Instantly vs MailHeat: Cold Email Platform vs Email Warmup Tool Comparison
Compare Instantly (cold email platform) and MailHeat (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Compare Instantly (cold email platform) and MailHeat (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Reviewed and updated September 4, 2026
Instantly vs MailHeat: Cold Email Platform vs Email Warmup Tool Comparison
Instantly (cold email platform) and MailHeat (email warmup tool) sit next to each other in many outbound stacks. They are not substitutes for each other on every job, so this comparison covers pricing, features, and integrations for each and points out where the two meet.
The Quick Answer
Instantly is a cold email platform for cold email outreach; MailHeat is an email warmup tool for email domain warming and deliverability. By each vendor's own wording, Instantly lists unlimited email accounts and unlimited email warmup, and MailHeat lists secure smtp connection and health & activity dashboard.
Instantly offers a lower entry point at $47/mo compared to MailHeat at $69.99/mo.
If your priority is sending campaigns that land in the inbox and generate replies, Instantly is the one built for it; for building sender reputation and improving inbox placement, that is MailHeat. Many teams run one of each.
Understanding the Core Difference
Instantly is Cold email platform with unlimited email accounts, unlimited warmup, and a 450M+ B2B lead database.
MailHeat is 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.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Growth
Starter
Instantly Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Growth | $47/mo | 1000 Uploaded Contacts | 5000 Emails Monthly |
| Hypergrowth | $97/mo | 25 000 Uploaded Contacts | 125,000 emails/month |
| Light Speed | $358/mo | 100 000 Uploaded Contacts | 500 000 Emails Monthly |
| Enterprise | Contact Sales | 100 000+ Uploaded Contacts | 500 000+ Emails Monthly |
Source: Instantly Pricing
MailHeat Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $69.99/mo | 1 account to warm (1 SMTP); 1 user | Up to 50 emails/day |
| Growth | $159.99/mo | Up to 3 accounts to warm (3 SMTPs); 2 users | Up to 200 emails/day per inbox |
| Scale | $479.99/mo | Up to 10 accounts to warm (10 SMTPs); 5 users | Up to 500 emails/day per inbox |
| Tailored Plan | Contact Sales | Unlimited accounts & SMTPs; unlimited users | Unlimited emails/day |
Source: MailHeat Pricing
Pricing Analysis
Instantly is more affordable at the entry level ($47/mo vs $69.99/mo). For teams with tight budgets or those just getting started with cold email outreach and email domain warming and deliverability, this price difference matters.
Features Breakdown
- Unlimited email accounts
- Unlimited email warmup
- Email verification
- Master inbox
- Campaign analytics
- A/B testing
- and 2 more listed below
- Secure SMTP connection
- Health & activity dashboard
- Gradual warmup pacing
- Email & chat support
- Deliverability expert consulting
- Free Deliverability Audit
- and 2 more listed below
Instantly Key Features
- Unlimited email accounts
- Unlimited email warmup
- Email verification
- Master inbox
- Campaign analytics
- A/B testing
- AI-powered features
- Dedicated IP rotation (Light Speed+)
MailHeat Key Features
- Secure SMTP connection
- Health & activity dashboard
- Gradual warmup pacing
- Email & chat support
- Deliverability expert consulting
- Free Deliverability Audit
- Success Manager
- Free tools
The two lists below are a diff of each vendor's own feature list by exact wording, so a capability both tools offer can appear on either side under a different name.
Listed only by Instantly
- Unlimited email accounts
- Unlimited email warmup
- Email verification
- Master inbox
- Campaign analytics
- A/B testing
- AI-powered features
- Dedicated IP rotation (Light Speed+)
Listed only by MailHeat
- Secure SMTP connection
- Health & activity dashboard
- Gradual warmup pacing
- Email & chat support
- Deliverability expert consulting
- Free Deliverability Audit
- Success Manager
- Free tools
Integration Ecosystem
Instantly Integrations
Instantly connects with: HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, Google Calendar.
MailHeat Integrations
MailHeat connects with: SMTP, Gmail, Google Workspace, Microsoft 365, Outlook.
Integrations listed only by Instantly: HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, Google Calendar.
Integrations listed only by MailHeat: SMTP, Gmail, Google Workspace, Microsoft 365, Outlook.
Use Case Recommendations
Best Fit for Instantly
- Budget-conscious teams looking for an affordable cold email platform
- Organizations with complex tech stacks needing broad integration support (9 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for MailHeat
- Enterprise buyers who prefer custom pricing and dedicated support
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
- Agencies managing warmup across multiple client domains
Feature Comparison Summary
| Feature | Instantly | MailHeat |
|---|---|---|
| Starting Price | $47/mo | $69.99/mo |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 8 | 8 |
| Integrations | 9 | 5 |
Getting Started Checklist
- Define your cold email outreach and email domain warming and deliverability requirements and monthly budget
- Estimate your expected email sending volume and warmup email volume to find the right tier
- List the integrations your team currently relies on
- Sign up for free trials or demos of both platforms
- Run a small test with each tool before making a commitment
- Evaluate the onboarding experience and support quality
Final Thoughts
Instantly serves the cold email outreach side of an outbound stack and MailHeat the email domain warming and deliverability side. Instantly offers a more accessible entry point at $47/mo, while MailHeat starts at $69.99/mo. Your decision should weigh pricing against the specific features that matter most for your workflow.
Start with a trial of each to see which platform fits your team's daily process. The best tool is the one your team actually uses consistently.
Pricing and features verified as of September 2026. Visit Instantly and MailHeat for current information.
About the author.
Tim Carden is CMO / CTO at RevenueFlow, which builds and operates outbound revenue engines for B2B companies. Studied at McGill University.
Tim Carden · CMO / CTO
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