Brevo is a live chat system designed for customer support and engagement on websites.
Websites Using Brevo
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What Is Brevo?
Brevo, formerly known as Sendinblue, is an all-in-one digital marketing and customer-relationship platform that combines email marketing, SMS and WhatsApp campaigns, marketing automation, a CRM, transactional messaging, and a live-chat widget in a single product. The company rebranded from Sendinblue to Brevo in 2023, but the underlying platform, and many of its technical fingerprints, carried over, so sites built before the rename often still show Sendinblue-era signals.
Brevo's positioning is that of an affordable, broad alternative to using several separate tools for email, SMS, automation, and chat. Rather than pairing a dedicated email service provider with a separate CRM and a standalone chat widget, smaller and mid-size businesses can run much of their customer messaging from one account. The platform serves a large base of businesses worldwide and is widely recognized as one of the more popular European-headquartered marketing platforms.
In StackOptic's technology database, Brevo is classified under customer_support, because the externally detectable footprint most often surfaces through its live-chat and conversation widget, which a visitor can see and interact with on a site. The same vendor also powers email and SMS marketing behind the scenes, but those channels are largely invisible on the public web page, whereas the chat widget loads a script and renders a visible interface that detection tools can identify.
Brevo is not a browser extension and not something visitors install. The chat and tracking components are third-party scripts that the site owner embeds in their own pages, while the email and automation features operate from Brevo's servers. Because the on-page components load from Brevo's infrastructure, they leave observable fingerprints that a server-side analyzer like StackOptic can detect directly from a URL.
It helps to understand the breadth of what Brevo covers, because it explains why the same brand can appear under different categories depending on which feature a site uses. A business might adopt Brevo purely to send email newsletters, in which case the most visible trace is the link-tracking and unsubscribe domains in the emails themselves. Another business might enable the on-site chat widget to talk to visitors in real time, which is the signal most readily seen on the website. A third might use Brevo's forms and tracking script to capture leads. The platform's all-in-one nature means its fingerprints span email infrastructure, on-page chat, and tracking, and which one you observe depends on how the business uses it.
How Brevo Works
Brevo brings several messaging channels together under one account. Email marketing is the historical core: users build campaigns in a drag-and-drop editor, manage contact lists and segments, and send broadcasts, while Brevo handles delivery, bounce processing, and engagement tracking. Transactional email is sent programmatically through Brevo's API or SMTP relay for things like order confirmations and password resets, separate from marketing broadcasts.
SMS and WhatsApp campaigns extend messaging beyond email, letting businesses reach contacts on mobile channels from the same contact database. Marketing automation ties these channels together with visual workflows: a contact who joins a list, abandons a cart, or hits a behavioral trigger can be enrolled in an automated sequence that sends a series of emails or messages over time. A built-in CRM stores contact and deal information so sales and marketing share a single view of each customer.
The live-chat and conversations module is the piece most visible on a public website. The site owner embeds a small JavaScript snippet that loads Brevo's chat widget, typically rendering a chat bubble in a corner of the page. Visitors can start a conversation, and the business handles those conversations from Brevo's inbox, alongside other channels. This widget is what most often places Brevo in the customer-support category from a detection standpoint.
Brevo also provides tracking and forms: a tracking script can record on-site activity to feed automation and segmentation, and embeddable signup forms capture new contacts directly into lists. When any of these on-page components load, the browser requests them from Brevo's domains and they call back to Brevo's servers, which is why the platform is observable from outside the page even though its email and automation engines run server-side.
The rebrand from Sendinblue to Brevo is worth understanding from a detection angle. Because the change was primarily one of branding, much of the technical plumbing retained Sendinblue-era naming for a time, and email infrastructure in particular tends to carry legacy domain names long after a rebrand. As a result, a site or its emails may reveal Brevo through either the current branding or older Sendinblue-named scripts, tracking endpoints, and email domains. Treating the two names as the same underlying vendor is essential when interpreting the signals.
How to Tell if a Website Uses Brevo
Brevo leaves several externally visible fingerprints, and because of the rebrand, both "brevo" and "sendinblue" naming can appear. StackOptic inspects these from the server side, and you can confirm them manually with browser tools, View Source, or by examining an email's headers.
The chat widget script and domains. The most visible signal is the conversations/chat widget, which loads from Brevo's infrastructure (look for script requests to brevo.com hosts, and historically sendinblue.com equivalents such as a conversations or chat widget script). A <script> referencing these hosts strongly indicates Brevo.
The tracking script. Brevo's on-site tracking script (historically named with Sendinblue branding, for example a sib or sendinblue tracker, now Brevo-branded) loads to record visitor activity. Its presence in the source or Network tab is a strong signal.
JavaScript globals. The widgets and tracker often expose recognizable globals or initialization objects (names containing Brevo, sib, or sendinblue). Checking the DevTools Console for these can confirm the platform.
Email-side signals. When a site sends marketing or transactional email through Brevo, the messages typically route through Brevo/Sendinblue sending infrastructure, with link-tracking and unsubscribe domains on Brevo-controlled hosts. Inspecting an email's headers and link domains is a reliable way to identify the platform even when the website shows no widget.
| Method | What to do | What Brevo reveals |
|---|---|---|
| View Source | "View Page Source" on the homepage | A <script> referencing brevo.com or sendinblue.com, the chat/tracking snippet |
| DevTools Network | Reload and filter requests | Calls to Brevo/Sendinblue hosts loading the chat widget and tracker |
| DevTools Console | Inspect globals and the chat bubble element | Brevo/sib/sendinblue-named objects and widget DOM |
| Email headers | View original/headers of a received email | Brevo/Sendinblue sending domains and link-tracking/unsubscribe hosts |
| Wappalyzer / BuiltWith | Run on the live page or look up the domain | Identifies "Brevo (Sendinblue)" under marketing/live chat |
A quick command-line check is curl -s https://example.com | grep -iE "brevo|sendinblue". If that returns a script or widget reference, the site is very likely running Brevo. For deeper methodology, see our guides on how to detect chat and live-chat tools on a website and how to find what email-marketing platform a website uses.
A few practical notes apply. Because of the rebrand, the most reliable approach is to search for both "brevo" and "sendinblue" strings, since older implementations may still reference the legacy name. The chat widget is sometimes loaded through a tag manager rather than hardcoded, so it may appear only after the tag manager runs, our guide on how to find out what technology a website uses covers reading the full stack including indirectly loaded scripts. Email-only usage will not show up on the website at all; in that case the email headers and link domains are the place to look. Combining on-page signals with email-side signals gives the most complete picture, and server-side analysis is useful because it retrieves the raw HTML and any directly embedded snippet without browser interference.
Key Features
- Email marketing. Drag-and-drop campaign builder, list segmentation, and engagement tracking for broadcasts and newsletters.
- Transactional messaging. API and SMTP relay for order confirmations, receipts, and other system-triggered emails.
- SMS and WhatsApp. Mobile messaging campaigns managed from the same contact database as email.
- Marketing automation. Visual workflows that trigger multi-step sequences based on behavior and list activity.
- Built-in CRM. Contact and deal management so marketing and sales share one customer view.
- Live chat and conversations. An embeddable on-site chat widget feeding a shared inbox for real-time visitor support.
- Forms and tracking. Embeddable signup forms and an on-site tracking script to capture and segment contacts.
Pros and Cons
Pros
- Consolidates email, SMS, automation, CRM, and chat into a single, cost-effective platform.
- Generally affordable for small and mid-size businesses, with a send-volume-based pricing model.
- Reduces tool sprawl by covering multiple messaging channels from one contact database.
- Includes both marketing and transactional email, plus on-site chat, under one account.
Cons
- Breadth can mean individual modules are less deep than best-in-class single-purpose tools.
- The Sendinblue-to-Brevo rebrand can cause confusion when older documentation or implementations reference the old name.
- Advanced automation and reporting may feel limited compared with enterprise marketing suites.
- As with any embedded widget and tracker, it adds third-party scripts and privacy considerations to the page.
Brevo vs Alternatives
Brevo competes across several categories at once, email marketing, marketing automation, and live chat, so its alternatives depend on which feature matters most. The table compares it broadly.
| Platform | Primary strength | Channels covered | Best for |
|---|---|---|---|
| Brevo (Sendinblue) | All-in-one affordability | Email, SMS, WhatsApp, automation, CRM, chat | SMBs wanting many channels in one tool |
| Mailchimp | Email marketing and brand | Email, basic automation, some SMS | Small businesses focused on email and ease of use |
| HubSpot | Integrated marketing and CRM | Email, automation, CRM, chat, more | Companies wanting a deep, unified growth suite |
| Klaviyo | Ecommerce email and SMS | Email, SMS, automation | Online stores prioritizing ecommerce data |
| Intercom | Conversational support and messaging | Chat, in-app messaging, help desk | Product-led teams centered on live chat |
If you find a site uses a different chat or messaging tool, the same detection techniques apply; compare Brevo's conversation widget with a chat-first platform like Intercom to see how an all-in-one marketing suite differs from a dedicated messaging product.
Use Cases
Brevo is most at home with small and mid-size businesses that want to run multiple messaging channels without paying for and integrating several separate tools. An ecommerce store might use Brevo for promotional newsletters, automated abandoned-cart sequences, transactional order emails, and an on-site chat widget, all from one account and one contact list.
It also fits service businesses that combine email marketing with SMS reminders, content sites running newsletters and lead-capture forms, and any company that wants to layer live chat onto its site while keeping conversations connected to its marketing contacts. The all-in-one model is especially attractive to teams without the resources to manage a complex, multi-vendor martech stack.
From a competitive-intelligence and sales perspective, detecting Brevo tells you several things at once. It indicates a business that has consolidated its messaging into one affordable platform, which suggests a particular size and budget profile, and the presence of the chat widget specifically signals an interest in real-time visitor engagement. For a company selling marketing tools, support software, or services, that is a useful qualifying signal, the kind of technographic data explained in our guide on using tech-stack data to qualify leads.
Consider a few concrete scenarios. A growing online retailer might standardize on Brevo to handle everything from welcome series to shipping notifications to live presale questions, avoiding the cost of separate email, transactional, and chat vendors. A local services company might use Brevo to send appointment-reminder SMS messages and follow-up emails while answering quick questions through the chat bubble. A marketing analyst profiling a set of SMB websites might scan for Brevo to identify which prospects already run an all-in-one platform versus a patchwork of point tools. Because the chat and tracking scripts, and the email sending domains, are externally visible, all of these relationships are detectable from the outside, with the rebrand meaning analysts should always check for both the Brevo and Sendinblue names.
Frequently Asked Questions
Why is Brevo listed under customer support rather than email marketing?
Brevo is genuinely an all-in-one platform that does email, SMS, automation, CRM, and live chat. StackOptic categorizes it under customer_support because the component most reliably detected on a public website is its live-chat and conversations widget, which renders a visible interface and loads an identifiable script. Its email and automation features run server-side and are mostly invisible on the page itself, so the on-site signal that surfaces is the chat tooling.
Is Brevo the same as Sendinblue?
Yes. Brevo is the current name for the platform that was previously called Sendinblue; the company rebranded in 2023. The underlying product and much of its technical infrastructure carried over, so older sites and emails may still reference Sendinblue-era script names, tracking endpoints, and sending domains. When detecting the platform, it is best to look for both "brevo" and "sendinblue" strings, since either may be present.
How can I tell if a website uses Brevo for free?
Yes, you can confirm it at no cost. View the page source and search for brevo or sendinblue references, look for the chat widget script and the tracking snippet, or open the DevTools Network tab to watch for requests to Brevo/Sendinblue hosts. If the site only uses Brevo for email, inspect a received message's headers and link domains instead. Free tools like Wappalyzer and BuiltWith will flag Brevo, and curl -s URL | grep -iE "brevo|sendinblue" works from any terminal.
Can a site use Brevo without showing any signal on the website?
Yes. If a business uses Brevo only for email marketing or transactional email and has not embedded the chat widget, tracking script, or forms, there may be no visible fingerprint on the public web pages. In that case the platform reveals itself through the emails it sends, the sending infrastructure, link-tracking domains, and unsubscribe links typically point to Brevo/Sendinblue hosts, which is why email-header inspection is part of a thorough check.
Does the Brevo chat widget affect page performance?
The chat widget and tracking script are third-party resources, so they add some weight to the page, like any embedded widget. They are generally loaded asynchronously to avoid blocking the main content, and the impact is usually modest relative to heavier ad or media scripts. Site owners who are performance-conscious sometimes load the widget conditionally or through a tag manager to control when it initializes.
Want to detect Brevo and the rest of a site's marketing and support stack automatically? Run any URL through StackOptic at https://stackoptic.com.