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Compare: ConvertKit (now Kit) vs Customer.io
A side-by-side analysis to help you find the right tool.
ConvertKit (now Kit)
Freemium
(Under $50/mo)
Free tier (up to 10,000 subscribers with limited features)
View Details
Customer.io
Paid
($50–$200/mo)
Yes (free trial available)
View Details
Key Differences
Pricing Model
ConvertKit (now Kit)
Freemium
Customer.io
Paid
Budget Tier
ConvertKit (now Kit)
Under $50/mo
Customer.io
$50–$200/mo
Free Trial
ConvertKit (now Kit)
Free tier (up to 10,000 subscribers with limited features)
Customer.io
Yes (free trial available)
Company Size Fit
ConvertKit (now Kit)
Solo / Freelancer, Small Team (2–20)
Customer.io
Small Team (2–20), Mid-Market (20–200)
Target Channels
ConvertKit (now Kit)
Email Lists
Customer.io
Email Lists, Website Visitors, Existing Customers
Best For
ConvertKit (now Kit)
Creators, bloggers, and solopreneurs building audience-based businesses
Customer.io
SaaS and product-led growth (PLG) companies needing event-driven behavioral messaging
Pros
ConvertKit (now Kit)
Built specifically for creators (not retrofitted from an SMB tool)
generous free tier (10K subscribers!)
excellent tagging/segmentation for its price
supports paid newsletters and digital product sales natively
creator network for cross-promotion
Customer.io
Unmatched ability to trigger messages based on exactly what users do *inside* a software product
developer-friendly
excellent visual builder
Cons
ConvertKit (now Kit)
Email design is deliberately minimal (plain-text-style by philosophy)
not suited for e-commerce product emails with heavy visual merchandising
reporting/analytics are basic
no SMS
Customer.io
Requires engineering resources to set up event tracking
not designed for standard B2B lead generation or e-commerce
What They Share
