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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)
Genuinely usable free tier
pricing based on email VOLUME not contacts (huge cost advantage for large but low-frequency lists)
multi-channel (email + SMS + WhatsApp) at a low price
transactional email included
Customer.io
Unmatched ability to trigger messages based on exactly what users do *inside* a software product
developer-friendly
excellent visual builder
Cons
Brevo (formerly Sendinblue)
Automation builder is less sophisticated than ActiveCampaign
deliverability reputation has been mixed historically
UX isn't as polished as Mailchimp
e-commerce features are weaker than Klaviyo
Customer.io
Requires engineering resources to set up event tracking
not designed for standard B2B lead generation or e-commerce
What They Share
