Growbots vs Mailwarm: Cold Email Platform vs Email Warmup Tool Comparison
Compare Growbots (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.
Growbots is a cold email platform for outbound campaigns and prospecting, built around a database of 180M+ contacts, while Mailwarm is a dedicated email warmup tool focused on deliverability and inbox placement. Growbots starts free, Mailwarm starts at $79 per month. Many teams use both together rather than choosing one over the other.
Key takeaways
- Growbots offers a free Freemium plan, while Mailwarm's entry-level Starter plan costs $79 per month.
- Growbots lists access to a database of over 180 million prospects and email verification on import as key features.
- Mailwarm lists B2B and B2C warmup, spam score monitoring, and provider level warmup among its key features.
- Mailwarm offers four pricing tiers (Starter, Growth, Scale, and a Tailored Plan) compared to Growbots's three tiers.
- Both platforms integrate with Gmail and Outlook, but Growbots additionally connects with Salesforce, HubSpot, Zapier, SMTP, and IMAP.
Reviewed and updated September 2, 2026
Growbots vs Mailwarm: Cold Email Platform vs Email Warmup Tool Comparison
Growbots (cold email platform) and Mailwarm (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
Growbots 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, Growbots lists explore database of 180m+ prospects and email verification on import, and Mailwarm lists b2b & b2c warm up and spam score monitoring.
Growbots offers a lower entry point at $0/mo compared to Mailwarm at $79/mo.
If your priority is sending campaigns that land in the inbox and generate replies, Growbots 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
Growbots is Cold email software that finds prospects in a 180M+ contact database, warms up sending inboxes and automates outbound email campaigns. Also sells a Concierge service in which its own team runs the outbound process.
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
Freemium
Starter
Growbots Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Freemium | Free | Basic Filters; partial access to the 180M+ prospect database | 20 email accounts; 3 sequences; up to 20 per email daily |
| Starter Outreach | $29/mo | Credits (Per Propsect) From $0.13 | Unlimited email accounts; unlimited sequences; up to 100 per email daily |
| Pro Outreach | $39/mo | Credits (Per Propsect) From $0.13 | Unlimited email accounts; unlimited sequences; up to 500 per email daily |
Source: Growbots 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
Growbots is more affordable at the entry level ($0/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.
Mailwarm offers 4 pricing tiers compared to Growbots's 3, giving you more granularity as you scale.
Growbots includes a free tier, letting you test the platform before committing financially.
Features Breakdown
- Explore Database of 180M+ Prospects
- Email Verification on Import
- Gradual Automatic Warmup
- Custom Tracking Domain
- Spintax Formulas
- A/B Testing
- and 4 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
Growbots Key Features
- Explore Database of 180M+ Prospects
- Email Verification on Import
- Gradual Automatic Warmup
- Custom Tracking Domain
- Spintax Formulas
- A/B Testing
- Shared Inbox
- Out-Of-Office Rescheduling
- Warm Replies Detection
- Email Templates Generator
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 Growbots
- Explore Database of 180M+ Prospects
- Email Verification on Import
- Gradual Automatic Warmup
- Custom Tracking Domain
- Spintax Formulas
- A/B Testing
- Shared Inbox
- Out-Of-Office Rescheduling
- Warm Replies Detection
- Email Templates Generator
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
Growbots Integrations
Growbots connects with: Salesforce, HubSpot, Zapier, Gmail, Outlook, SMTP, IMAP.
Mailwarm Integrations
Mailwarm connects with: Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo, Custom SMTP.
Shared Integrations
Both tools integrate with: Gmail, Outlook.
Integrations listed only by Growbots: Salesforce, HubSpot, Zapier, SMTP, IMAP.
Integrations listed only by Mailwarm: Google Workspace, Microsoft 365, Yahoo, Custom SMTP.
Use Case Recommendations
Best Fit for Growbots
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (7 integrations)
- Teams that want to start free and scale up as needs grow
Best Fit for Mailwarm
- 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 | Growbots | Mailwarm |
|---|---|---|
| Starting Price | Free | $79/mo |
| Top Tier Price | $39/mo | Contact Sales |
| Total Features Listed | 10 | 9 |
| Integrations | 7 | 6 |
| Founded | 2014 | N/A |
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
Growbots serves the cold email outreach side of an outbound stack and Mailwarm the email domain warming and deliverability side. Growbots offers a more accessible entry point, 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 Growbots and Mailwarm for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Growbots and Mailwarm?
- Growbots is a cold email platform built for finding prospects and running outbound campaigns, using a database of over 180 million contacts. Mailwarm is an email warmup tool focused specifically on building sender reputation and improving inbox placement through simulated engagement across a network of aged inboxes.
- How much do Growbots and Mailwarm cost?
- Growbots offers a free Freemium plan, with paid tiers at $29 per month for Starter Outreach and $39 per month for Pro Outreach. Mailwarm starts at $79 per month for its Starter plan, rising to $189 per month for Growth and $549 per month for Scale, with a Tailored Plan available by contacting sales.
- Do I need both Growbots and Mailwarm?
- Many teams do run both, since the article notes they solve different problems rather than competing directly. Growbots handles prospecting and campaign sending, while Mailwarm handles warming up sender domains and monitoring deliverability, so combining them covers both outreach and inbox placement needs.
- What integrations does Growbots support that Mailwarm doesn't?
- Growbots integrates with Salesforce, HubSpot, Zapier, SMTP, and IMAP, none of which are listed among Mailwarm's integrations. Both tools share Gmail and Outlook integrations, while Mailwarm separately supports Google Workspace, Microsoft 365, Yahoo, and Custom SMTP.
- Which tool is better for improving email deliverability, Growbots or Mailwarm?
- Mailwarm is the tool built specifically for deliverability, offering spam score monitoring, provider level warmup, SPF, DKIM, and DMARC validation, and blacklist detection. Growbots does include gradual automatic warmup as a feature, but its core focus is cold email outreach rather than dedicated deliverability management.
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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