Customer.io
6.5/10Customer.io is a behavior-driven messaging platform that lets product-led and tech companies automate email, push, in-app, SMS and WhatsApp messages based on user data.
Data last updated November 2026 · Our methodology
Overview
Customer.io is a lifecycle messaging and automation platform built around event and attribute data from your product. Teams send in user events, then use a visual workflow builder with branching, delays, goals and loops to trigger email, push, in-app, SMS and WhatsApp messages from one place. It includes a built-in customer data platform with custom objects, behavioral segmentation, an email builder called Design Studio, and API and webhook access on every plan. Newer plans also include AI agent features. It suits SaaS, apps and other tech businesses that have developers to set up event tracking. Pricing is based on profiles. Essentials starts at $100 per month for 5,000 profiles and 1 million emails, and the price rises in steps to $505 at 50,000 profiles. Extra profiles cost $0.009 each and extra emails cost $0.12 per thousand. Premium starts at $1,000 per month, billed yearly, and adds a native Salesforce integration, data warehouse destinations, custom roles, managed deliverability and onboarding. Enterprise is priced by quote. Companies that have raised less than $10M can get up to 12 months free through the startup program. The platform holds SOC 2 Type II and ISO 27001 certifications and offers US and EU data centers. The main drawbacks are the learning curve and the need for developers. Reviewers also say costs climb quickly because every stored profile counts toward the bill, inactive ones included. There are no native landing pages or forms.
Our Rating
Who Customer.io is best for
Good fit
The vendor positions it for SaaS and product-led companies, with event-driven lifecycle messaging.
- Mid-Market8/10
About 38% of G2 reviewers are mid-market, and Premium adds a Salesforce integration, warehouse sync and custom roles.
The startup program gives early-stage companies up to a year free, and its developer-friendly data model suits product-led teams.
Its workflows and segmentation are deep, but reviewers say marketers often need developer help to set it up.
Less suited
Every plan has API and webhook access, and developers are needed to set up event tracking.
Enterprise offers custom volumes, audit logging and dedicated support, but only about 3.5% of G2 reviewers are enterprises.
- Product Teams6/10
In-app messages and workflows triggered by product events support onboarding and adoption work.
- Healthcare5/10
It supports HIPAA, which allows use with health data.
The $100 entry price, per-profile billing and learning curve can be heavy for small non-technical teams.
It can send email, SMS and push messages, but the notes describe no ecommerce-specific features.
Profile-based pricing from $100 a month and the need for a developer are a poor fit for solo professionals.
Pros & Cons
Pros
- Its visual workflow builder supports branching, goals and loops, and it can coordinate email, push, in-app, SMS and WhatsApp in one flow.
- Segmentation can use custom events, attributes and inactivity windows, and a built-in CDP stores custom objects.
- Every plan includes API and webhook access, and reviewers say developers can connect it easily.
- It holds SOC 2 Type II and ISO 27001 certifications, supports HIPAA, offers SSO, and lets you choose US or EU data residency.
- Startups that have raised under $10M can get up to 12 months free.
Cons
- Every stored profile counts toward the bill, inactive ones included, so costs climb quickly as the contact list grows.
- Setup has a steep learning curve and usually needs a developer to implement event tracking.
- There are no native landing pages or signup forms.
- Reviewers say reporting is limited and often needs data exports.
- Chat support starts at Premium, and Essentials gets only email and community support.
Key Features
Not included
- Landing Pages
Customer.io Pricing
Essentials
- 2 workspaces
- 2 object types
- 25 inbox previews
- Basic integrations
- 1M emails per month
- Visual workflow builder
- Email and community support
- Core AI agent skills, 3 custom execution skills, 1 weekly agent routine
- 5,000 profiles included (10k $145, 20k $235, 30k $325, 40k $415, 50k+ from $505)
Enterprise
- Custom pricing
- Best volume pricing
- Custom agent limits
- Priority technical support
- Audit logging (by consultation)
- Priority sending capacity and dedicated support at extra cost
Premium
- Custom roles
- 90-day onboarding
- Chat and email support
- Managed deliverability
- HIPAA available at extra cost
- Custom profile and email volume
- From $1,000 per month, billed yearly
- 10 object types, unlimited workspaces
- Data warehouse destinations and data replay
- Premium integrations including native Salesforce
Frequently Asked Questions
Essentials starts at $100 per month for 5,000 profiles and 1M emails, rising to $505 at 50,000 profiles. Premium starts at $1,000 per month billed yearly, and Enterprise is priced by quote.
You can start a trial from the pricing page, though the vendor doesn't state its length. Companies that have raised under $10M can get up to a year free through the Startup Program.
Billing is based on your maximum number of uniquely identified profiles. Extra profiles on Essentials cost $0.009 each, and extra emails cost $0.12 per 1,000.
Its security page lists SOC 2 Type II and ISO 27001 certification, HIPAA and GDPR compliance, SSO, two-factor authentication, and US or EU data centers.
The native Salesforce integration and data warehouse destinations are included on Premium and above.
It supports email, push, in-app, SMS and WhatsApp, and web push comes at no extra cost.
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