Closely vs MailRush.io: Sales Engagement Platform vs Cold Email Platform Comparison
Compare Closely (sales engagement platform) and MailRush.io (cold email platform) side by side. See pricing, features, and integrations to decide which one, or both, your stack needs.
Closely is a sales engagement platform for multichannel outreach across LinkedIn and email, priced from $49/mo, while MailRush.io is a cold email platform for cold email outreach with unlimited senders and warming, priced from $19/mo. Teams needing cross-channel coordination should pick Closely; teams focused on inbox deliverability and reply generation should pick MailRush.io. Many teams use both.
Key takeaways
- Closely's Starter plan costs $49/mo and includes 1 LinkedIn account with unlimited email accounts.
- MailRush.io's Starter plan costs $19/mo and allows up to 1,000 contacts with up to 5,000 emails per month.
- Closely offers four pricing tiers: Starter, Growth, Essential, and Custom, compared to MailRush.io's three tiers: Starter, Pro, and Scale.
- Closely integrates with Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, and Webhooks.
- MailRush.io integrates with SMTP, IMAP, Zapier, and Webhooks, and both tools share SMTP and Webhooks integrations.
Reviewed and updated September 5, 2026
Closely vs MailRush.io: Sales Engagement Platform vs Cold Email Platform Comparison
Sales teams building an outbound stack often weigh Closely, a sales engagement platform for multi-channel sales outreach and engagement tracking, against MailRush.io, 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
Closely is a sales engagement platform for multi-channel sales outreach and engagement tracking; MailRush.io is a cold email platform for cold email outreach. By each vendor's own wording, Closely lists multichannel campaigns across linkedin and email and conditional sequence builder, and MailRush.io lists unlimited senders and unlimited email warming.
MailRush.io offers a lower entry point at $19/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 sending campaigns that land in the inbox and generate replies, that is MailRush.io. 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.
MailRush.io is Cold email software that automates outreach and multi-step follow-ups from your own SMTP/IMAP mailboxes or MailRush-provided sending accounts. Email warmup and email validation are included in every plan.
The two platforms take different approaches to solving the same core challenge.
Pricing Comparison
Starter
Starter
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
MailRush.io Pricing (as of September 2026)
| Plan | Price | Contacts | Emails |
|---|---|---|---|
| Starter | $19/mo | Up to 1,000 contacts | Up to 5,000 emails per month; up to 1,000 emails per day |
| Pro | $39/mo | Up to 30,000 contacts | Up to 10,000 emails per month; up to 1,500 emails per day |
| Scale | $99/mo | Up to 50,000 contacts | Up to 25,000 emails per month; up to 3,000 emails per day |
Source: MailRush.io Pricing
Pricing Analysis
MailRush.io offers the lower entry point ($19/mo vs $49/mo). Teams watching their budget will appreciate the savings, especially when starting out.
Closely offers 4 pricing tiers compared to MailRush.io's 3, giving you more granularity as you scale.
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
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- and 5 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
MailRush.io Key Features
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
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 MailRush.io
- Unlimited senders
- Unlimited email warming
- Email validation
- API access & Webhooks
- Zapier integrations
- Spintax support
- Email follow-ups
- Suppression list
- Email copy spam assessment
- Email personalization
- Unsubscription automation
Integration Ecosystem
Closely Integrations
Closely connects with: Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, Webhooks.
MailRush.io Integrations
MailRush.io connects with: SMTP, IMAP, Zapier, Webhooks.
Shared Integrations
Both tools integrate with: SMTP, Webhooks.
Integrations listed only by Closely: Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook.
Integrations listed only by MailRush.io: IMAP, Zapier.
Use Case Recommendations
Best Fit for Closely
- Budget-conscious teams looking for an affordable sales engagement platform
- Organizations with complex tech stacks needing broad integration support (8 integrations)
- Enterprise buyers who prefer custom pricing and dedicated support
Best Fit for MailRush.io
- Budget-conscious teams looking for an affordable cold email platform
- Teams that need a wide feature set (11 capabilities listed)
- Sales teams running high-volume outbound email campaigns
- Agencies managing multiple client outreach programs
Feature Comparison Summary
| Feature | Closely | MailRush.io |
|---|---|---|
| Starting Price | $49/mo | $19/mo |
| Top Tier Price | Contact Sales | $99/mo |
| Total Features Listed | 10 | 11 |
| Integrations | 8 | 4 |
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
Closely serves the multi-channel sales outreach and engagement tracking side of an outbound stack and MailRush.io the cold email outreach side. MailRush.io offers a more accessible entry point at $19/mo, 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 MailRush.io for current information.
Frequently asked questions.
Frequently asked questions- What is the main difference between Closely and MailRush.io?
- Closely is a sales engagement platform built for multichannel sales outreach across LinkedIn and email with engagement tracking, while MailRush.io is a cold email platform focused specifically on cold email outreach, including unlimited email warming and validation on every plan.
- Which is cheaper, Closely or MailRush.io?
- MailRush.io has the lower entry price at $19/mo compared to Closely's $49/mo Starter plan. MailRush.io's Pro plan is $39/mo and Scale is $99/mo, while Closely's higher tiers are Growth at $127/mo and Essential at $205/mo.
- Can I use both Closely and MailRush.io together?
- Yes, the article notes that many teams run one of each since they serve different parts of an outbound workflow. Closely handles multichannel coordination across email, phone, and social, while MailRush.io focuses on getting cold email campaigns into the inbox and generating replies.
- Does Closely support LinkedIn outreach?
- Yes, Closely runs automated campaigns across LinkedIn and email from a shared sender, and includes features like LinkedIn account warmup, a dedicated residential IP for each LinkedIn account, and export capabilities from Sales Navigator, LinkedIn posts, and events.
- What integrations does MailRush.io offer compared to Closely?
- MailRush.io connects with SMTP, IMAP, Zapier, and Webhooks, while Closely connects with Salesforce, Pipedrive, HubSpot, GoHighLevel, Gmail, Microsoft Outlook, SMTP, and Webhooks. The two platforms share SMTP and Webhooks as common integrations.
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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