Customer.io Review 2025: Everything You Need to Know
Paid
From $100/mo
G2: 4.4★
Customer.io is behavioral email and messaging for data-driven teams that positions itself for product and growth teams sending behaviour-triggered messages. Founded in 2012, it has become one of the most recognised platforms in the email marketing space. In this review we cover what it does well, where it falls short, and who should actually use it.
Our verdict: Customer.io is a solid choice for product and growth teams sending behaviour-triggered messages. Its paid-only pricing reflects its focus on serious senders. The main trade-off is between its particular strengths and the limitations that make alternatives worth considering for some users.
Pros
- Good fit for product and growth teams sending behaviour-triggered messages
- Competitive pricing starting at $100/mo
- Key feature: Behavioural Triggers
- Mature, well-supported platform
Cons
- Can get expensive at higher subscriber counts
- Learning curve for advanced automations
- Some features locked to higher tiers
Pricing
Customer.io starts at $0/month, with paid plans from $100/month. Pricing typically scales with subscriber count.
Who is Customer.io best for?
Customer.io works best for product and growth teams sending behaviour-triggered messages. If you fit that profile, the feature set aligns well.
Key features
Behavioural TriggersVisual WorkflowTransactional EmailSms MarketingIn-App MessagingApi AccessAnalytics
Frequently asked questions
Is Customer.io free?
Customer.io does not offer a free plan. Paid plans start at $100/month.
What is Customer.io best used for?
Customer.io is best for product and growth teams sending behaviour-triggered messages. Its standout features include behavioural triggers, visual workflow, transactional email.
Is Customer.io good for beginners?
Customer.io is aimed at users with some email marketing experience.
Does Customer.io have an affiliate program?
Customer.io does not currently offer an affiliate program.