Apollo.io vs Mailarrow: Sales Engagement Platform vs Cold Email Platform Comparison
Compare Apollo.io (sales engagement platform) and Mailarrow (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Apollo.io is a sales engagement platform built for multi-channel outreach across email, phone, and LinkedIn, backed by a 275M+ contact database, with a free entry plan. Mailarrow is a cold email platform focused on deliverability, offering unlimited email warmup and unlimited mailboxes starting at $39/mo. Many teams run both together to cover prospecting and inbox delivery.
Key takeaways
- Apollo.io has a free entry plan while Mailarrow's cheapest plan, Basic, costs $39/mo.
- Apollo.io lists a B2B contact and company database of 275M+ contacts as a core feature.
- Mailarrow lists unlimited email warmup and unlimited mailboxes among its key features.
- Apollo.io offers 4 pricing tiers, Free, Basic at $49/mo, Professional at $79/mo, and Organization at $119/mo, compared to Mailarrow's 3 tiers, Basic at $39/mo, Professional at $59/mo, and Growth at $99/mo.
- Mailarrow integrates with Gmail, Outlook, Zoho, Zapier, and TrulyInbox, while Apollo.io integrates with Salesforce, HubSpot, Pipedrive, LinkedIn, and other tools.
Reviewed and updated September 2, 2026
Apollo.io vs Mailarrow: Sales Engagement Platform vs Cold Email Platform Comparison
Sales teams building an outbound stack often weigh Apollo.io, a sales engagement platform for multi-channel sales outreach and engagement tracking, against Mailarrow, a cold email platform for cold email outreach. 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
Apollo.io is a sales engagement platform for multi-channel sales outreach and engagement tracking; Mailarrow is a cold email platform for cold email outreach. By each vendor's own wording, Apollo.io lists b2b contact and company database (275m+ contacts) and multi-channel sequences (email, phone, linkedin), and Mailarrow lists unlimited email warmup and unlimited mailboxes.
Apollo.io offers a lower entry point at $0/mo compared to Mailarrow at $39/mo.
If your priority is coordinating outreach across email, phone, and social channels, Apollo.io 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
Apollo.io is All-in-one sales intelligence and engagement platform combining a 275M+ contact database with automated sequences, email outreach, dialer, and AI-powered workflows for prospecting at scale.
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
Free
Basic
Apollo.io Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Free | Free | 900 credits per seat per year, granted monthly |
| Basic | $49/mo | 30,000 credits per seat per year, granted upfront |
| Professional | $79/mo | 48,000 credits per seat per year, granted upfront |
| Organization | $119/mo | 72,000 credits per seat per year, granted upfront |
Source: Apollo.io 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
Apollo.io is more affordable at the entry level ($0/mo vs $39/mo). For teams with tight budgets or those just getting started with multi-channel sales outreach and engagement tracking and cold email outreach, this price difference matters.
Apollo.io offers 4 pricing tiers compared to Mailarrow's 3, giving you more granularity as you scale.
Apollo.io includes a free tier, letting you test the platform before committing financially.
Features Breakdown
- B2B contact and company database (275M+ contacts)
- Multi-channel sequences (email, phone, LinkedIn)
- AI-powered email writing and optimization
- Built-in dialer with call recording
- Automated workflows and engagement rules
- A/B testing for email sequences
- and 4 more listed below
- Unlimited Email Warmup
- Unlimited Mailboxes
- AI Personalization
- Sending mailbox rotation
- Detailed campaign analytics
- Bulk Prospects Import
- and 4 more listed below
Apollo.io Key Features
- B2B contact and company database (275M+ contacts)
- Multi-channel sequences (email, phone, LinkedIn)
- AI-powered email writing and optimization
- Built-in dialer with call recording
- Automated workflows and engagement rules
- A/B testing for email sequences
- Buying intent signals and job change alerts
- Advanced lead scoring and filtering
- Email deliverability tools and mailbox rotation
- Conversation intelligence (Professional+)
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 Apollo.io
- B2B contact and company database (275M+ contacts)
- Multi-channel sequences (email, phone, LinkedIn)
- AI-powered email writing and optimization
- Built-in dialer with call recording
- Automated workflows and engagement rules
- A/B testing for email sequences
- Buying intent signals and job change alerts
- Advanced lead scoring and filtering
- Email deliverability tools and mailbox rotation
- Conversation intelligence (Professional+)
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
Apollo.io Integrations
Apollo.io connects with: Salesforce, HubSpot, Pipedrive, Gmail, Microsoft Outlook, LinkedIn, Zapier, Slack, Sendgrid, Outreach, Salesloft, Webhooks API.
Mailarrow Integrations
Mailarrow connects with: Gmail, Outlook, Zoho, Zapier, TrulyInbox.
Shared Integrations
Both tools integrate with: Gmail, Zapier.
Integrations listed only by Apollo.io: Salesforce, HubSpot, Pipedrive, Microsoft Outlook, LinkedIn, Slack, Sendgrid, Outreach, Salesloft, Webhooks API.
Integrations listed only by Mailarrow: Outlook, Zoho, TrulyInbox.
Use Case Recommendations
Best Fit for Apollo.io
- Budget-conscious teams looking for an affordable sales engagement platform
- Organizations with complex tech stacks needing broad integration support (12 integrations)
- Teams that want to start free and scale up as needs grow
Best Fit for Mailarrow
- Budget-conscious teams looking for an affordable cold email platform
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
- SDR teams focused on pipeline generation
Feature Comparison Summary
| Feature | Apollo.io | Mailarrow |
|---|---|---|
| Starting Price | Free | $39/mo |
| Top Tier Price | $119/mo | $99/mo |
| Total Features Listed | 10 | 10 |
| Integrations | 12 | 5 |
| Founded | 2015 | N/A |
Getting Started Checklist
- Define your multi-channel sales outreach and engagement tracking and cold email outreach requirements and monthly budget
- Estimate your expected sequences and engagement actions 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
Apollo.io serves the multi-channel sales outreach and engagement tracking side of an outbound stack and Mailarrow the cold email outreach side. Apollo.io offers a more accessible entry point, 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 Apollo.io and Mailarrow for current information.
Frequently asked questions.
Frequently asked questions- What's the main difference between Apollo.io and Mailarrow?
- Apollo.io is a sales engagement platform for multi-channel outreach and engagement tracking across email, phone, and LinkedIn, paired with a 275M+ contact database. Mailarrow is a cold email platform focused specifically on cold email outreach, with unlimited email warmup and unlimited mailboxes. They cover different parts of an outbound workflow rather than competing directly.
- How much does Apollo.io cost?
- Apollo.io has a free plan, then paid tiers at $49/mo for Basic, $79/mo for Professional, and $119/mo for Organization. Each paid tier increases the annual credits granted per seat, from 30,000 on Basic up to 72,000 on Organization, with credits granted upfront rather than monthly.
- How much does Mailarrow cost?
- Mailarrow's Basic plan costs $39/mo and includes 2,000 active prospects and 6,000 emails. Professional is $59/mo with 20,000 active prospects and 60,000 emails, and Growth is $99/mo with 50,000 active prospects and 150,000 emails.
- Can I use Apollo.io and Mailarrow together?
- Yes, the article notes that many teams run one of each. Apollo.io can handle multi-channel prospecting, contact data, and engagement tracking, while Mailarrow can be used specifically for cold email sending, warmup, and deliverability, since the two platforms address different parts of the outbound workflow.
- What integrations do Apollo.io and Mailarrow support?
- Apollo.io connects with Salesforce, HubSpot, Pipedrive, Gmail, Microsoft Outlook, LinkedIn, Zapier, Slack, Sendgrid, Outreach, Salesloft, and a Webhooks API. Mailarrow connects with Gmail, Outlook, Zoho, Zapier, and TrulyInbox, a narrower set focused on mailbox and warmup connections.
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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