GMass vs Mailshake
We give GMass a 2.4 GPA and Mailshake a 1.8, out of 4.0. GMass grades higher on value for money, the free plan and ease of use. Mailshake grades higher on platforms. They get the same grade on features.
Price, platforms and features side by side. The table says where each price was read and when.
GMass
Mail merge and cold email campaigns sent from inside Gmail
Mailshake
Per-user cold email sequences with a dialer on the top plan
How we grade them
| 2.4GPAGMassFair | 1.8GPAMailshakeWeak | |
|---|---|---|
| Value for money | BFive people on the Team plan pay $145 a month billed annually for every feature, $29 a head, or $175 billed monthly. That's inside the cheaper quarter's $32.50. A solo sender who wants follow-ups needs Premium at $29 an account billed annually. | CStarter's 1,500 sends and one address per person won't carry a sales team, so five people need Email Outreach: $45 a user billed yearly, $45 a head. That's above the category's $40 middle, while most email rivals here charge one price for the whole team. |
| Free plan and trial | CNo free plan. The 7-day trial needs no card but is capped at 50 emails a day, enough to check it works in your Gmail. | FNothing free. There's no free plan and no trial, and Mailshake says it takes payment up front. You can cancel before renewal, but that isn't a trial. |
| Features | CThe email job done fully from Gmail: unlimited emails and contacts, mail merge from Sheets, follow-ups that stop on a reply, A/B tests, inbox rotation and SMTP for big sends. It's a smaller job, though: no LinkedIn steps, and Standard has no follow-ups. | CEmail sequences with follow-ups, A/B tests, spintax, warm-up and unlimited verification, plus a power dialer on Sales Engagement. The gaps: no LinkedIn steps on record, and rotation and the unified inbox need Email Outreach. |
| Ease of use | BNo App Store rating on record, but it lives inside the Gmail you already use: write an email, pick a list or a Sheet and press the GMass button. Very little to learn. | CNo App Store rating on record. Quick enough to start, since it sends from Gmail, Office 365 or any SMTP mailbox and the AI writer drafts copy, but you still connect accounts and set up your domain. |
| Platforms and integrations | CIt needs Gmail or Google Workspace and the Chrome browser, so it's a computer-only tool. Google Sheets and Zapier connect, and there's an API from Premium. | BWeb and a browser extension, with Salesforce, Pipedrive, HubSpot and Zapier on Email Outreach and above. No phone or desktop app on record. |
| Best for | cold email without leaving Gmail | simple per-user cold email, with a dialer |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: GMass and Mailshake. How we grade
Price against what you get
GMass starts at $20 a month and scores 2.3 out of 4 on features, ease of use and platforms. Mailshake starts at $25 a month for each person and scores 2.3.
They score the same, and GMass starts $5 a month lower. Of the other cold outreach tools on the chart, none scores higher than GMass for less, and 1 scores higher than Mailshake for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- GMass starts at $20 per account / month, billed annually ($29.95 billed monthly). Mailshake starts at $25 per user / month, billed yearly ($29 monthly).
- Mailshake also covers templates.
At a glance
| GMass | Mailshake | |
|---|---|---|
| Pricing | Free trial | Paid |
| Starts at | $20 per account / month, billed annually ($29.95 billed monthly) | $25 per user / month, billed yearly ($29 monthly) |
| Free plan | None | None |
| Free trial | 7-day free trial limited to 50 emails per 24 hours, no credit card required | None listed |
| Web | ||
| Browser extension | ||
| Made by | GMass, Inc. | Mailshake, LLC |
| Price read from | gmass.co | mailshake.com |
| Checked | Oct 17, 2026 | Oct 17, 2026 |
Who each one suits
GMass
- People who want to send cold email without leaving Gmail
- Mail merges from a Google Sheet, including recurring sends
- Solo senders who need follow-ups but not a separate outreach app
Mailshake
- Small sales teams starting cold email from their own mailboxes
- Reps who want calls and emails in one sequence
- Teams that want shared templates and quick onboarding
Worth knowing
GMass
- Needs a Gmail or Google Workspace account and the Chrome browser; campaigns are written and sent from inside Gmail.
- Each subscription covers one Gmail account, and the Standard plan has no automatic follow-ups.
- Inbox rotation needs Professional or a Team plan; sending through GMass's own SMTP service costs $5 per 10,000 messages.
- Gmail's own daily sending limits still apply to anything sent through the Gmail account itself.
Mailshake
- There is no free trial or free plan: Mailshake takes payment up front.
- Starter connects 1 email address and stops at 1,500 sends a month; rotation, the unified inbox and CRM integrations need Email Outreach.
- Calling needs Sales Engagement, $99 per user a month billed monthly, and its free minutes cover North American numbers only.
- More Data Finder credits are an add-on from $17 a month billed yearly ($19 monthly).
Key features
GMass
- Campaigns from the Gmail compose window
- Write a campaign as an ordinary Gmail message, address it to a list, label or Google Sheet, and send it with the GMass button from your own account.
- Automatic follow-ups
- Unlimited follow-up stages that stop when a contact replies, clicks or opens, sent in the same thread or as new ones. Needs Premium or above.
- Google Sheets campaigns
- Merge fields come from a Google Sheet, GMass picks up edits made before a scheduled send, and new rows can be emailed automatically.
- Inbox rotation and SMTP
- MultiSend spreads one campaign across several mailboxes on Professional and Team, and an SMTP server can carry sends larger than Gmail allows.
- Reports in Gmail, the dashboard and the web
- Opens, clicks, replies, bounces and blocks arrive as Gmail reports, in the dashboard and as shareable web reports, with an AI Deep Analysis of the results.
- AI writing and SpinMax
- AI can draft a full campaign with its follow-ups, and SpinMax varies the wording of every email in a campaign automatically.
Mailshake
- Sequences and follow-ups
- Automated email sequences with follow-ups, advanced scheduling and throttling, A/B tests and spintax to vary parts of each email.
- Deliverability tools
- Free warm-up, unlimited email verification and list cleaning, a spam-word copy analyzer and a domain setup assistant come with every plan.
- SHAKEspeare AI writer
- Generates several versions of email copy from a short description of your business, on every plan.
- Lead Catcher and analytics
- Engaged leads and replies are gathered in one place, and team dashboards track opens, replies, clicks and each rep's activity.
- Power dialer
- Sales Engagement adds browser calling with 5 phone numbers, phone scripts and unlimited free minutes to North American numbers.
- Data Finder
- Search for prospects' business contact details by role, location or company. Sales Engagement includes 2,500 credits; the other plans get 50.
Plans
GMass
Standard$20
per account / month, billed annually ($29.95 billed monthly)
Unlimited emails, contacts and campaigns, mail merge, email verification and Spam Solver. No automatic follow-ups. $249 a year.
Premium$29
per account / month, billed annually ($39.95 billed monthly)
Adds sequences and automatic follow-ups, A/B testing, triggered emails, and the API and Zapier. $349 a year.
Professional$49
per account / month, billed annually ($59.95 billed monthly)
Adds inbox rotation across several sending accounts (MultiSend) and high-priority support. $599 a year.
Team$145
per month for up to 5 users, billed annually ($175 billed monthly)
Every feature, including inbox rotation, for 5 Gmail accounts. Packs of 10, 25, 50 and 100 users cost less per user.
Mailshake
Starter$25
per user / month, billed yearly ($29 monthly)
1 email address, 1,500 sends a month, unlimited contacts, warm-up and verification, A/B tests and the SHAKEspeare AI writer.
Email Outreach$45
per user / month, billed yearly ($49 monthly)
2 email addresses, unlimited sends, email rotation, a unified inbox, Salesforce, Pipedrive and HubSpot, Zapier and the browser extension.
Sales Engagement$85
per user / month, billed yearly ($99 monthly)
10 email addresses, 2,500 Data Finder credits, a power dialer with 5 numbers, phone scripts, lead temperature, tasks and a 1:1 onboarding call.
AgencyCustom
Everything in Sales Engagement with unlimited email addresses, sold through sales.
Ways to pay less
GMass
- Annual discount
Save up to 31% with annual billing
Standard costs $249 a year against $29.95 a month billed monthly, a saving of about 31%; Premium saves about 27% and Professional about 17%.
- Education
15% off for .edu Google Workspace accounts
GMass's pricing FAQ says Google Workspace users on a .edu domain get 15% off the published prices, applied automatically after subscribing.
- Nonprofit
15% off for .org Google Workspace accounts
The same 15% discount applies automatically to Google Workspace accounts on a .org domain; nonprofits on other domains do not get it.
Mailshake
- Annual discount
Lower per-user rates with yearly billing
Billed yearly, Starter is $25 per user a month instead of $29, Email Outreach $45 instead of $49 and Sales Engagement $85 instead of $99.
