Inbox Warmup vs Mailarrow: Email Warmup Tool vs Cold Email Platform Comparison
Compare Inbox Warmup (email warmup tool) and Mailarrow (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Compare Inbox Warmup (email warmup tool) and Mailarrow (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Reviewed and updated September 4, 2026
Inbox Warmup vs Mailarrow: Email Warmup Tool vs Cold Email Platform Comparison
Inbox Warmup (email warmup tool) and Mailarrow (cold email platform) 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
Inbox Warmup is an email warmup tool for email domain warming and deliverability; Mailarrow is a cold email platform for cold email outreach. By each vendor's own wording, Inbox Warmup lists smtp diagnostics and dns authentication, and Mailarrow lists unlimited email warmup and unlimited mailboxes.
Both start at the same price point ($39/mo), so the decision comes down to features and workflow fit.
If your priority is building sender reputation and improving inbox placement, Inbox Warmup is the one built for it; for sending campaigns that land in the inbox and generate replies, that is Mailarrow. Many teams run one of each.
Understanding the Core Difference
Inbox Warmup is Inbox warm-up and sender reputation platform that connects SMTP infrastructure, authenticates sending domains (SPF, DKIM, DMARC), increases activity gradually, monitors reputation signals and enforces hourly and monthly sending limits from one dashboard.
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.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Inbox Warmup Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Launch | $39/mo | Not published per mailbox; plans are sized by credits | 5,000 credits and 75 emails/hour |
| Growth | $99/mo | Not published per mailbox; plans are sized by credits | 20,000 credits and 200 emails/hour |
| Professional | $199/mo | Not published per mailbox; plans are sized by credits | 100,000 credits and 500 emails/hour |
| Agency | Contact Sales | Custom credits | Custom credits and support through live chat |
Source: Inbox Warmup Pricing
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
Pricing Analysis
Both platforms start at the same $39/mo price point. The decision comes down to which feature set and tier structure works better for your expected usage.
Inbox Warmup offers 4 pricing tiers compared to Mailarrow's 3, giving you more granularity as you scale.
Features Breakdown
- SMTP diagnostics
- DNS authentication
- Smart warmup
- Reputation Center
- Campaign controls
- Admin-managed SMTP
- and 1 more listed below
- Unlimited Email Warmup
- Unlimited Mailboxes
- AI Personalization
- Sending mailbox rotation
- Detailed campaign analytics
- Bulk Prospects Import
- and 4 more listed below
Inbox Warmup Key Features
- SMTP diagnostics
- DNS authentication
- Smart warmup
- Reputation Center
- Campaign controls
- Admin-managed SMTP
- Free Tools
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
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 Inbox Warmup
- SMTP diagnostics
- DNS authentication
- Smart warmup
- Reputation Center
- Campaign controls
- Admin-managed SMTP
- Free Tools
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
Integration Ecosystem
Inbox Warmup Integrations
Inbox Warmup connects with: SMTP.
Mailarrow Integrations
Mailarrow connects with: Gmail, Outlook, Zoho, Zapier, TrulyInbox.
Integrations listed only by Inbox Warmup: SMTP.
Integrations listed only by Mailarrow: Gmail, Outlook, Zoho, Zapier, TrulyInbox.
Use Case Recommendations
Best Fit for Inbox Warmup
- Budget-conscious teams looking for an affordable email warmup tool
- Enterprise buyers who prefer custom pricing and dedicated support
- Teams launching new email domains for outreach
- Organizations recovering from deliverability issues
Best Fit for Mailarrow
- 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 (5 integrations)
Feature Comparison Summary
| Feature | Inbox Warmup | Mailarrow |
|---|---|---|
| Starting Price | $39/mo | $39/mo |
| Top Tier Price | Contact Sales | $99/mo |
| Total Features Listed | 7 | 10 |
| Integrations | 1 | 5 |
Getting Started Checklist
- Define your email domain warming and deliverability and cold email outreach requirements and monthly budget
- Estimate your expected warmup email volume and email sending 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
Inbox Warmup serves the email domain warming and deliverability side of an outbound stack and Mailarrow the cold email outreach side. Inbox Warmup offers a more accessible entry point at $39/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 Inbox Warmup and Mailarrow for current information.
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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