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    All tool comparisons
    Tool comparison · Head to headUpdated 9/4/2026

    GMass vs MailHeat

    A factual comparison of features, pricing, and capabilities.

    01The contenders
    Tool A

    GMass

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

    Starting at$29.95/month
    Tool B

    MailHeat

    Inbox warmup and deliverability platform that simulates the positive engagement mailbox providers reward across a warmup pool, with gradual pacing, a per-inbox health dashboard and deliverability expert consulting on the higher tiers.

    Starting at$69.99/month
    02Line by line

    Pricing comparison.

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

    03Capabilities

    Feature comparison.

    FeatureGMassMailHeat
    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
    Secure SMTP connection
    Health & activity dashboard
    Gradual warmup pacing
    Email & chat support
    Deliverability expert consulting
    Free Deliverability Audit
    Success Manager
    Free tools
    Available
    Partial/Limited
    Not Available
    04Ecosystem

    Native integrations.

    GMass

    GmailGoogle SheetsZapierGoogle Workspace

    MailHeat

    SMTPGmailGoogle WorkspaceMicrosoft 365Outlook
    05Keep exploring

    Explore more.

    Best GMass alternativesBest MailHeat alternatives
    GMass vs InstantlyGMass vs SmartleadGMass vs LemlistMailHeat vs WarmboxMailHeat vs MailreachInboxAlly vs MailHeat
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    Information gathered from official sources and may change. Pricing and features last verified 9/4/2026. Please visit the official websites for the most current information.