Sales Loves Marketing
- Best for
- SaaS and app companies that want lifecycle messaging triggered by what users do in their product
- Starting price
- $100 per month (Essentials)
- Free plan
- ✗ No
- Free trial
- ✓ Yes
Customer.io is a customer engagement platform. It uses data about what people do in your app or on your website to send automated messages by email, push notification, in-app message, SMS or WhatsApp at the right moment.
It is built for lifecycle marketing: onboarding flows, activation nudges, re-engagement and upsell campaigns that react to real behavior rather than a fixed calendar.
Who is Customer.io for?
Customer.io suits SaaS companies, mobile apps and other digital businesses that track user events and want to act on them. Product, growth and lifecycle marketing teams use it to guide new users, respond to churn signals and send transactional emails from the same system.
It is less suited to a team that only sends a monthly newsletter, or to a sales team looking for a CRM. To get value from it you need to send it event data, which usually means some developer time at the start.
What are Customer.io's main features?
Journeys and the visual workflow builder
You design campaigns in a drag-and-drop builder. A journey can start when someone signs up, triggers an event or enters a segment, then branch based on what they do next. This is the modern version of a drip campaign, driven by behavior.
Channels
Customer.io sends marketing and transactional email, mobile and web push, in-app messages, SMS, WhatsApp and LINE, and can call webhooks to trigger other systems. Push, in-app and webhooks are unlimited on all plans.
Audiences and custom objects
You build segments from your own customer data. Custom objects let you model things such as companies, accounts or subscriptions, so a B2B team can message everyone at an account, not only individuals. See our guide to list segmentation.
Data and integrations
You can send data from your app and website, sync with a data warehouse and pass data on to other tools. Higher plans include premium data integrations.
AI Agent
Customer.io's AI Agent, in beta when checked, can build an automation from a single prompt and answer questions about how a campaign is performing. The platform also connects to AI tools through MCP, a CLI and the API.
How much does Customer.io cost?
Prices checked on 31 October 2026 on Customer.io's pricing page, in US dollars:
| Plan | Price | Main limit |
|---|---|---|
| Essentials | From $100/month, billed monthly | 5,000 profiles, 1 million emails per month |
| Premium | From $1,000/month, billed yearly | Custom profile and email volume |
| Enterprise | Custom | Dedicated support and capacity |
Pricing is based on your account's highest number of profiles, meaning people plus objects. Messages above plan limits cost extra. You can add unlimited team members. There is a 14-day free trial, and startups that have raised under $10 million can apply for a year free.
What do users say about Customer.io?
Customer.io is rated 4.4 out of 5 on G2 from 1,000 reviews at the time of checking. G2's summary says users praise its ease of use, behavior-based automation, flexible features and helpful support.
The most common complaints on G2 are a steep learning curve, limited reporting that needs workarounds, a lack of deeper email analytics, confusing navigation and segmentation for some users, and limits on how campaigns can be organized.
When should you choose an alternative?
- You want marketing automation tied to a CRM. Compare HubSpot.
- You want simpler email marketing for a smaller list. Look at Mailchimp or ActiveCampaign.
- You want messaging combined with live chat and support. Consider Intercom.
Read more about drip marketing or browse all marketing automation tools.
Key features
- Journeys. A visual workflow builder for automated campaigns triggered by events, attributes and segment changes.
- Multichannel messaging. Email, transactional email, mobile and web push, in-app messages, SMS, WhatsApp, LINE and webhooks from one platform.
- Audiences and segmentation. Build segments from people and custom objects, such as accounts or subscriptions, using your own data.
- Data and integrations. Bring in data from your app, website and data warehouse, and send it on to other tools.
- Design Studio. Build and manage message templates and content at scale.
- AI Agent. Turns a prompt into a configured automation and answers questions about campaign results; in beta when checked. Also works with AI tools through MCP, CLI and API.
Customer.io pricing
| Plan | Price | Notes |
|---|---|---|
| Essentials | From $100 per month, billed monthly, for 5,000 profiles | 1 million emails per month, 2 object types, the visual workflow builder, AI Agent with core skills, basic data integrations and email and community support. Price rises with profile count. |
| Premium | From $1,000 per month, billed yearly | Custom profile and email volume, 10 object types, daily AI routines, premium data integrations, 90-day onboarding, premium support and HIPAA compliance. |
| Enterprise | Custom | Best volume pricing, priority support and sending capacity, audit logging, a dedicated customer success manager and implementation specialist. |
Customer.io FAQ
How much does Customer.io cost?
On 31 October 2026 the Essentials plan started at $100 per month, billed monthly, for 5,000 profiles. Premium started at $1,000 per month billed yearly, and Enterprise is custom. Your bill is based on your maximum number of profiles.
Does Customer.io have a free plan or trial?
There is no free plan, but there is a 14-day free trial. Startups that have raised under $10 million can apply for 12 months free through the Startup Program.
What counts as a profile in Customer.io?
A profile is a uniquely identified person or object, such as a company account. Customer.io charges based on the highest number of profiles in your account.
Is Customer.io good for B2B SaaS?
Yes, if your messages depend on product usage. Custom objects let you message by account as well as by person, and campaigns can react to events from your app. It is not a sales CRM.