GMass and Mailshake both come up when people look for a way to find prospects and reach them. Here is how they compare on price, data, sending, channels and AI, using facts from each vendor’s own site, last checked October 1, 2026.
Short answer. GMass is best for gmail and Google Workspace users who want mail merges and cold email campaigns with follow-ups straight from Gmail and Google Sheets. Mailshake is best for small teams that want a simple, low-cost cold email tool with an optional dialer.
At a glance
Pricing
| GMass | Mailshake | |
|---|---|---|
| Starting price | From $29.95/month | From $29/month |
| Free plan | No | No |
| Trial | Free to try ('Try GMass for free'); the pricing page does not state trial length or limits | No free trial; payment is collected up front (with onboarding and deliverability support) |
| Plans | Standard (individual): $29.95/month (monthly billing) ($20/month billed yearly ($249/year)) · 1 user; unlimited emails (breaking Gmail limits depends on account configuration), unlimited contacts and campaigns, mail merge personalization, free email address verification, custom tracking links, Spam Solver. No sequences/follow-ups, no API, no A/B testing, no inbox rotation Premium (individual): $39.95/month (monthly billing) ($29/month billed yearly ($349/year)) · Everything in Standard plus sequences and follow-ups, API access (+Zapier), A/B testing, triggered emails. No inbox rotation Professional (individual): $59.95/month (monthly billing) ($49/month billed yearly ($599/year)) · Everything in Premium plus Inbox Rotation (MultiSend) and high-priority support Team (5 users): $175/month (monthly billing) ($145/month billed yearly ($1,750/year)) · All features for 5 users. Other team sizes listed: 10 users $295/month or $2,950/year; 25 users $725/month or $7,250/year; 50 users $1,350/month or $13,500/year; 100 users $2,200/month or $22,000/year | Starter: $29/month (monthly billing) ($25/month billed yearly) · 1 email address, 1,500 email sends/month, unlimited uploaded contacts, 50 Data Finder credits, unlimited warm-up and campaigns, unlimited email verification, AI email writing Email Outreach: $49/month (monthly billing) ($45/month billed yearly) · 2 email addresses, unlimited sends, 50 Data Finder credits, email rotation, unified inbox, Salesforce/Pipedrive/HubSpot integrations, Zapier Sales Engagement: $99/month (monthly billing) ($85/month billed yearly) · 10 email addresses, unlimited sends, 2,500 Data Finder credits, 5 phone numbers, unlimited dialer minutes in North America, power dialer, 1-on-1 onboarding Agency: Contact sales · All of Sales Engagement plus unlimited email addresses |
Features side by side
| GMass | Mailshake | |
|---|---|---|
| Lead data | No B2B lead database; an 'Email List Builder' creates lists by searching your own Gmail account | Data Finder: search decision makers by role, location or company; 50 credits on Starter and Email Outreach, 2,500 on Sales Engagement, add-on $19/month |
| Warm-up | Not listed on its site | Unlimited email warm-up included |
| Sending inboxes | Works inside Gmail; third-party SMTP integration (multiple SMTP servers); Inbox Rotation (MultiSend) on Professional and team plans | 1, 2 or 10 email addresses depending on plan; unlimited on Agency; Google Workspace, Outlook and SMTP |
| Not listed on its site | Social media steps can be added to sequences ("incorporating social media into your outreach sequences"); dedicated LinkedIn automation not described | |
| Calls, SMS, WhatsApp | No calling or prospect SMS stated; text.email offers email-to-SMS alerts for replies (notifications to the sender) | Phone dialer with unlimited VoIP calls to the US and Canada on Sales Engagement; SMS and WhatsApp not mentioned |
| AI writing | ChatGPT can write campaigns; SpinMax AI automatic spintax; AI template builder for HTML layouts; AI suggestions in Spam Solver; Deep Analysis AI campaign reports | SHAKEspeare AI email writer (copy generation, spintax, A/B testing) |
| Replies / inbox | Reply management and instant reply/bounce detection; 'The Reply Project' to reply faster. No AI reply classification stated | Lead Catcher: one view of the emails, social messages and calls each prospect received; AI reply handling not mentioned |
| CRM | No native CRM listed; free Google Sheets CRM template; REST API, webhooks and Zapier | Salesforce, Pipedrive, HubSpot (Email Outreach plan and up); 1,000+ via Zapier |
| API | REST API, webhooks and Zapier on Premium and above | Public API (api-docs.mailshake.com) |
| Agencies | Not listed on its site | Agency plan (contact sales) with unlimited email addresses; white label not mentioned |
Facts from each vendor’s own pricing and product pages, last checked October 1, 2026: GMass, Mailshake. Prices change often, so check before you buy.
Where GMass stands out
- Unlimited emails, contacts and campaigns on every plan
- Runs inside Gmail with deep Google Sheets mail merge (dynamic lists, auto-send to new rows)
- Built-in email verification plus free deliverability tools (inbox/spam tester, SMTP tester, link checker)
- Unlimited auto follow-up stages, A/B testing and triggered emails on Premium
- Low entry price ($20/month billed yearly)
Limitations
- Gmail-centric: works as a Gmail Chrome extension
- Follow-up sequences and API not included in Standard; inbox rotation only on Professional and team plans
- No B2B lead database or LinkedIn outreach offered
- No free plan listed on the pricing page
Where Mailshake stands out
- Low entry price ($25/month billed yearly)
- Unlimited warm-up and email verification included
- AI email writer included
- Built-in phone dialer on the Sales Engagement plan
Limitations
- No free plan and no free trial (payment up front)
- Starter is limited to 1 email address and 1,500 sends/month
- Priced per user
- Lead data limited to small credit allowances unless on Sales Engagement or the Data Finder add-on
And if you don’t have a list yet?
Both tools expect you to decide who to contact. If you sell to small or local businesses, or you want the targeting and the writing done for you, LeadGen.tools reads your website, finds the companies and the person who decides at each one, and writes a different email for every prospect. Free plan, no card.
FAQ
Is GMass cheaper than Mailshake?
By listed starting price: GMass from $29.95/month, Mailshake from $29/month. Limits per plan differ, so compare what each plan includes.
Does GMass or Mailshake have a free plan?
GMass: no free plan listed. Mailshake: no free plan listed.
What is the main difference between GMass and Mailshake?
They differ most on: lead data, warm-up, linkedin, calls, sms, whatsapp. GMass is best for gmail and Google Workspace users who want mail merges and cold email campaigns with follow-ups straight from Gmail and Google Sheets. Mailshake is best for small teams that want a simple, low-cost cold email tool with an optional dialer.
Related comparisons
See it on your own business. Paste your website and watch LeadGen.tools find your best customers, the person who decides at each one, and write the emails. Free, no card. Analyze your website →