Tool comparison · Head to head

Apollo.io vs GMass

A factual comparison of features, pricing, and capabilities.

Updated 2/6/2026

The contenders

Tool A

Apollo.io

All-in-one sales intelligence and engagement platform combining a 275M+ contact database with automated sequences, email outreach, dialer, and AI-powered workflows for prospecting at scale.

Starting atCustom0

Tool B

GMass

Gmail-based mass email and mail merge platform with unlimited emails, campaigns, and contacts directly inside Gmail.

Starting at$30/month

Line by line

Pricing comparison.

Monthly rates shown. Annual billing may offer discounts. Visit official sites for current pricing.

Capabilities

Feature comparison.

Feature	Apollo.io	GMass
B2B contact and company database (275M+ contacts)
Multi-channel sequences (email, phone, LinkedIn)
AI-powered email writing and optimization
Built-in dialer with call recording
Automated workflows and engagement rules
A/B testing for email sequences
Buying intent signals and job change alerts
Advanced lead scoring and filtering
Email deliverability tools and mailbox rotation
Conversation intelligence (Professional+)
Works inside Gmail
Unlimited emails, contacts, and campaigns
Mail merge personalization
Free email verification
Automated follow-up sequences
A/B testing
Spam Solver deliverability tool
Custom tracking links
Inbox rotation
API and Zapier access

Available

Partial/Limited

Not Available

Ecosystem

Native integrations.

Apollo.io

SalesforceHubSpotPipedriveGmailMicrosoft OutlookLinkedInZapierSlackSendgridOutreachSalesloftWebhooks API

GMass

GmailGoogle SheetsZapierGoogle Workspace

Keep exploring

Explore more.

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Apollo.io vs Outreach

Apollo.io vs Salesloft

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Information gathered from official sources and may change. Pricing and features last verified 2/6/2026. Please visit the official websites for the most current information.