Mailarrow vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Compare Mailarrow (cold email platform) and Warmup Inbox (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 built for outreach campaigns, offering unlimited email warmup and unlimited mailboxes starting at $39 per month. Warmup Inbox is a dedicated email warmup tool that builds sender reputation using a network of real inboxes, starting at $19 per month. Many teams use both together rather than choosing one.
Key takeaways
- Mailarrow's entry plan costs $39 per month and includes 2,000 active prospects and 6,000 emails, scaling up to $99 per month for 50,000 prospects and 150,000 emails.
- Warmup Inbox's entry plan costs $19 per month for 75 warmup messages per day, rising to $99 per month for 1,000 warmup messages per day.
- Warmup Inbox exchanges natural looking email with a network of more than 30,000 real inboxes to build sender reputation automatically.
- Mailarrow lists 10 features including AI personalization and reply tracking, while Warmup Inbox lists 9 features including language warmup and a developers API.
- Warmup Inbox integrates with 8 platforms including Amazon SES, Mailgun, SendGrid, and Sendinblue, compared to 5 integrations listed by Mailarrow.
Reviewed and updated September 2, 2026
Mailarrow vs Warmup Inbox: Cold Email Platform vs Email Warmup Tool Comparison
Mailarrow is a cold email platform; Warmup Inbox is an email warmup tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: cold email outreach on one side, email domain warming and deliverability on the other. This guide lays out what each vendor publishes.
The Quick Answer
Mailarrow is a cold email platform for cold email outreach; Warmup Inbox 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 Warmup Inbox lists email warmup and cold email sequence.
Warmup Inbox 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 Warmup Inbox. 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.
Warmup Inbox is Email warmup service that exchanges natural-looking email with a network of more than 30,000 real inboxes to build sender reputation automatically. Also offers cold email sequences, language warmup, ESP warmup and IP warmup from the same dashboard.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Basic
Basic
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
Warmup Inbox Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Basic | $19/mo | per inbox | 75 warmup messages/day |
| Pro | $59/mo | per inbox | 250 warmup messages/day |
| Max | $99/mo | per inbox | 1,000 warmup messages/day |
| For agencies & teams | Contact Sales | Custom plans starting at 15 inboxes | custom |
Source: Warmup Inbox Pricing
Pricing Analysis
Warmup Inbox offers the lower entry point ($19/mo vs $39/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Warmup Inbox 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
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- and 3 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
Warmup Inbox Key Features
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- Email reputation Check
- Human-like AI generated content
- Developers API
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 Warmup Inbox
- Email warmup
- Cold email sequence
- Language warmup
- ESP warmup tool
- IP warmup
- Spam & Category monitoring
- Email reputation Check
- Human-like AI generated content
- Developers API
Integration Ecosystem
Mailarrow Integrations
Mailarrow connects with: Gmail, Outlook, Zoho, Zapier, TrulyInbox.
Warmup Inbox Integrations
Warmup Inbox connects with: Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), Any inbox with SMTP.
Integrations listed only by Mailarrow: Gmail, Outlook, Zoho, Zapier, TrulyInbox.
Integrations listed only by Warmup Inbox: Gmail & Workspace, Outlook & Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), Any inbox with SMTP.
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 Warmup Inbox
- 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 | Warmup Inbox |
|---|---|---|
| Starting Price | $39/mo | $19/mo |
| Top Tier Price | $99/mo | Contact Sales |
| Total Features Listed | 10 | 9 |
| 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 Warmup Inbox the email domain warming and deliverability side. Warmup Inbox 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 Warmup Inbox for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Mailarrow and Warmup Inbox?
- Mailarrow is a cold email platform built for sending outreach campaigns, while Warmup Inbox is an email warmup tool focused on building sender reputation and inbox placement. Mailarrow includes unlimited email warmup and unlimited mailboxes as part of its outreach features, while Warmup Inbox centers on warming email domains using a large network of real inboxes.
- Which tool is cheaper, Mailarrow or Warmup Inbox?
- Warmup Inbox has the lower entry price at $19 per month compared to Mailarrow's $39 per month entry plan. Warmup Inbox also offers four pricing tiers, including a custom agency plan starting at 15 inboxes, while Mailarrow offers three tiers up to $99 per month.
- Can I use Mailarrow and Warmup Inbox together?
- Yes, the article notes that many teams run one of each since they serve different parts of the same workflow. Mailarrow handles cold email outreach and campaign sending, while Warmup Inbox handles email domain warming and deliverability, so they can complement rather than replace each other.
- What integrations does Warmup Inbox support?
- Warmup Inbox connects with Gmail and Workspace, Outlook and Microsoft 365, Zoho Mail, Amazon SES, Mailgun, SendGrid, Sendinblue (Brevo), and any inbox with SMTP, totaling 8 listed integrations. This is a broader integration list than Mailarrow's 5 listed connections.
- Who should choose Mailarrow over Warmup Inbox?
- According to the article, Mailarrow best fits budget-conscious teams needing an affordable cold email platform, teams wanting a wide feature set of 10 listed capabilities, sales teams running high-volume outbound campaigns, and agencies managing multiple client outreach programs.
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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