Growbots vs Warmbox: Cold Email Platform vs Email Warmup Tool Comparison
Compare Growbots (cold email platform) and Warmbox (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 finding prospects and running outbound campaigns, while Warmbox is an email warmup tool for building sender reputation and inbox placement. Growbots starts free, Warmbox starts at $19/mo. Teams focused on sending campaigns choose Growbots; teams focused on deliverability choose Warmbox, and many use both.
Key takeaways
- Growbots offers a free Freemium plan while Warmbox's entry-level Solo plan costs $19/mo.
- Growbots lists access to a database of 180M+ prospects and email verification on import as key features.
- Warmbox lists automated email warmup with AI-powered interactions and customizable warmup recipes as key features.
- Warmbox offers 4 pricing tiers (Solo, Start-up, Growth, Enterprise) compared to Growbots's 3 (Freemium, Starter Outreach, Pro Outreach).
- Growbots integrates with Salesforce, HubSpot, Zapier, Gmail, Outlook, SMTP, and IMAP, while Warmbox integrates with Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo Mail, Amazon SES, SMTP, and Zoho Mail.
Reviewed and updated September 2, 2026
Growbots vs Warmbox: Cold Email Platform vs Email Warmup Tool Comparison
Sales teams building an outbound stack often weigh Growbots, a cold email platform for cold email outreach, against Warmbox, 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
Growbots is a cold email platform for cold email outreach; Warmbox 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 Warmbox lists automated email warmup with ai-powered interactions and customizable warmup recipes and strategies.
Growbots offers a lower entry point at $0/mo compared to Warmbox at $19/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 Warmbox. 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.
Warmbox is AI-powered email warmup tool that automates inbox warming with customizable recipes, spam score monitoring, and detailed analytics dashboards to improve cold email deliverability.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Freemium
Solo
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
Warmbox Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Solo | $19/mo | 1 inbox warm-up; 1 team member | 50 emails/day |
| Start-up | $79/mo | 3 inbox warm-up; 3 team members | 250 emails/day |
| Growth | $159/mo | 6 inbox warm-up | 500 emails/day |
| Enterprise | Contact Sales | custom | custom |
Source: Warmbox Pricing
Pricing Analysis
Growbots is more affordable at the entry level ($0/mo vs $19/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.
Warmbox 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
- Automated email warmup with AI-powered interactions
- Customizable warmup recipes and strategies
- Spam score monitoring and blacklist checks
- Real-time analytics and reporting dashboard
- DNS checker (SPF, DKIM, DMARC)
- Multi-inbox support within a single account
- and 2 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
Warmbox Key Features
- Automated email warmup with AI-powered interactions
- Customizable warmup recipes and strategies
- Spam score monitoring and blacklist checks
- Real-time analytics and reporting dashboard
- DNS checker (SPF, DKIM, DMARC)
- Multi-inbox support within a single account
- Auto-reply, open, and favorite marking simulation
- Team collaboration with per-plan member limits
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 Warmbox
- Automated email warmup with AI-powered interactions
- Customizable warmup recipes and strategies
- Spam score monitoring and blacklist checks
- Real-time analytics and reporting dashboard
- DNS checker (SPF, DKIM, DMARC)
- Multi-inbox support within a single account
- Auto-reply, open, and favorite marking simulation
- Team collaboration with per-plan member limits
Integration Ecosystem
Growbots Integrations
Growbots connects with: Salesforce, HubSpot, Zapier, Gmail, Outlook, SMTP, IMAP.
Warmbox Integrations
Warmbox connects with: Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo Mail, Amazon SES, SMTP, Zoho Mail.
Shared Integrations
Both tools integrate with: Gmail, Outlook, SMTP.
Integrations listed only by Growbots: Salesforce, HubSpot, Zapier, IMAP.
Integrations listed only by Warmbox: Google Workspace, Microsoft 365, Yahoo Mail, Amazon SES, Zoho Mail.
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)
- Teams that want to start free and scale up as needs grow
Best Fit for Warmbox
- Budget-conscious teams looking for an affordable email warmup tool
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Feature Comparison Summary
| Feature | Growbots | Warmbox |
|---|---|---|
| Starting Price | Free | $19/mo |
| Top Tier Price | $39/mo | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 7 | 8 |
| 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 Warmbox the email domain warming and deliverability side. Growbots offers a more accessible entry point, while Warmbox starts at $19/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 Warmbox for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Growbots and Warmbox?
- Growbots is a cold email platform built for finding prospects and running outbound email campaigns, while Warmbox is an email warmup tool built for warming up sending domains and improving deliverability. They address different parts of the outbound workflow rather than competing directly, so many teams use both together.
- Which is cheaper, Growbots or Warmbox?
- Growbots is cheaper at the entry level, offering a Freemium plan at $0/mo, while Warmbox's cheapest plan, Solo, costs $19/mo. Growbots's paid tiers, Starter Outreach and Pro Outreach, are priced at $29/mo and $39/mo respectively.
- Does Growbots include email warmup features?
- Yes, Growbots lists Gradual Automatic Warmup as one of its key features alongside prospect database access and email verification on import. However, Warmbox is specifically built around warmup, offering customizable warmup recipes, spam score monitoring, and a real-time analytics dashboard.
- What integrations does each tool support?
- Growbots integrates with Salesforce, HubSpot, Zapier, Gmail, Outlook, SMTP, and IMAP. Warmbox integrates with Gmail, Google Workspace, Outlook, Microsoft 365, Yahoo Mail, Amazon SES, SMTP, and Zoho Mail.
- Should I use both Growbots and Warmbox together?
- Many teams do use both, since Growbots handles sending campaigns and generating replies while Warmbox focuses on building sender reputation and inbox placement. If the priority is campaign performance, Growbots fits; if the priority is deliverability, Warmbox fits, and combining them covers both needs.
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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