Mailarrow vs Reply.io: Cold Email Platform Comparison

Mailarrow vs Reply.io: Cold Email Platform Comparison

Mailarrow and Reply.io are both cold email platforms. Choosing between them depends on your team size, budget, and specific cold email outreach requirements. Here is what each vendor publishes about pricing, features, and integrations.

The Quick Answer

By each vendor's own wording, Mailarrow lists unlimited mailboxes and sending mailbox rotation, while Reply.io lists 1 billion b2b contacts database and anti-spam & deliverability suite. A capability both offer can appear under different names, so read both feature lists below.

Mailarrow offers a lower entry point at $39/mo compared to Reply.io at $59/mo.

If your priority is sending campaigns that land in the inbox and generate replies, both tools target it. The right choice depends on your budget, team size, and the specific capabilities you need most.

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.

Reply.io is AI-powered sales engagement platform with 1B+ B2B contacts, multichannel sequences, and AI SDR capabilities.

Both platforms offer unlimited email warmup, ai personalization. Where they diverge is in their approach to pricing tiers and advanced capabilities.

Pricing Comparison

$39/moMailarrow entry plan

Basic

$59/moReply.io entry plan

Email Volume

Mailarrow Pricing (as of September 2026)

Source: Mailarrow Pricing

Reply.io Pricing (as of September 2026)

Source: Reply.io Pricing

Pricing Analysis

Mailarrow is more affordable at the entry level ($39/mo vs $59/mo). For teams with tight budgets or those just getting started with cold email outreach, this price difference matters.

Reply.io offers 4 pricing tiers compared to Mailarrow's 3, giving you more granularity as you scale.

Features Breakdown

Mailarrow lists

• Unlimited Mailboxes
• Sending mailbox rotation
• Detailed campaign analytics
• Bulk Prospects Import
• Custom properties
• Sending schedules
• and 2 more listed below

Both tools

• Unlimited Email Warmup
• AI Personalization

Reply.io lists

• 1 billion B2B contacts database
• Anti-spam & deliverability suite
• LinkedIn automation (add-on)
• SMS and calls (add-on)
• AI SDR capabilities
• Multi-workspace for agencies
• and 1 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

Reply.io Key Features

• Unlimited email warmup
• 1 billion B2B contacts database
• Anti-spam & deliverability suite
• LinkedIn automation (add-on)
• SMS and calls (add-on)
• AI personalization
• AI SDR capabilities
• Multi-workspace for agencies
• 14-day free trial

Shared Capabilities

Both Mailarrow and Reply.io include:

• Unlimited Email Warmup
• AI Personalization

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 Mailboxes
• Sending mailbox rotation
• Detailed campaign analytics
• Bulk Prospects Import
• Custom properties
• Sending schedules
• Advanced tracking
• Reply tracking

Listed only by Reply.io

• 1 billion B2B contacts database
• Anti-spam & deliverability suite
• LinkedIn automation (add-on)
• SMS and calls (add-on)
• AI SDR capabilities
• Multi-workspace for agencies
• 14-day free trial

Integration Ecosystem

Mailarrow Integrations

Mailarrow connects with: Gmail, Outlook, Zoho, Zapier, TrulyInbox.

Reply.io Integrations

Reply.io connects with: HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Zapier, Make, n8n.

Shared Integrations

Both tools integrate with: Zapier.

Integrations listed only by Mailarrow: Gmail, Outlook, Zoho, TrulyInbox.

Integrations listed only by Reply.io: HubSpot, Salesforce, Pipedrive, Copper CRM, Zendesk Sell, Close, Make, n8n.

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 Reply.io

• Organizations with complex tech stacks needing broad integration support (9 integrations)
• Sales teams running high-volume outbound email campaigns
• Agencies managing multiple client outreach programs
• SDR teams focused on pipeline generation

Feature Comparison Summary

Getting Started Checklist

1. Define your cold email outreach requirements and monthly budget
2. Estimate your expected email sending volume to find the right tier
3. List the integrations your team currently relies on
4. Sign up for free trials or demos of both platforms
5. Run a small test with each tool before making a commitment
6. Evaluate the onboarding experience and support quality

Final Thoughts

Mailarrow and Reply.io both serve the cold email outreach market. Mailarrow offers a more accessible entry point at $39/mo, while Reply.io starts at $59/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 Reply.io for current information.