Customer.io vs. Braze: Comparing platforms for enterprise scale 

The best platform for your team is the one that helps you do your best work and hit your biggest goals. For most marketers, that means a platform you can set up quickly, build in every day without waiting on engineering, and keep growing on as your audiences, channels, and data expand.

That's what Customer.io is built for. It brings your data, your messaging, and your AI together in one flexible platform. Marketers build and scale journeys across email, SMS, push, in-app messages, WhatsApp, LINE, Slack, and webhooks in the same workflow, developers and coding agents work through the API, MCP server, and CLI, and native Salesforce and HubSpot sync keep the CRM of your choice in the loop. Pricing built on profiles and email volume keeps your costs easy to plan.

Room to grow is the part you can check against production numbers. 11,000+ brands trust Customer.io to send data-powered messages each day, and in 2025 Customer.io sent more than 100 billion messages. Below, you'll see how Customer.io and Braze compare head to head, and five questions you can put to any platform on your shortlist: event volume, send throughput, data model flexibility, cost structure, and time to launch.

• Customer.io doesn't cap data points, offers unlimited monthly API calls on every plan, and keeps event properties usable in segments and journeys beyond a 30-day window.
• One Customer.io workspace processed more than 7.5 billion events and profile updates in 30 days (about 250 million a day), and the platform ingests more than 130,000 events and profile updates per second at peak.
• Observed per-channel peaks (busiest 30-second average of successful sends), each from a single customer, reached more than 5,000 emails per second and more than 14,000 push notifications per second, and some of our largest customers each send more than 60 million emails a month.
• During Black Friday and Cyber Monday 2025, about 92% of messages sent through Customer.io completed in under one second, and about 97% within three seconds.
• G2's Fall 2026 reports ranked Customer.io #1 in the Momentum Grid for both Marketing Automation and Personalization, ahead of Braze in both, with a Leader badge in Marketing Automation, High Performer in Enterprise, and #7 in the Global Marketing Automation Grid.

Salesforce has announced that it will acquire Braze, with the deal expected to close in Salesforce’s fiscal year 2028.

If you run Braze today, or you have Braze on your shortlist, it’s natural to wonder what that means for your team: your next renewal, your roadmap, and the programs you’ve spent years building. A good first step is to get clear on your options, so whatever you decide comes from what you need and what you can verify today.

That’s where Customer.io comes in. Here’s what you can count on today:

• Your CRM stays your choice. Customer.io’s native, bidirectional Salesforce integration was built with direct support from Salesforce, HubSpot syncs in both directions as well, and Pipedrive, Close, and Attio each have a native integration for sending Customer.io data out. Any other CRM connects through reverse ETL, the API, and webhooks, so you pick your system of record and your messaging runs on an independent platform around it.
• Your data keeps the shape you gave it. Custom objects, nested event data, and no data point caps.
• Your costs are easy to plan. Published plans built on profiles and email volume.
• Your team can start building now. Your AI Agent and LLM actions are included on every plan, and the MCP server and CLI give your team and your coding agents a way in.

Book a demo to walk through your setup, or start a free trial to try it on your own data. Either way, you can see how it fits before you decide anything.

Teams that choose Customer.io over Braze cite the same reasons most often:

• A flexible data model
• Two-way data connections
• Costs they can forecast
• An open approach to AI
• Hands-on support from day one.

Here's how we compare:

Customer.io doesn't cap data points, so every event, attribute, and object you send stays available for segments, triggers, and personalization, and event properties remain usable beyond a 30-day window. A team can build a re-engagement segment on last quarter's behavior without planning for it when the event first fired, and a B2B SaaS team can model accounts, subscriptions, and workspaces as custom objects connected to the people inside them. Pricing is built on profiles and email volume, two numbers you already track, with push notifications, in-app messages, webhooks, and API calls unlimited, so you can model your bill at your current volume and at double.

Braze’s Account Objects are in Early Access, its Segment Extensions can target custom and nested event properties with lookback limits to check against your use case, and its pricing is quote-based on editions, monthly active users, and credits, so ask for a quote at your current volume and at double to compare.

Your AI Agent builds from a single prompt. Describe the automation or segment you want, and the Agent creates it, drafts the messages, and analyzes how it performs, while respecting user permissions and asking for approval on sensitive actions. LLM actions bring AI into the steps of an automation, saving structured output as journey attributes you can use for personalization and conditions, and Routines run recurring tasks such as deliverability checks and segment audits on a schedule.

For teams that work in other AI tools, the Customer.io MCP server connects Claude, ChatGPT, and Cursor to your workspace, and admins decide whether MCP connections can modify live resources or see sensitive profile data, with both settings off by default. The Customer.io CLI is built for AI agents and coding assistants as well.

Braze also has an AI offering, and its Decisioning Studio is built for autonomous optimization.

Premium and Enterprise plans add chat support, a two-hour first outreach response time, and onboarding support, and Enterprise options include audit logging and data governance, a dedicated customer success manager, and a shared Slack channel, so your team has a direct line while you migrate and scale.

Braze sells customer success in tiers (Core, Select, Premier, Absolute), with a named customer success manager from Select and onboarding and migration listed as one-time services, so ask what is in your base contract. For production numbers on volume, throughput, and delivery speed, see the five criteria below.

For each of the five areas below, you'll find the question to ask any vendor and how Customer.io performs.

How many events does one production workspace process per day, and is event data capped or limited by a lookback window?

One workspace processed more than 7.5 billion events and profile updates in 30 days, about 250 million a day, and the platform ingests more than 130,000 events and profile updates per second at peak. Monthly API calls are unlimited on every plan, with no data point caps, and event properties stay usable in segments and journeys beyond a 30-day window.

What are your observed peak sends per second by channel, and what do your largest customers send in a month?

Observed per-channel peaks, each for a single customer: more than 5,000 emails, 14,000 push notifications, 4,000 webhooks, 2,800 in-app messages, and 1,400 SMS messages per second. Ten customers each send more than 60 million emails a month, and one customer sent more than 670 million messages in 30 days across email, push, and webhooks. Peak rates are the busiest 30-second average of successful sends for a single customer in each channel, Sep 9 to Oct 9, 2026. Volumes cover the same period.

Can you model accounts, subscriptions, and other non-person data, identify people by more than one ID, and sync with your warehouse and CRM?

Custom objects (two object types on Essentials, ten on Premium, custom on Enterprise), nested event data, workspaces that identify people by ID, email, or both, reverse ETL on every plan, and Salesforce data in and data out.

What drives your bill as volume grows, and what does the base price include?

Pricing is built on profiles and email volume. Plans start at $100 a month for Essentials and $1,000 a month for Premium, with custom Enterprise pricing. Push notifications, in-app messages, webhooks, and API calls are unlimited.

Your AI Agent, which can build an automation from a single prompt, and LLM actions, which bring AI into the steps of an automation, are included on every plan from your free trial through Enterprise, with additional AI credits available as usage grows.

How long does it take to go from contract to a first live journey, and what onboarding and migration help comes with the plan?

Premium and Enterprise plans offer migration support, a dedicated technical implementation specialist, and onboarding support (90 days on Premium). A self-serve free trial lets your team build a proof of concept before you sign.

Peak season gives the clearest picture of delivery speed. During Black Friday and Cyber Monday 2025, about 92% of messages sent through Customer.io completed in under one second, and about 97% completed within three seconds. Across the year, the platform runs at 99.98% infrastructure uptime and sent more than 100 billion messages in 2025.

Teams at Notion, Lovable, and Figma trust Customer.io to manage their customer engagement programs for millions of users around the world. Notion's lifecycle team, for example, runs localized onboarding for a user base where 80% of users live outside the United States, and its localized campaigns lifted conversion by 6-7% with open rates of 49-51%.

Georgia Aquarium rebuilt its marketing stack around BigQuery and Customer.io, with data flowing from its ticketing platform into the warehouse, into Customer.io, and back out again, and increased monthly send volume by more than 2,000%.

See how Customer.io works for your business. Book a demo and bring your peak volume, your biggest goals, and your current Braze quote, and we'll show you how Customer.io handles each one. Prefer to test it yourself? Start a free trial and build your first journey today.

Salesforce has announced that it will acquire Braze, with the deal expected to close in Salesforce's fiscal year 2028. If you're a Braze customer weighing your options, Customer.io offers a native two-way Salesforce integration, published pricing, and AI included on every plan, and you can book a demo or start a free trial to test it on your own data.

No. Customer.io supports enterprise programs at scale: its accounts manage more than 160 million profiles, ten customers each send more than 60 million emails a month, and teams at Notion, Lovable, and Figma run their engagement programs on it. Enterprise plans add audit logging, a dedicated customer success manager, and a shared Slack channel. G2 named Customer.io a High Performer in Enterprise.

Customer.io handles event volumes at the scale of billions per month in production: one workspace processed more than 7.5 billion events and profile updates in 30 days, about 250 million a day, and the platform ingests more than 130,000 events and profile updates per second at peak. Monthly API calls are unlimited on every plan.

Customer.io pricing is built on profiles and email volume, with unlimited push notifications, in-app messages, webhooks, and API calls, and with your AI Agent and LLM actions included on every plan. Pricing for any platform at scale depends on your profile count, channel mix, data volume, AI usage, support tier, and onboarding needs, so the most accurate comparison is a quote from each vendor on the same volumes. Book a demo to get a Customer.io quote on yours.

Timelines depend on how many journeys, data sources, and channels you migrate. Premium and Enterprise plans offer onboarding support, migration support, and a dedicated technical implementation specialist, and onboarding support is included with all Premium plans.

Yes. Customer.io launched native LINE messaging in March 2026. You can add LINE text and image messages to the same journeys and one-time campaigns you build for email, SMS, push notifications, in-app messages, WhatsApp, Slack, and webhooks. Setup takes a LINE Official Account and a Messaging API channel access token, and the LINE guide walks through use cases.

Yes. Customer.io supports GDPR, CCPA, HIPAA, SOC 2 Type II, and ISO 27001 requirements, with SSO, two-factor authentication, role-based permissions, and US and EU data centers. HIPAA compliance and audit logging are available on Premium and Enterprise plans by arrangement.

Yes. Customer.io has a native two-way Salesforce integration, built with direct support from Salesforce. It maps contacts, leads, accounts, and opportunities to profiles, events, and custom objects, and it sends data back out to Salesforce, so your team can keep Salesforce as the system of record and run messaging on an independent platform. If you use a different CRM, the integration directory lists native HubSpot sync in both directions and native data-out integrations for Pipedrive, Close, and Attio, and any other CRM connects through reverse ETL, the API, and webhooks, so the choice of CRM stays yours.