CheckMX alternatives

Tools that do what CheckMX does, found by what they say they do rather than by shelf. Among the equally alike, the most used come first. Each line says how it differs from CheckMX.

Read 2026-11-02 · CheckMX itself: Free plan · From $37/mo

With a free plan or free to use: Snov, AlienMail, Warmerly, Reply.io.

10 alternativesUnlike CheckMX

#1
Emailchaser Sales MCP · open
Sends cold email campaigns from many connected mailboxes, rotating sends, checking lead addresses, and gathering all replies into one inbox.
Costs moreOwn MCP server
5.1k
Active
From $47/mo
#2
Snov Sales MCP · sign-in
Finds sales leads, verifies and enriches their emails and phone numbers, and runs automated email and LinkedIn outreach sequences.
More widely used
43.4k
Active
From $39/mo
2012
#3
AlienMail Sales
Sends cold outreach email campaigns from connected Gmail, Outlook or SMTP inboxes, with automated mailbox warmup and deliverability monitoring.
More widely used
2
Active
From $5 per use
#4
Smartlead Sales MCP · sign-in
Sends cold emails at scale with AI assistance, lead verification, and deliverability infrastructure.
More widely used
16.9k
Active
From $39/mo
#5
Warmerly Sales MCP · sign-in
Warms email mailboxes to build sender reputation, then sends personalised cold email and LinkedIn sequences from them into one shared inbox.
CheaperMore widely used
46
Active
From $19/mo
2026
#6
Reply.io Sales
Sends personalized cold emails and LinkedIn messages at scale with AI-generated sequences and automated follow-ups.
Also: AgentsMore widely used
36.2k
From $49/user/mo
2014
#7
Instantly Sales MCP · sign-in
Finds leads, creates and sends personalized cold email campaigns, and automates sales outreach at scale.
Costs moreAlso: Agents
57.6k
Active
From $47/mo
2019
#8
Apollo.io Sales MCP · sign-in
Searches a database of B2B contacts and companies, enriches CRM records, and sends email sequences and dials prospects from one sales platform.
Also: Agents, Data extractionMore widely used
108k
Active
2015
#9
Enginy Sales MCP · sign-in
Finds and enriches sales prospects from a plain-language description, then runs email and social outreach sequences and drafts replies in one inbox.
Also: Data extraction, SearchMore widely used
4.6k
Contact sales
#10
OnePageCRM Sales MCP · sign-in
Tracks sales follow-ups, deals and email sends for small-business contacts in a cloud CRM with Gmail, Outlook and calendar sync.
More widely used
61.5k
Active
From $9.95/user/mo
2010

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How this list is made: the words CheckMX is described with (what it does, for whom, what it is used for) are matched against every tool in the Atlas. A tool on the same shelf, or doing the same kind of work, counts for a little more. Nothing here is paid for.