Marketing · Email marketing and automation
Customer.io
Data-driven messaging platform for behaviour-triggered lifecycle campaigns
At a glance
Customer.io is a customer engagement platform that sends automated messages based on what people do in your product or website. You send it event and profile data, build segments, and design journeys in a visual workflow builder that trigger email, SMS, push, in-app and WhatsApp messages. It also includes data integrations, reverse ETL and an AI agent that can draft automations from a prompt.
- Category
- Email marketing and automation
- Best fit
- Mid-market · Enterprise
- Pricing
- See pricing below
- In Adam’s stack
- No
Who Customer.io is best for
SaaS, apps and digital businesses with product usage data and a growth or lifecycle team that wants onboarding, activation and retention messaging. Pick it over newsletter-style email tools when messages need to fire on real-time user behaviour.
Key features
- Visual journey builder with event and API-triggered campaigns
- Email, SMS, push, in-app and WhatsApp messaging
- Segments, custom objects and an AI-assisted segment builder
- Data integrations including reverse ETL and warehouse sync
- Drag-and-drop and code-based message design studio
- US or EU data centre choice
Why it’s worth it
It lets you message customers based on exactly what they have or haven't done in your product, which is far more relevant than calendar-based email blasts.
Things to consider
- It relies on clean event data from your product, so you usually need developer help to set up tracking
- Premium starts at US$1,000/month billed yearly, and profile and email overages add up as your audience grows
- It is less suited to simple newsletters or businesses without product usage data
For Australian businesses
Data hosting is offered in US or EU data centres. No Australian hosting region is listed.
Customer.io pricing
Pricing as published by Customer.io
Essentials from US$100/month (5,000 profiles, 1 million emails/month). Premium from US$1,000/month billed yearly. Enterprise by quote. Overages: US$0.009 per extra profile on Essentials, US$0.12 per 1,000 extra emails. Startup program offers 12 months free for eligible startups that have raised under US$10M.
Source: customer.io/pricing. Checked 8 October 2026. Prices change often, so confirm on the vendor’s site before you buy.
Alternatives to Customer.io
Other tools listed under Email marketing and automation. Tools from Adam’s stack are marked.
Email marketing and automation with a built-in sales CRM
SMEMid-marketHubSpot
In Adam’s stackAll-in-one CRM with free tier; easiest to start on and grow with
SMEMid-marketEnterpriseThe familiar starting point for small businesses
SMEThe go-to for e-commerce and D2C brands
SMEMid-marketCampaign Monitor
AustralianClean, design-led email marketing
SMEMid-marketEmail, SMS and WhatsApp at a low price
SMEMid-marketEmail for creators and newsletters (formerly ConvertKit)
SMEE-commerce email and SMS
SMEEnterprise B2B marketing automation
Enterprise
FAQ
Customer.io: common questions
What is Customer.io used for?
Customer.io is used to send automated, behaviour-triggered messages such as onboarding emails, activation nudges, re-engagement campaigns and in-app prompts, based on what users do in your product.
How much does Customer.io cost?
Essentials starts at US$100 per month for 5,000 profiles and 1 million emails, Premium starts at US$1,000 per month billed yearly, and Enterprise is custom priced.
Customer.io vs Mailchimp?
Mailchimp is geared to newsletters and list-based campaigns for small businesses. Customer.io is built around product event data and multi-channel journeys, so it suits apps and SaaS businesses with technical resources.
Can’t find a tool that fits?
When every option forces a workaround, our trusted build partners can build it: apps, automations and AI agents designed around how your business actually works.