS entries that prove mail is yours) to each domain, and connect every account to MultiSend, GMass’s rotation feature. GMass’s own guide calls the DNS step “…time-consuming and unavoidable”, says to warm up manually, and tells beginners: “Don’t pay for a cold email infrastructure service.”

Reachkit makes the opposite bet. Its AI drafts the sequence and sizes an audience from a one-sentence brief, and for done-for-you Google Workspace or Microsoft 365 inboxes, Reachkit registers lookalike domains, writes the DNS records, sets up every mailbox under your sender name and photo, then starts warmup. Inboxes you already own connect free.

Reachkit wants three weeks of warmup, at minimum, before a campaign starts, which is why I plan every cold email test at eight weeks. For the do-it-yourself route, see my guide to cold email infrastructure.

GMass is built around two Google tools many people already live in, which is its real strength. A campaign starts as an ordinary Gmail draft, and the list is a Google Sheet whose rows are recipients and columns merge fields; GMass can send to new rows and write opens, clicks and replies back to the sheet.

It’s general mail merge, so it handles newsletters, announcements and transactional email too, and GMass says its users have sent more than 9 billion emails since 2015. For personal-scale outreach, like a founder emailing investors, it fits very well.

It strains when cold email becomes an operation:

• Every extra inbox is a Google account you create, authenticate, warm and connect yourself, and there’s no Outlook version.
• Each MultiSend campaign belongs to one person’s main account; GMass says “MultiSend is intended for one user distributing a campaign across their own accounts, not for multiple users all sharing bits and pieces of one campaign.”
• Agencies separate clients by Google account, with no client workspaces documented; Reachkit gives each client its own.

GMass gives you good tools to check deliverability and leaves the sending discipline to you (its homepage says “Deliverability is a shared responsibility”), while Reachkit builds that discipline into its defaults.

GMass sends through the Gmail API, so Google’s daily sending limits still apply. Open and click tracking are on by default, though GMass’s own guides suggest cold emailers switch click tracking off. There’s no warmup: GMass shut its system down on January 31, 2023, after, in its words, “…Google flat out told us to shut down our warmup system or we’d lose our Gmail API access.”

Testing is where GMass is ahead: Spam Solver, on every plan, checks a draft’s placement across 20 Gmail and Google Workspace accounts, some behind Barracuda, Sophos and ProofPoint filters, and verification is free, where Reachkit charges 1 credit per 10 addresses. Reachkit has no placement tests; its free spam checker reads content only.

Reachkit’s protection is what happens if you change nothing:

• Done-for-you inboxes send from new lookalike domains, never your main one.
• A fresh inbox sends 3 campaign emails a day at first, climbing by 3 to 20.
• AI-written warmup starts by itself on every inbox.
• Open tracking starts off and click tracking doesn’t exist, since pixels and rewritten links can cost you inbox placement.
• CSV imports are verified by default, unsubscribes are blocked workspace-wide, and campaigns pause once bounces top 5%.

GMass keeps your day in Gmail, but with several inboxes, replies arrive in several places. Its pitch is “If you know how to use Gmail, then you know how to use GMass”, and it adds: “If you want a wizard that reveals one setting at a time, GMass may feel like too much. But you’ll work 10x faster.”

Replies land in whichever Gmail account sent the email. GMass spots them within seconds and stops follow-ups, and its Reply Project gathers one campaign’s replies across your MultiSend accounts, with ChatGPT drafts. GMass says the narrow view is deliberate, to cut clutter: it shows “…replies to your campaign, not every email you’ve received at every one of your accounts.”

In Reachkit, replies from all your inboxes land in the Unibox with an AI label such as Interested or Not Now. Inboxes on a live campaign are checked about once a minute, so GMass notices a reply sooner. The reply is where cold email is won or lost, so I want them in one list.

For teams, Reachkit sets permissions per feature with no per-user fee (each client workspace needs its own plan), while a GMass team leader can manage members’ campaigns but “…you cannot send emails on behalf of someone else”.

Neither GMass nor Reachkit runs outbound on autopilot; both use AI to help you write and read. GMass has a ChatGPT campaign writer on every plan, AI spintax and templates, sentiment labels and ChatGPT drafts for replies, and Deep Analysis, which explains your campaign reports.

Reachkit’s AI is busiest before the first send: one sentence becomes a sequence plus an audience of verified leads, an AI writes the warmup, and every reply gets one of 12 labels. It doesn’t draft answers or book meetings, so on reply drafting GMass is ahead.

GMass has a REST API and Zapier from Premium ($39.95), plus webhooks, though Zapier can’t launch a campaign and HubSpot logging works by BCC. It has no official server for MCP, the connector standard Claude and ChatGPT use to run tasks in other software.

Reachkit’s MCP server is on every plan, trial included, built to show you each email and wait for your go before launch. Its API and webhooks, Zapier and n8n, and CRM sync for HubSpot, Zoho, Odoo and GoHighLevel need Scale, from $99.

Most of a GMass budget goes to Google: each mailbox is a Google Workspace seat ($8.40 a month on Google’s flexible plan). Figures are US list prices with monthly billing, before lead data, from each vendor’s public pricing page as of October 2026.

A founder starting out: 1 user, 10 inboxes on 5 domains, about 4,000 emails a month to 1,500 new prospects.

Standard ($29.95) lacks follow-ups and Premium ($39.95) lacks rotation, so Professional is the plan here; one seat covers all 10 inboxes. With the same Workspace inboxes, Reachkit costs about $127 to $129.

An agency or growing team: 3 users, 60 inboxes on 20 domains, about 25,000 emails a month to 10,000 new prospects.

Team plans start at five seats, still under three Professional seats ($179.85). Google Workspace is about 72% of the GMass total and GMass about 25%; with your own Workspace inboxes, Reachkit costs about $620 to $628.

One thing cuts the other way: GMass doesn’t cap contacts or emails (Google’s limits still apply), while Reachkit’s plans cap monthly emails and stored contacts. Both scenarios fit the email caps, but Growth’s 5,000 contacts last the founder about three months and Scale’s 25,000 last the agency two and a half, so prune finished campaigns or move up a tier: Scale ($99, or $155.25 a month all in) for the founder, $239 for the agency ($564 a month all in).

Billed annually: Reachkit $85.25 and $404 a month, GMass about $124 to $126 and $582 to $591. Reachkit’s totals include 1,000 or 5,000 lead credits a month; GMass charges extra for SMTP sending (its pricing sheet lists $5 per 10,000 messages) and for ColdSMTP, its cold email server ($99 a month on top of a plan, by application).

GMass has a large, mostly happy user base: the Chrome Web Store lists 400,000 users and a 4.8 rating from about 9,200 ratings, and search results show roughly 4.7 on G2 and 4.8 on Capterra, each from more than 1,300 reviews (October 2026). One Trustpilot reviewer put it this way: “…you wouldn’t even know that you’re using a third-party software.”

Trustpilot is harsher, at 3.0 from 39 reviews on a profile GMass hasn’t claimed. Two complaints repeat there:

• Billing and cancellation, which also come up in the comments under GMass’s cancellation guide. That guide warns: “Uninstalling the GMass extension does not automatically cancel your subscription to GMass.”
• Support speed, from “The support answers within 48 hours…” in one review to “I get a response avg 2-7 days later…” in another.

One Reddit user put the tradeoff plainly: “It’s cheap and integrates directly with your Gmail account. Problem is it’s pretty limited on volume and customization.”

GMass is the one I’d recommend in these cases:

• You live in Gmail and Google Sheets. GMass adds campaigns, follow-ups and reporting with no new tool to learn, and auto-sending to new sheet rows is handy; Reachkit works from CSV imports, its Lead Finder or the API on Scale.
• You send modest volume from one to three Google accounts. Premium at $39.95 a month covers follow-ups, and Professional at $59.95 adds rotation across extra Google accounts at no extra fee. If those accounts already send well, there’s nothing else to buy.
• Your email isn’t only cold outreach. Newsletters, announcements and transactional email go out from the same Gmail account, with triggered emails when someone opens, clicks or replies. Reachkit is built for cold outreach, with no click tracking and open tracking off by default.

Leaving GMass is mostly about your Google accounts, which are already yours: about a day of work if you keep them, three weeks if you add new inboxes. I’d go in this order:

1. Export your data. Your lists already live in Google Sheets, so download them as CSV, plus your unsubscribe and bounce lists via the “download all” link in GMass’s reports.
2. Connect your Google accounts. Workspace inboxes connect with a Google sign-in (your admin may need to approve Reachkit once). Sender reputation belongs to the mailbox and its domain, so it moves with you, and you can turn off Reachkit’s ramp-up for already-warm inboxes. Personal @gmail.com addresses connect with an App Password, though Reachkit’s help center calls them a poor fit for cold email.
3. Stop sending from two places. Remove the accounts from MultiSend and revoke GMass’s access in your Google account.
4. Set up the campaign. Upload the CSV for Reachkit to verify, put your unsubscribes and bounces on the blocklist, then bring your copy over or have the AI write a first draft.
5. Cancel GMass in its dashboard. Uninstalling the extension doesn’t cancel it; card subscribers keep access until the paid period ends.

If you order new inboxes, keep GMass sending until they’ve warmed.

I like GMass. It turns the Gmail you already use into a mail merge and follow-up tool at a fair price, and if your outreach fits in one to three Google accounts and a sheet, I’d stay there. Past that, cold email becomes infrastructure work: domains, DNS, warmup, dozens of inboxes and replies scattered across them. That’s the part Reachkit sets up for you, with careful sending defaults, one Unibox and no seat fees. Test it free for 30 days, no card needed, while GMass keeps running.

More comparisons: Reachkit vs Hunter, Reachkit vs Mailshake and Reachkit vs Woodpecker.