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Brevo (formerly Sendinblue) vs Customer.io Comparison · CTFM
Compare: Brevo (formerly Sendinblue) vs Customer.io
A side-by-side analysis to help you find the right tool.
Brevo (formerly Sendinblue)
Freemium
(Under $50/mo)
Free tier (300 emails/day, unlimited contacts)
View Details
Customer.io
Paid
($50–$200/mo)
Yes (free trial available)
View Details
Key Differences
Pricing Model
Brevo (formerly Sendinblue)
Freemium
Customer.io
Paid
Budget Tier
Brevo (formerly Sendinblue)
Under $50/mo
Customer.io
$50–$200/mo
Free Trial
Brevo (formerly Sendinblue)
Free tier (300 emails/day, unlimited contacts)
Customer.io
Yes (free trial available)
Company Size Fit
Brevo (formerly Sendinblue)
Solo / Freelancer, Small Team (2–20), Mid-Market (20–200)
Customer.io
Small Team (2–20), Mid-Market (20–200)
Business Type Fit
Brevo (formerly Sendinblue)
B2B, B2C, D2C / E-commerce
Customer.io
B2B, B2C
Target Channels
Brevo (formerly Sendinblue)
Email Lists
Customer.io
Email Lists, Website Visitors, Existing Customers
Best For
Brevo (formerly Sendinblue)
Budget-conscious businesses wanting email + SMS + basic CRM combined
Customer.io
SaaS and product-led growth (PLG) companies needing event-driven behavioral messaging
Pros
Brevo (formerly Sendinblue)
Volume based pricing models provide significant cost savings for organizations managing large contact databases with lower sending frequencies.
Generous free tier allows early stage companies to test campaigns and build foundational marketing sequences at zero initial software cost.
Integrated multi-channel messaging capabilities span email, SMS, and WhatsApp natively within one unified platform.
Transactional email infrastructure is included directly within the core offering to support essential system notifications.
Customer.io
Unmatched capability to trigger messaging directly from in-app user actions
Developer-friendly infrastructure for seamless data integration
Intuitive visual workflow builder for complex lifecycle campaigns
Cons
Brevo (formerly Sendinblue)
Workflow automation builder offers fewer advanced conditional branching options compared to enterprise alternatives.
Deliverability performance has occasionally required closer monitoring during periods of high volume scaling.
User interface lacks the refined aesthetic polish found in competing market solutions.
Customer.io
Requires dedicated engineering resources for proper event tracking setup
Not optimized for traditional inbound B2B lead generation or retail e-commerce
What They Share
