Closely vs MailerCheck: Sales Engagement Platform vs Data Enrichment Tool Comparison
Compare Closely (sales engagement platform) and MailerCheck (data enrichment tool) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Closely is a sales engagement platform built for multichannel outreach across LinkedIn and email, priced from $49/mo, while MailerCheck is a data enrichment tool built for email list verification and deliverability testing, starting free with pay as you go credits at $0.01 per credit. Teams needing outreach coordination should choose Closely; teams needing contact data accuracy should choose MailerCheck.
Key takeaways
- Closely's Starter plan costs $49/mo and includes 1 LinkedIn account with unlimited email accounts.
- MailerCheck gives new accounts 10 free credits for Email List Verification only, then moves to pay as you go pricing at $0.01 per credit.
- Closely offers 4 pricing tiers, from Starter at $49/mo up to a Custom plan with unlimited seats, while MailerCheck offers 2 pricing options.
- Closely integrates with Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, and Webhooks.
- MailerCheck integrates with MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit, Zapier, and Make.
Reviewed and updated September 4, 2026
Closely vs MailerCheck: Sales Engagement Platform vs Data Enrichment Tool Comparison
Closely is a sales engagement platform; MailerCheck is a data enrichment tool. Whether you need one, the other, or both depends on which part of the workflow you are buying for: multi-channel sales outreach and engagement tracking on one side, B2B lead data and contact enrichment on the other. This guide lays out what each vendor publishes.
The Quick Answer
Closely is a sales engagement platform for multi-channel sales outreach and engagement tracking; MailerCheck is a data enrichment tool for B2B lead data and contact enrichment. By each vendor's own wording, Closely lists multichannel campaigns across linkedin and email and conditional sequence builder, and MailerCheck lists email list verification and email insights.
MailerCheck offers a lower entry point at $0/mo compared to Closely at $49/mo.
If your priority is coordinating outreach across email, phone, and social channels, Closely is the one built for it; for finding accurate contact data for target accounts, that is MailerCheck. Many teams run one of each.
Understanding the Core Difference
Closely is Outbound platform that runs automated campaigns across LinkedIn and email from a shared sender, with a conditional sequence builder, unified inbox, contact enrichment and AI personalization agents.
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
Starter
Free credits
Closely Pricing (as of September 2026)
| Plan | Price | Contacts |
|---|---|---|
| Starter | $49/mo | 1 LinkedIn account, unlimited email accounts |
| Growth | $127/mo | 3 LinkedIn accounts, unlimited email accounts, 3,000 bonus credits/mo |
| Essential | $205/mo | 5 LinkedIn accounts, unlimited email accounts, 5,000 bonus credits/mo |
| Custom | Contact Sales | Unlimited seats, custom LinkedIn accounts and credits |
Source: Closely 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
MailerCheck offers the lower entry point ($0/mo vs $49/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Closely offers 4 pricing tiers compared to MailerCheck's 2, giving you more granularity as you scale.
MailerCheck includes a free tier, which is helpful for evaluating the platform without upfront cost.
Features Breakdown
- Multichannel campaigns across LinkedIn and email
- Conditional sequence builder
- Smart Inbox unifying LinkedIn and email replies
- LinkedIn account warmup
- Dedicated residential IP for each LinkedIn account
- OAuth Gmail and Outlook connection plus custom SMTP
- 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
Closely Key Features
- Multichannel campaigns across LinkedIn and email
- Conditional sequence builder
- Smart Inbox unifying LinkedIn and email replies
- LinkedIn account warmup
- Dedicated residential IP for each LinkedIn account
- OAuth Gmail and Outlook connection plus custom SMTP
- Email finder with a multi-step fallback process
- Phone number finder
- AI lead scoring and personalization agents
- Export from Sales Navigator, LinkedIn posts and events
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 Closely
- Multichannel campaigns across LinkedIn and email
- Conditional sequence builder
- Smart Inbox unifying LinkedIn and email replies
- LinkedIn account warmup
- Dedicated residential IP for each LinkedIn account
- OAuth Gmail and Outlook connection plus custom SMTP
- Email finder with a multi-step fallback process
- Phone number finder
- AI lead scoring and personalization agents
- Export from Sales Navigator, LinkedIn posts and events
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
Closely Integrations
Closely connects with: Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, Webhooks.
MailerCheck Integrations
MailerCheck connects with: MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit, Zapier, Make.
Integrations listed only by Closely: Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, Webhooks.
Integrations listed only by MailerCheck: MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit, Zapier, Make.
Use Case Recommendations
Best Fit for Closely
- Budget-conscious teams looking for an affordable sales engagement platform
- Teams that need a wide feature set (10 capabilities listed)
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
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 | Closely | MailerCheck |
|---|---|---|
| Starting Price | $49/mo | Free |
| Top Tier Price | Contact Sales | Usage-based |
| Total Features Listed | 10 | 8 |
| Integrations | 8 | 7 |
Getting Started Checklist
- Define your multi-channel sales outreach and engagement tracking and B2B lead data and contact enrichment requirements and monthly budget
- Estimate your expected sequences and engagement actions and 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
Closely serves the multi-channel sales outreach and engagement tracking side of an outbound stack and MailerCheck the B2B lead data and contact enrichment side. MailerCheck offers a more accessible entry point, while Closely starts at $49/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 Closely and MailerCheck for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Closely and MailerCheck?
- Closely is a sales engagement platform for multi-channel outreach and engagement tracking across LinkedIn and email, while MailerCheck is a data enrichment tool for B2B lead data and email list verification. Closely focuses on running and tracking outreach campaigns, whereas MailerCheck focuses on validating contact and email data before or during a send.
- Which tool is cheaper, Closely or MailerCheck?
- MailerCheck has the lower entry point, starting free with 10 free credits for Email List Verification, compared to Closely's Starter plan at $49/mo. After the free credits, MailerCheck moves to pay as you go pricing at $0.01 per credit, so ongoing cost depends on usage.
- Can I use Closely and MailerCheck together?
- Yes, the article notes that many teams run one of each since they serve different parts of the workflow. Closely handles multichannel outreach across LinkedIn, email, and phone, while MailerCheck handles finding and verifying accurate contact data for target accounts.
- What integrations does Closely support?
- Closely connects with Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, and Webhooks. These integrations support CRM syncing and email account connections for its multichannel outreach campaigns.
- Does MailerCheck offer a free plan?
- Yes, MailerCheck gives new accounts 10 free credits usable for Email List Verification only. Beyond that, it switches to a pay as you go model starting at 1,000 credits for the entry step, priced at $0.01 per credit, where 1 credit equals 1 email 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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