Mailarrow vs Warmbox: Cold Email Platform vs Email Warmup Tool Comparison
Compare Mailarrow (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.
Mailarrow is a cold email platform for sending and managing outreach campaigns, while Warmbox is a dedicated email warmup tool for building sender reputation and inbox placement. Mailarrow starts at $39/mo with unlimited warmup and mailboxes; Warmbox starts at $19/mo with AI-powered warmup recipes. Many teams use both together rather than choosing one.
Key takeaways
- Mailarrow's entry plan costs $39/mo for 2,000 active prospects and 6,000 emails, while Warmbox's Solo plan costs $19/mo for 1 inbox warm-up and 50 emails per day.
- Warmbox offers 4 pricing tiers (Solo, Start-up, Growth, Enterprise) compared to Mailarrow's 3 tiers (Basic, Professional, Growth).
- Mailarrow lists 10 features on its own site, including AI Personalization, sending mailbox rotation, and reply tracking, none of which appear on Warmbox's list.
- Warmbox lists features such as a DNS checker for SPF, DKIM, and DMARC, spam score monitoring, and auto-reply simulation that Mailarrow does not list.
- Mailarrow and Warmbox share only Gmail and Outlook as common integrations, while Warmbox additionally connects to Google Workspace, Microsoft 365, Yahoo Mail, Amazon SES, SMTP, and Zoho Mail.
Reviewed and updated September 2, 2026
Mailarrow vs Warmbox: Cold Email Platform vs Email Warmup Tool Comparison
Mailarrow (cold email platform) and Warmbox (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
Mailarrow 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, Mailarrow lists unlimited email warmup and unlimited mailboxes, and Warmbox lists automated email warmup with ai-powered interactions and customizable warmup recipes and strategies.
Warmbox offers a lower entry point at $19/mo compared to Mailarrow at $39/mo.
If your priority is sending campaigns that land in the inbox and generate replies, Mailarrow 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
Mailarrow is Cold email outreach software with email warmup, AI personalization, unlimited sequences and unlimited connected mailboxes. Users bring their own mailboxes and prospect lists; Mailarrow does not sell leads or provide inboxes.
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
Basic
Solo
Mailarrow Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Basic | $39/mo | 2,000 active prospects | 6,000 emails |
| Professional | $59/mo | 20,000 active prospects | 60,000 emails |
| Growth | $99/mo | 50,000 active prospects | 150,000 emails |
Source: Mailarrow 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
Warmbox offers the lower entry point ($19/mo vs $39/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Warmbox offers 4 pricing tiers compared to Mailarrow's 3, giving you more granularity as you scale.
Features Breakdown
- Unlimited Email Warmup
- Unlimited Mailboxes
- AI Personalization
- Sending mailbox rotation
- Detailed campaign analytics
- Bulk Prospects Import
- 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
Mailarrow Key Features
- Unlimited Email Warmup
- Unlimited Mailboxes
- AI Personalization
- Sending mailbox rotation
- Detailed campaign analytics
- Bulk Prospects Import
- Custom properties
- Sending schedules
- Advanced tracking
- Reply tracking
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 Mailarrow
- Unlimited Email Warmup
- Unlimited Mailboxes
- AI Personalization
- Sending mailbox rotation
- Detailed campaign analytics
- Bulk Prospects Import
- Custom properties
- Sending schedules
- Advanced tracking
- Reply tracking
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
Mailarrow Integrations
Mailarrow connects with: Gmail, Outlook, Zoho, Zapier, TrulyInbox.
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.
Integrations listed only by Mailarrow: Zoho, Zapier, TrulyInbox.
Integrations listed only by Warmbox: Google Workspace, Microsoft 365, Yahoo Mail, Amazon SES, SMTP, Zoho Mail.
Use Case Recommendations
Best Fit for Mailarrow
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (10 capabilities listed)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
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 | Mailarrow | Warmbox |
|---|---|---|
| Starting Price | $39/mo | $19/mo |
| Top Tier Price | $99/mo | Contact Sales |
| Total Features Listed | 10 | 8 |
| Integrations | 5 | 8 |
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
Mailarrow serves the cold email outreach side of an outbound stack and Warmbox the email domain warming and deliverability side. Warmbox offers a more accessible entry point at $19/mo, while Mailarrow starts at $39/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 Mailarrow and Warmbox for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Mailarrow and Warmbox?
- Mailarrow is a cold email platform built for sending and managing outreach campaigns, while Warmbox is an email warmup tool focused on building sender reputation and improving inbox placement. They solve different parts of the same outbound challenge, and many teams run both together.
- Which is cheaper, Mailarrow or Warmbox?
- Warmbox has the lower entry price at $19/mo for its Solo plan, compared to Mailarrow's Basic plan at $39/mo. However, Warmbox's higher tiers such as Start-up at $79/mo and Growth at $159/mo can cost more than Mailarrow's equivalent plans as usage scales.
- Do Mailarrow and Warmbox integrate with the same tools?
- They overlap only on Gmail and Outlook. Mailarrow also connects with Zoho, Zapier, and TrulyInbox, while Warmbox connects with a wider range including Google Workspace, Microsoft 365, Yahoo Mail, Amazon SES, SMTP, and Zoho Mail.
- Can I use Mailarrow and Warmbox together?
- Yes, many teams use both tools since they cover different needs. Mailarrow handles sending and managing cold email campaigns, while Warmbox handles warming up mailboxes and monitoring deliverability, so combining them addresses both outreach and inbox placement.
- Does Mailarrow already include email warmup, so do I still need Warmbox?
- Mailarrow lists unlimited email warmup as a built-in feature, but Warmbox offers more specialized warmup capabilities such as customizable warmup recipes, spam score monitoring, blacklist checks, and a DNS checker for SPF, DKIM, and DMARC that Mailarrow does not list.
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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