Customer.io vs Mailshake (Outreach): Complete Comparison (2026)
Updated: March 7, 20268 min read
VS
Quick Comparison
Customer.io
Mailshake (Outreach)
Starting Price
$100/mo
$29/user/mo
Free Plan
No
No
Users
7.5K+ orgs
75K+
Founded
2012
2015
Rating
4.7/5
4.4/5
Best For
SaaS companies sending complex behavior-triggered ...
SDRs and sales teams running high-volume cold outr...
Feature-by-Feature Comparison
Customer.ioMailshake (Outreach)
93Ease of Use87
98Features92
92Value for Money86
89Customer Support83
91Integrations85
92Mobile App86
AI Verdict
Customer.io leads with a ToolScout Score of 94 vs 88 for Mailshake (Outreach). Customer.io is best suited for SaaS companies sending complex behavior-triggered lifecycle emails, while Mailshake (Outreach) excels for SDRs and sales teams running high-volume cold outreach campaigns. Both are strong options in the Marketing Automation space.
CHOOSE CUSTOMER.IO IF:
SaaS companies sending complex behavior-triggered lifecycle emails.
CHOOSE MAILSHAKE (OUTREACH) IF:
SDRs and sales teams running high-volume cold outreach campaigns.
Frequently Asked Questions
Is Customer.io better than Mailshake (Outreach)?
Customer.io scores 94/100 on ToolScout compared to Mailshake (Outreach)'s 88/100. However, the best choice depends on your specific needs. Customer.io is best for SaaS companies sending complex behavior-triggered lifecycle emails. Mailshake (Outreach) is best for SDRs and sales teams running high-volume cold outreach campaigns.
Does Customer.io have a free plan?
No, Customer.io does not offer a free plan. Plans start from $100/mo.
Does Mailshake (Outreach) have a free plan?
No, Mailshake (Outreach) does not offer a free plan. Plans start from $29/user/mo.
Can I migrate from Customer.io to Mailshake (Outreach)?
Migration between Customer.io and Mailshake (Outreach) depends on the specific features you use. Both tools are in the Marketing Automation category. Check each tool's import/export options for data portability before switching.