Instantly vs Mailwarm: Cold Email Platform vs Email Warmup Tool Comparison
Compare Instantly (cold email platform) and Mailwarm (email warmup tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Instantly is a cold email platform built for cold outreach campaigns, priced from $47 per month, while Mailwarm is an email warmup tool built for sender reputation and inbox placement, priced from $79 per month. Instantly lists unlimited email accounts and unlimited warmup, Mailwarm lists B2B and B2C warmup with spam score monitoring. Many teams use both together.
Key takeaways
- Instantly's Growth plan starts at $47 per month with 1000 uploaded contacts and 5000 emails monthly.
- Mailwarm's Starter plan starts at $79 per month for one mailbox and up to 50 warmup emails per day.
- Instantly lists integrations with HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, and Google Calendar, totaling nine integrations.
- Mailwarm lists integrations with Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo, and Custom SMTP.
- Mailwarm includes a deliverability expert on every plan and validates SPF, DKIM, and DMARC records.
Reviewed and updated September 2, 2026
Instantly vs Mailwarm: Cold Email Platform vs Email Warmup Tool Comparison
Sales teams building an outbound stack often weigh Instantly, a cold email platform for cold email outreach, against Mailwarm, an email warmup tool for email domain warming and deliverability. They cover different parts of the workflow, so this comparison covers what each one does, what each one costs, and where they overlap.
The Quick Answer
Instantly is a cold email platform for cold email outreach; Mailwarm 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 Mailwarm lists b2b & b2c warm up and spam score monitoring.
Instantly offers a lower entry point at $47/mo compared to Mailwarm at $79/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 Mailwarm. 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.
Mailwarm is Email warmup and deliverability platform that generates engagement across a network of aged real inboxes and includes a deliverability expert on every plan. Each interaction produces several positive signals, such as marking as non-spam, opening, marking as important and replying.
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
Mailwarm Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $79/mo | 1 mailbox/SMTP to warm; 1 user | Up to 50 warmup emails/day |
| Growth | $189/mo | 3 mailboxes/SMTPs to warm; 2 users | Up to 200 warmup emails/day |
| Scale | $549/mo | 10 mailboxes/SMTPs to warm; 5 users | Up to 500 warmup emails/day |
| Tailored Plan | Contact Sales | unlimited mailboxes, users | unlimited warmup emails, and replies |
Source: Mailwarm Pricing
Pricing Analysis
Instantly is more affordable at the entry level ($47/mo vs $79/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
- B2B & B2C warm up
- Spam score monitoring
- Provider-Level warmup
- Warmup your email content
- Authentication fix tools
- No IMAP access required
- and 3 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+)
Mailwarm Key Features
- B2B & B2C warm up
- Spam score monitoring
- Provider-Level warmup
- Warmup your email content
- Authentication fix tools
- No IMAP access required
- Progressive volume ramp-up to avoid spam filters
- SPF, DKIM, and DMARC validation
- Blacklist detection across major databases
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 Mailwarm
- B2B & B2C warm up
- Spam score monitoring
- Provider-Level warmup
- Warmup your email content
- Authentication fix tools
- No IMAP access required
- Progressive volume ramp-up to avoid spam filters
- SPF, DKIM, and DMARC validation
- Blacklist detection across major databases
Integration Ecosystem
Instantly Integrations
Instantly connects with: HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, Google Calendar.
Mailwarm Integrations
Mailwarm connects with: Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo, Custom SMTP.
Integrations listed only by Instantly: HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, Google Calendar.
Integrations listed only by Mailwarm: Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo, Custom SMTP.
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 Mailwarm
- Teams that need a wide feature set (9 capabilities listed)
- Enterprise buyers who prefer custom pricing and dedicated support
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
Feature Comparison Summary
| Feature | Instantly | Mailwarm |
|---|---|---|
| Starting Price | $47/mo | $79/mo |
| Top Tier Price | Contact Sales | Contact Sales |
| Total Features Listed | 8 | 9 |
| Integrations | 9 | 6 |
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 Mailwarm the email domain warming and deliverability side. Instantly offers a more accessible entry point at $47/mo, while Mailwarm starts at $79/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 Mailwarm for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Instantly and Mailwarm?
- Instantly is a cold email platform built for sending outreach campaigns, while Mailwarm is an email warmup tool built for building sender reputation and improving inbox placement. Instantly focuses on unlimited email accounts, warmup, and a lead database, while Mailwarm focuses on warming domains through a network of aged real inboxes.
- Which is cheaper, Instantly or Mailwarm?
- Instantly is cheaper at the entry level, starting at $47 per month compared to Mailwarm's $79 per month starting price. Instantly's Growth plan includes 1000 uploaded contacts and 5000 emails monthly, while Mailwarm's Starter plan covers one mailbox and up to 50 warmup emails per day.
- Do I need both Instantly and Mailwarm?
- Many teams run both because they cover different parts of the outbound workflow. Instantly is built for sending campaigns that land in the inbox and generate replies, while Mailwarm is built for building sender reputation and improving deliverability before or alongside outreach.
- What integrations does Instantly support that Mailwarm doesn't?
- Instantly lists integrations with HubSpot, Salesforce, Pipedrive, Zapier, Make, n8n, Clay, Slack, and Google Calendar, nine integrations in total. Mailwarm's listed integrations are limited to Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo, and Custom SMTP.
- What features does Mailwarm offer that Instantly doesn't list?
- Mailwarm lists B2B and B2C warmup, spam score monitoring, provider-level warmup, authentication fix tools, no IMAP access required, progressive volume ramp-up, SPF, DKIM, and DMARC validation, and blacklist detection across major databases. These are listed only on Mailwarm's own feature page, not Instantly's.
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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