Two cross-channel platforms: one priced on monthly active users, one on stored profiles.
Choose Braze if you want WhatsApp, LINE and KakaoTalk in every edition next to push, SMS and in-app, with an AI assistant that drafts whole campaigns and Canvases.
Choose Customer.io if your data model is built on accounts and other objects, or you are a startup that raised under $10M and qualifies for a free year.
Choose Brew if you want a fully agentic setup, where your AI agent drives lifecycle marketing to engage and retain customers. Brew designs every email from your brand and runs your automations agentically.
THE BROWSERCOMPANY
Brew is the third column, for teams that want an agent to design and send their email.
| Braze | Customer.io |  Brew | |
|---|---|---|---|
| Key differences | |||
| Billed on | Braze: Monthly active users, plus Action Credits | Customer.io: Profiles: people and objects | Brew: Emails sent and AI credits |
| Fully agentic | Braze: Partly. Partly: Operator drafts campaigns and Canvases; you launch them | Customer.io: Partly. Partly: Assists by default; your team does the work in the app | Brew: Yes. Your agent designs, sends and runs automations end to end |
| Designs finished, on-brand emails | Braze: Partly. Partly: Operator drafts designs; brand guidelines cover voice only | Customer.io: No. Suggests copy and brand colors; you design each email | Brew: Yes. Layout, copy and images from your brand, ready to send |
| Your agent takes it live | Braze: Partly. Partly: MCP creates templates; launching campaigns is in beta | Customer.io: Partly. Partly: Drafts by default; sending needs an admin to allow live access | Brew: Yes. Sends, schedules and runs automations; OAuth and org-scoped MCP require confirmation, brand API keys do not |
| WhatsApp and other messaging apps | Braze: Yes. WhatsApp, LINE and KakaoTalk in every edition | Customer.io: Yes. WhatsApp and LINE on Premium | Brew: No. Email only |
| Braze | Customer.io | Brew | |
|---|---|---|---|
| Creating emails | |||
| Remembers your brand for every email | Braze: Partly. Partly: Voice and tone guidelines, picked in each Operator chat | Customer.io: Partly. Partly: Brand colors and type from your domain | Brew: Yes. Brand files your agent reads every time |
| Visual editor | Braze: Yes. Drag-and-drop and HTML editors | Customer.io: Yes. Design Studio, drag-and-drop and code editors | Brew: Yes. Infinite canvas, edit by hand or in chat |
| Bring the emails you already have | Braze: Yes. Upload an HTML file to the HTML editor | Customer.io: Yes. HTML in the code editor | Brew: Yes. HTML, MJML, React Email, Figma or a forwarded email |
| Automation and data | |||
| Event-triggered automations | Braze: Yes. Canvases start on user actions or API calls | Customer.io: Yes. Events or segment membership | Brew: Yes. Stripe, Shopify, Clerk, Supabase or your own events |
| Builds an automation from a description | Braze: Yes. Operator drafts a Canvas from a prompt | Customer.io: Yes. AI Agent configures the automation | Brew: Yes. Emails, waits and branches together |
| Data pipelines and warehouse sync | Braze: Yes. Cloud Data Ingestion from your warehouse | Customer.io: Yes. Data pipelines built in | Brew: No. API, SDK and integrations |
| Best send time per contact | Braze: Yes. Intelligent Timing | Customer.io: Yes. Send-time optimization | Brew: Yes. Intelligent Send |
| Channels | |||
| Email from your own domain | Braze: Yes. Campaigns, Canvases and API-triggered sends | Customer.io: Yes. Marketing and transactional | Brew: Yes. Marketing and transactional |
| SMS, push and in-app | Braze: Yes. In every edition | Customer.io: Yes. SMS from Standard; push and in-app included | Brew: No. Email only |
| Agents and developers | |||
| MCP server for AI agents | Braze: Yes. Remote server for Claude, ChatGPT and Cursor | Customer.io: Yes. Full API access; read-only by default | Brew: Yes. Every Brew tool, in Claude, ChatGPT, Cursor and Grok |
| API | Braze: Yes. REST API and webhooks | Customer.io: Yes. API, CLI and webhooks | Brew: Yes. REST API, typed SDK and CLI |
| Pricing | |||
| Getting started | Braze: A free trial; no free plan | Customer.io: A year free for startups that raised under $10M | Brew: Free trial with 500 AI credits and 1,000 sends |
| First paid plan | Braze: Braze Go, price on request | Customer.io: Essentials, price on request: 1 million emails a month | Brew: Growth, $99/month: 10,000 AI credits and 50,000 sends |
| Next plan | Braze: Braze Select and Braze Pro, price on request | Customer.io: Standard and Premium, price on request: adds SMS, WhatsApp and LINE | Brew: Pro, $249/month: 25,000 AI credits and 200,000 sends |
| Top plan | Braze: Braze Enterprise, price on request | Customer.io: Custom volume, dedicated infrastructure and HIPAA | Brew: Enterprise: custom volume and a dedicated account manager |
| Security and compliance | |||
| SOC 2 and ISO 27001 | Braze: Yes. Certified | Customer.io: Yes. Certified | Brew: No. Not yet; security review and DPA on request |
| HIPAA | Braze: Yes. HIPAA compliance features | Customer.io: Yes. Compliant | Brew: No. Not supported |
Neither designs a finished, on-brand email from your brand and takes it live from your own agent. Braze’s Operator drafts and your team launches; Customer.io’s MCP writes drafts, and sending needs an admin to allow live access.
Teams that move to Brew tell us AI drafts from tools like these rarely look like their brand, so someone still redesigns them.
Neither lists its prices publicly.
Neither lists prices. Braze prices on monthly active users, with Action Credits for messages and some AI features, across four editions from Braze Go to Braze Enterprise. It has a free trial and no free plan.
Customer.io bills on profiles, people and objects, across Essentials, Standard and Premium, also on request. Essentials covers 1 million emails a month, and startups that raised under $10M get a year free.
Brew bills on emails sent and AI credits, with unlimited contacts: Growth is $99/month for 50,000 sends and 10,000 AI credits.
Brew is fully agentic: your agent designs on-brand emails, sends them and runs your automations. Unlimited contacts on every plan. OAuth and organization-scoped MCP connections ask you to confirm live sends and launches. Brand-scoped API keys can execute permitted calls without the MCP confirmation step.
Connect Claude, ChatGPT, Cursor or Grok over MCP and your agent gets every Brew tool. It designs emails from your brand, builds audiences, runs automations and schedules sends. OAuth and organization-scoped MCP connections ask you to confirm live sends and launches. Brand-scoped API keys can execute permitted calls without the MCP confirmation step.
Paste your website and Brew writes your brand into two files your agent reads for every email. Describe the email and it appears on the canvas, ready to edit by hand or in chat.
We're here to help! Feel free to schedule a call.
Can't find what you're looking for? Contact us at +1-(332)-203-2145 or support@brew.new.
Both cover email, SMS, push and in-app. Braze puts WhatsApp, LINE and KakaoTalk in every edition; Customer.io has WhatsApp and LINE on Premium. Pick Customer.io if your journeys run on accounts and other objects, and Braze if you want the wider set of channels in one edition.
Neither lists prices, so the answer comes from a quote at your own volume. Braze prices on monthly active users plus Action Credits for messages; Customer.io bills on stored profiles, people and objects. Startups that raised under $10M can get a year of Customer.io free, and Braze offers a free trial.
Braze goes further on drafting: Operator drafts full message designs, campaigns and Canvases from a prompt, though you always launch them yourself, and its remote MCP server creates email templates. Customer.io’s AI Agent configures automations and suggests copy and brand colors, and its MCP is read-only by default. Neither designs a finished, on-brand email and sends it from your own agent; Brew does.
Brew, if you want an agent to run your email. Your agent designs finished, on-brand emails from your brand, sends them and runs your automations, with unlimited contacts and public prices. Brew is email only, so SMS, push and in-app stay in another tool.
Yes. Connect Braze in Brew and push any email straight into Braze as an email template, ready for your campaigns and Canvases. For Customer.io, export the finished email as HTML and paste it into its code editor; a direct Customer.io integration is coming soon.
Brew publishes this comparison. Brew Team reviewed the linked first-party documentation. This is a documentation review, not a claim of hands-on testing of every product. Pricing and plan limits can change.
Work at Braze or Customer.io? If anything on this page is wrong or out of date, email support@brew.new and we will correct it. We want to compete on the product, not on a mistaken comparison.
Updated October 2026
