Apollo.io vs MailerCheck: Data Enrichment Tool Comparison
Compare Apollo.io and MailerCheck side by side. See pricing, features, and integrations to choose the right data enrichment tool for your needs.
Apollo.io is an all-in-one sales intelligence platform listing 210 million plus contacts and 30 million plus companies, priced from free to 119 dollars per month across four tiers. MailerCheck is an email list verification and deliverability tool priced from free to usage based verification at 0.01 dollars per credit. Both start free.
Key takeaways
- Apollo.io's Free plan grants 900 credits per seat per year, while its Organization tier costs $119/mo for 72,000 credits per seat per year.
- MailerCheck gives 10 free credits on a new account and then charges usage-based pricing at $0.01 per credit for email list verification.
- Apollo.io lists 10 features on its own page, including a 210M+ contacts database and AI-powered multichannel campaigns.
- MailerCheck lists 8 features, including email list verification, inbox placement testing, and real-time API verification.
- Apollo.io offers 4 pricing tiers compared to MailerCheck's 2, and both platforms integrate with 7 named tools each.
Reviewed and updated September 5, 2026
Apollo.io vs MailerCheck: Data Enrichment Tool Comparison
If you are comparing B2B lead data and contact enrichment tools, Apollo.io and MailerCheck will likely both appear on your radar. They share some surface-level similarities, but the details reveal important differences in pricing, capability, and target audience.
The Quick Answer
By each vendor's own wording, Apollo.io lists 210m+ contacts database and 30m+ companies, while MailerCheck lists email list verification and email insights. A capability both offer can appear under different names, so read both feature lists below.
Both start at the same price point ($0/mo), so the decision comes down to features and workflow fit.
If your priority is finding accurate contact data for target accounts, both tools target it. The right choice depends on your budget, team size, and the specific capabilities you need most.
Understanding the Core Difference
Apollo.io is All-in-one sales intelligence platform with 210M+ contacts, AI-powered campaigns, and built-in email sequencing.
MailerCheck is Email list verification and deliverability testing tool that validates single addresses, bulk lists or new signups through an API, and tests email content and inbox placement before a send.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
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
MailerCheck Pricing (as of September 2026)
| Plan | Price | Emails |
|---|---|---|
| Free credits | Free | 10 free credits on a new account, for Email List Verification only |
| Pay as you go | Usage-based | 1,000 credits at the entry step, at $0.01 per credit; 1 credit = 1 email verification |
Source: MailerCheck Pricing
Pricing Analysis
Both platforms start at the same $0/mo price point. The decision comes down to which feature set and tier structure works better for your expected usage.
Apollo.io offers 4 pricing tiers compared to MailerCheck's 2, giving you more granularity as you scale.
Both platforms offer free tiers, so you can test each one before spending anything.
Features Breakdown
- 210M+ contacts database
- 30M+ companies
- AI-powered multichannel campaigns
- Email deliverability guardrails
- Anonymous visitor identification
- Real-time form enrichment
- and 4 more listed below
- Email list verification
- Email Insights
- Inbox Placement
- Real-time API verification
- Usage report
- Single address verification
- and 2 more listed below
Apollo.io Key Features
- 210M+ contacts database
- 30M+ companies
- AI-powered multichannel campaigns
- Email deliverability guardrails
- Anonymous visitor identification
- Real-time form enrichment
- Contact and company enrichment
- Advanced filtering
- CRM data cleansing
- Pipeline boards
MailerCheck Key Features
- Email list verification
- Email Insights
- Inbox Placement
- Real-time API verification
- Usage report
- Single address verification
- Credits and autopay
- Statuses
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
- 210M+ contacts database
- 30M+ companies
- AI-powered multichannel campaigns
- Email deliverability guardrails
- Anonymous visitor identification
- Real-time form enrichment
- Contact and company enrichment
- Advanced filtering
- CRM data cleansing
- Pipeline boards
Listed only by MailerCheck
- Email list verification
- Email Insights
- Inbox Placement
- Real-time API verification
- Usage report
- Single address verification
- Credits and autopay
- Statuses
Integration Ecosystem
Apollo.io Integrations
Apollo.io connects with: Salesforce, HubSpot, Outreach, SalesLoft, Marketo, SendGrid, LinkedIn.
MailerCheck Integrations
MailerCheck connects with: MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit, Zapier, Make.
Integrations listed only by Apollo.io: Salesforce, HubSpot, Outreach, SalesLoft, Marketo, SendGrid, LinkedIn.
Integrations listed only by MailerCheck: MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit, Zapier, Make.
Use Case Recommendations
Best Fit for Apollo.io
- Budget-conscious teams looking for an affordable data enrichment tool
- Teams that need a wide feature set (10 capabilities listed)
- Teams that want to start free and scale up as needs grow
Best Fit for MailerCheck
- Budget-conscious teams looking for an affordable data enrichment tool
- Teams that want to start free and scale up as needs grow
- Revenue operations teams building targeted prospect lists
- Marketing teams enriching CRM data for segmentation
Feature Comparison Summary
| Feature | Apollo.io | MailerCheck |
|---|---|---|
| Starting Price | Free | Free |
| Top Tier Price | $119/mo | Usage-based |
| Total Features Listed | 10 | 8 |
| Integrations | 7 | 7 |
Getting Started Checklist
- Define your B2B lead data and contact enrichment requirements and monthly budget
- Estimate your expected data credits or contact lookups 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 and MailerCheck both serve the B2B lead data and contact enrichment market. Apollo.io offers a more accessible entry point, while MailerCheck starts at $0/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 MailerCheck for current information.
Frequently asked questions.
Frequently asked questions- Is Apollo.io or MailerCheck better for B2B contact data enrichment?
- It depends on the use case. Apollo.io is built as an all-in-one sales intelligence platform with a 210M+ contacts database, AI-powered campaigns, and CRM enrichment, making it fit for teams needing a broad feature set. MailerCheck focuses specifically on email list verification and deliverability testing, making it fit for teams whose main need is validating email addresses before sending.
- How much does Apollo.io cost?
- Apollo.io has a free plan offering 900 credits per seat per year, then paid tiers at $49/mo for 30,000 credits, $79/mo for 48,000 credits, and $119/mo for 72,000 credits per seat per year. These credits are granted upfront on the paid tiers rather than monthly.
- How much does MailerCheck cost?
- MailerCheck offers 10 free credits on a new account for email list verification only, then moves to pay-as-you-go pricing starting at 1,000 credits for $0.01 per credit, where 1 credit equals 1 email verification.
- What integrations does each tool support?
- Apollo.io connects with Salesforce, HubSpot, Outreach, SalesLoft, Marketo, SendGrid, and LinkedIn. MailerCheck connects with MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit, Zapier, and Make. Each platform lists 7 integrations, though the tools themselves differ based on each vendor's target workflow.
- Which tool is best for email list verification?
- MailerCheck is built specifically for this purpose, listing email list verification, inbox placement testing, real-time API verification, and single address verification among its core features. Apollo.io also lists email deliverability guardrails as one of its features, but its primary focus is sales intelligence and contact enrichment rather than dedicated list verification.
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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