The Customer.io Insider’s Guide
Everything we know about Customer.io in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Customer.io
The Insider’s Guide
Data-driven email, SMS, push and in-app messaging for product teams
Every plan, grade, refund rule and rival among email marketing and newsletter tools, read from Customer.io’s own pages.
Made by Peaberry Software, Inc. · checked Oct 17, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Customer.io’s own pages, its app-store listings and our grades. Every fact in it is on Customer.io’s page too, where it is kept up to date. Checked Oct 17, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.2
GPA, above 2 of the 24 other email marketing and newsletter tools we grade
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.
To get you started, here are 9 things to know about Customer.io, taken from its own pages and our grades.
- 1
Best for product teams messaging users from app data
And your product has to be sending it data before it does anything.
- 2
Paid plans start at $100 a month
As its pricing page puts it: $100 per month for up to 5,000 profiles, billed monthly.
- 3
You can try it first
14-day free trial with up to 5,000 messages across all channels
- 4
It runs on Web
Web.
- 5
Journeys and workflow builder
Cross-channel campaigns built in a visual workflow builder, with send-time optimization, LLM actions and API-triggered broadcasts.
- 6
Many channels
Email, transactional email, SMS, push, in-app messages, WhatsApp, LINE and webhooks from one account; push and in-app are unlimited.
- 7
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.
- 8
A 2.2 GPA, above 2 of 24
That is against the other email marketing and newsletter tools we grade, on value, the free plan, features, ease of use and platforms.
- 9
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.
Customer.io at a glance
- Pricing
- Free trial, from $100 per month for up to 5,000 profiles, billed monthly
- Free plan
- No
- Free trial
- 14-day free trial with up to 5,000 messages across all channels
- Runs on
- Web
- Made by
- Peaberry Software, Inc., since 2012
- Category
- Email Marketing & Newsletters
- Our grade
- 2.2 GPA, fair
The report card
Best for product teams messaging users from app data
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.
| Subject | Grade | Comment |
|---|---|---|
| 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. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Customer.io is for
- Great if you run a software or app company and want messages triggered by what users do
- Handy when you want receipts, marketing emails, push and in-app messages in one tool
- Good for startups that raised under $10 million, who can get up to a year free
Who it is not for
- Pricey if you just want a newsletter, at $100 a month before you've sent anything
- Skip it if nobody on your team can send data through an API or SDK
- Tight if you need chat support or onboarding help, which start on Premium at $1,000 a month
Good to know
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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$100
A month to start
Customer.io is a paid product with a free trial, starting at $100 per month for up to 5,000 profiles, billed monthly.
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.
Trying it first
14-day free trial with up to 5,000 messages across all channels
Read from customer.io on Oct 17, 2026.
Ways to pay less
Startups
Up to 12 months free for 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.
Stated on customer.io
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Web
Data-driven email, SMS, push and in-app messaging for product teams. Here is what it does, as its own site describes it, and what it covers: public API, AI features, marketing automation, email campaigns, business texting.
It covers the job across more channels than most, built around product data.
- 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.
Where it runs
- Web
What it works with
- Segment
- Snowflake
- Salesforce
- Mixpanel
- Amplitude
- Twilio
- Google Ads
- Facebook Lead Ads
Customer.io is made by Peaberry Software, Inc., and has been around since 2012.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
2/24
Other email marketing and newsletter tools it is graded above
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.
Each grade against the category
Every bar is all 25 email marketing and newsletter tools we grade, cut by the letter each got. Customer.io’s own letter is outlined.
- DValue for moneyAbove 0 of 24
- CFree plan and trialAbove 2 of 24
- BFeaturesAbove 3 of 24
- CEase of useAbove 1 of 24
- BPlatforms and integrationsAbove 0 of 24
Price against what you get
Each dot is one of 23 email marketing and newsletter tools. Further left costs less; higher up scores better on features, ease of use and platforms. Customer.io is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
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.
What you could not
- Newsletters sent to thousands of people that still reach the inbox.
- Email sent in volume that still reaches the inbox.
- Texts from a business number, registered with the carriers.
- It plugs into other products, Segment, Snowflake and Salesforce among them, and has an API.
- AI features, unless you pay a model provider for each request yourself.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. Customer.io’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Encharge, Brevo, Klaviyo, ActiveCampaign and HubSpot
The 5 tools Customer.io is most often weighed against, with where each one differs from it.
- 2.4GPA
Encharge
Free trial
Behavior-based email automation for SaaS and subscription businesses.
- Customer.io also covers business texting.
- Encharge also covers forms.
- 2.6GPA
Brevo
Free plan · from $9/mo
Email, SMS and WhatsApp marketing priced by emails sent, with a CRM.
- Brevo has a free plan. Customer.io does not, though it has a free trial.
- Customer.io also covers business texting.
- Brevo also covers sales pipeline, forms and live chat.
- 2.4GPA
Klaviyo
Free plan · from $20/mo
Email, text and push marketing built on online-store customer data.
- Klaviyo has a free plan. Customer.io does not, though it has a free trial.
- Customer.io also covers business texting.
- Klaviyo also covers forms and reports.
- 2.4GPA
ActiveCampaign
Free trial · from $15/mo
Email marketing and multi-step automation priced by contacts.
- Customer.io also covers business texting.
- ActiveCampaign also covers sales pipeline, forms and reports.
- 3.2GPA
HubSpot
Free plan · from $20/mo
Free CRM at the center of a marketing, sales and service suite.
- HubSpot has a free plan. Customer.io does not, though it has a free trial.
- Only HubSpot lists iOS and Android apps.
- Only HubSpot lists a browser extension.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
14
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Customer.io free?
No, Customer.io is a paid product, but you can try it first. 14-day free trial with up to 5,000 messages across all channels.
How much does Customer.io cost?
Customer.io lists 3 plans. Essentials: $100 per month for up to 5,000 profiles, billed monthly.
What platforms does Customer.io work on?
Customer.io is available on Web.
Does Customer.io offer any discounts?
Customer.io publicly lists the following: Up to 12 months free for startups.
Does Customer.io have an Android app?
No Android app was listed when its pages were read on Oct 17, 2026. Customer.io is listed for Web.
Does Customer.io have an iPhone app?
No iPhone app was listed when its pages were read on Oct 17, 2026. Customer.io is listed for Web.
Is Customer.io open source?
Customer.io is not described as open source on its own site, as read on Oct 17, 2026.
Does Customer.io have an API?
Yes. Customer.io offers a public API, according to its own site.
What does Customer.io integrate with?
Customer.io's listing names Segment, Snowflake, Salesforce, Mixpanel, Amplitude, Twilio, Google Ads and Facebook Lead Ads.
Who makes Customer.io?
Customer.io is made by Peaberry Software, Inc. It dates from 2012.
What are the alternatives to Customer.io?
The closest alternatives to Customer.io in our directory are Encharge, Brevo, Klaviyo, ActiveCampaign and HubSpot.
How does Customer.io compare with other 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.
Is Customer.io good value for money?
ToolGPA grades Customer.io D for value for money. 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.
Could I make my own version of Customer.io?
To replace Customer.io you would be making newsletters sent to thousands of people that still reach the inbox.
Where this guide comes from
The prices, plans, platforms and features were read from Customer.io’s own pages on Oct 17, 2026, and the grades were given on Oct 17, 2026. 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.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Peaberry Software, Inc. Prices change, so check customer.io before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
1,858
Tools graded, in 46 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
ToolGPA is free to read. It may earn a commission from affiliate links and it works with sponsors, but anything paid for is labelled and no one can pay for a grade. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
1,858
tools graded
46
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Customer.io, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/customer-io
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Customer.io: The Insider's Guide", checked Oct 17, 2026. https://toolgpa.com/tools/customer-io
Know someone choosing between email marketing and newsletter tools?
Send them this guide: toolgpa.com/tools/customer-io/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded email marketing and newsletter tools after Customer.io, each with an Insider's Guide of its own.
- Email Marketing & Newsletters Insider's GuideEvery one of the 25 email marketing and newsletter tools we grade, compared
- Zoho Campaigns Insider's GuideEmail, SMS and WhatsApp campaigns that tie into Zoho's apps3.0 GPA
- EmailOctopus Insider's GuideSimple, low-cost email marketing with a free plan for 2,5002.8 GPA
- Mailchimp Insider's GuideEmail and SMS marketing with automations, priced by contact count2.8 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Customer.io’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. ToolGPA uses affiliate links and may earn a commission from them, and it works with sponsors; anything paid for is labelled, and no one can pay for a grade. Customer.io is a trademark of its owner, and this guide is not made, paid for or approved by Peaberry Software, Inc. Prices and plans change: check customer.io before you buy.