# Customer.io

> Data-driven email, SMS, push and in-app messaging for product teams

Customer.io is a messaging platform that sends email, SMS, push, in-app and WhatsApp messages triggered by what people do in your product. Teams send customer data in through its API, SDKs or data warehouse syncs, build journeys in a visual workflow builder, and send transactional and marketing messages from one place. It is priced by profiles stored, not seats.

- **Category:** Email Marketing & Newsletters
- **Made by:** Peaberry Software, Inc. (since 2012)
- **Website:** https://customer.io
- **Runs on:** Web
- **Facts last checked:** Oct 17, 2026

## Pricing

Customer.io is a paid product with a free trial, starting at $100 per month for up to 5,000 profiles, billed monthly.

- **Pricing model:** Free trial
- **Free plan:** None.
- **Free trial:** 14-day free trial with up to 5,000 messages across all channels.

| Plan | Price | What you get |
| --- | --- | --- |
| Essentials | $100 per month for up to 5,000 profiles, billed monthly | 1 million emails a month, unlimited users, 2 object types, visual workflows and the AI Agent. Extra profiles cost $0.009 each and extra emails $0.12 per 1,000. |
| Premium | $1,000 per month and up, billed yearly | Custom profile and email volume, 10 object types, chat support, 90-day onboarding, managed deliverability and HIPAA compliance at extra cost. |
| Enterprise | Custom | Dedicated hardware, audit logging, a customer success manager, priority technical support and a shared Slack channel. |

Read from https://customer.io/pricing on Oct 17, 2026. Prices change, so confirm with Customer.io before buying.

## Ways to pay less

- **Up to 12 months free for startups** (Startups): Startups new to Customer.io that have raised less than $10 million can get up to 12 months of Essentials features free, with up to 30,000 profiles. Source: https://customer.io/solutions/startups

## Key features

- **Journeys and workflow builder:** Cross-channel campaigns built in a visual workflow builder, with send-time optimization, LLM actions and API-triggered broadcasts.
- **Many channels:** Email, transactional email, SMS, push, in-app messages, WhatsApp, LINE and webhooks from one account; push and in-app are unlimited.
- **Profiles and custom objects:** Store people and objects such as accounts or courses with unlimited attributes, then segment on them, including an AI segment builder.
- **Data in and out:** Unlimited API calls, mobile SDKs, reverse ETL from a data warehouse and an MCP server; warehouse destinations need Premium.
- **Design Studio:** Drag-and-drop and code editors with reusable components, version history, AI translation and 25 inbox previews.
- **AI Agent:** A beta agent that carries out tasks in the account, with scheduled routines: one weekly task on Essentials and five daily on Premium.

## Good for

- Software and app companies sending messages from product data
- Teams wanting transactional and marketing messages in one tool
- Startups under $10 million raised, through its free-year program

## Worth knowing

- Usage beyond the plan costs extra: $0.12 per 1,000 emails on every plan, and AI credits at $10 per 100,000 on Essentials and Premium.
- Every account is reviewed by hand before it can send messages.
- SMS volume is priced on request on every plan.
- Chat support, onboarding help and custom roles start with Premium, which is billed yearly from $1,000 a month.

## ToolGPA grades

**GPA: 2.2 out of 4**, graded Oct 17, 2026. Customer.io is for software and app companies that want messages driven by what people do in the product: email, texts, push, in-app and WhatsApp from one visual workflow builder. It's a big step up in price, from $100 a month for 5,000 profiles. And your product has to be sending it data before it does anything.

- **Value for money: D.** $100 a month for 5,000 profiles, many times what email tools start at and well into the dearest tenth. It does include 1 million emails, unlimited users and unlimited push and in-app messages. Premium jumps to $1,000 a month billed yearly.
- **Free plan and trial: C.** No free plan, but there's a 14-day trial with up to 5,000 messages across every channel. Startups that raised under $10 million can get up to a year of Essentials free, which is a real deal if that's you.
- **Features: B.** Visual journeys across email, SMS, push, in-app, WhatsApp, LINE and webhooks, custom objects, an AI segment builder, warehouse syncs, transactional email and a design studio with version history. It covers the job across more channels than most, built around product data.
- **Ease of use: C.** No App Store rating on record. Before the first message your product has to send people and events through the API, SDKs or a warehouse sync, and every account is checked by hand before it can send.
- **Platforms and integrations: B.** Web, with Segment, Snowflake, Salesforce, Mixpanel, Amplitude, Twilio, Google Ads and Facebook Lead Ads, an API, mobile SDKs and an MCP server. There's no desktop app, so B is the top.

These are ToolGPA's own grades. Graded from this listing, whose facts were read from Customer.io's own pages on 17 October 2026. Not based on using the product, and shorter than our full reviews.

## Where it stands among email marketing and newsletter tools

- Customer.io's GPA of 2.2 is higher than 2 of the 24 other email marketing and newsletter tools we grade, and level with 2.
- It stands best on features (B, above 3 of 24) and worst on value for money (D, above 0).
- Its paid plans start at $100 a month, against a middle price of $13 for the category: 22 of the 22 others that charge start lower.
- On features, ease of use and platforms it scores 2.7 out of 4. 3 tools score higher and cost less.

The category's chart of price against score: https://toolgpa.com/charts/email-marketing

## Keep it, or make your own?

**Keep it.** To replace Customer.io you would be making newsletters sent to thousands of people that still reach the inbox. That is not a weekend's work, with an AI app builder or without one. That makes this kind of software worth paying for, not this one in particular: 20 of the 24 other email marketing and newsletter tools grade higher. It costs $1,200 a year.

- You could not: Newsletters sent to thousands of people that still reach the inbox.
- You could not: Email sent in volume that still reaches the inbox.
- You could not: Texts from a business number, registered with the carriers.
- You could not: It plugs into other products, Segment, Snowflake and Salesforce among them, and has an API.
- You could not: AI features, unless you pay a model provider for each request yourself.
- You could not: The depth: we grade its features B, which means it covers the whole job.

A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it.

## Works with

Segment, Snowflake, Salesforce, Mixpanel, Amplitude, Twilio, Google Ads, Facebook Lead Ads

**Tags:** Email campaigns, Marketing automation, Business texting, AI features, Public API

## Alternatives

- [Encharge](https://toolgpa.com/tools/encharge): Behavior-based email automation for SaaS and subscription businesses. [Compare](https://toolgpa.com/compare/customer-io-vs-encharge)
- [Brevo](https://toolgpa.com/tools/brevo): Email, SMS and WhatsApp marketing priced by emails sent, with a CRM. [Compare](https://toolgpa.com/compare/brevo-vs-customer-io)
- [Klaviyo](https://toolgpa.com/tools/klaviyo): Email, text and push marketing built on online-store customer data. [Compare](https://toolgpa.com/compare/customer-io-vs-klaviyo)
- [ActiveCampaign](https://toolgpa.com/tools/activecampaign): Email marketing and multi-step automation priced by contacts. [Compare](https://toolgpa.com/compare/activecampaign-vs-customer-io)
- [HubSpot](https://toolgpa.com/tools/hubspot): Free CRM at the center of a marketing, sales and service suite. [Compare](https://toolgpa.com/compare/customer-io-vs-hubspot)

## Sources

The prices, plans, platforms and features above were read from these pages on Oct 17, 2026:

- https://customer.io/pricing
- https://docs.customer.io/accounts/billing/plan-features/
- https://customer.io/solutions/startups
- https://customer.io/about
- https://customer.io/integrations

Page: https://toolgpa.com/tools/customer-io
Listed by ToolGPA (toolgpa.com).