Brevo vs Customer.io

What Brevo is

Brevo combines email campaigns, SMS, automation and a light CRM, priced by emails sent rather than contacts stored. Billing by emails sent rather than contacts stored changes the maths for lists with a large inactive tail. The interface is broad rather than deep, so teams running sophisticated lifecycle programmes usually outgrow the automation builder.

What Customer.io is

Customer.io sends messages triggered by what people actually do in your product, across email, push and in-app. Messages fire on product events rather than list membership, which is the difference between lifecycle messaging and a newsletter. It expects you to send it clean event data, so the setup cost lands on engineering before marketing sees value.

What Brevo is built to do

Send-based pricing

Charges for messages sent instead of contacts stored.

Email, SMS and WhatsApp

Runs several channels from the same contact list and automations.

Built-in CRM

Keeps a light contact and deal record without a separate system.

What Customer.io is built to do

Event-triggered messaging

Sends based on in-product behaviour rather than list membership.

Visual workflow builder

Branches journeys on attributes, events and wait conditions.

Multi-channel delivery

Reaches users by email, push, SMS and in-app messages.

Choose Brevo if

• Small businesses with large lists who send occasionally.

Choose Customer.io if

• Product teams that want lifecycle messaging driven by real usage.

Brevo: pros & cons

• Pricing by send volume, not list size
• SMS and email in one platform
• Usable free tier
• Deliverability trails premium providers
• Interface can feel cluttered
• Automation builder is limited on lower tiers

Customer.io: pros & cons

• Behaviour-triggered messaging done properly
• Visual workflow builder
• Works across email, push and SMS
• Requires event data from your product first
• Pricing rises with profile count
• More setup than a plain newsletter tool