How to Tell If a Website Uses Brevo (formerly Sendinblue)

Brevo — formerly Sendinblue — is an affordable, all-in-one platform for email, SMS, chat and marketing automation, popular with small and mid-sized businesses, especially across Europe. To tell whether a site uses it, the quickest answer is to look for form embeds from sibforms.com and the site tracker from sibautomation.com. This guide covers every reliable signal, the all-in-one model behind them, and what a Brevo integration tells you about the business.

What is Brevo (Sendinblue)?

Brevo, founded in 2012 as Sendinblue and rebranded in 2023, is a marketing platform that bundles email campaigns, transactional email, SMS marketing, live chat, a light CRM and marketing automation into one affordable suite. Its appeal is value and breadth: a small business can run several marketing channels from one tool, with a generous free tier and pricing based on email volume rather than contact count. It has particularly strong adoption in Europe, where it is headquartered (in France), and it competes with Mailchimp and ActiveCampaign for the SMB segment.

For detection, the key context is that Brevo signals a cost-conscious small-to-mid business consolidating channels — one that wants email, SMS and perhaps chat and automation without paying for separate tools. Its on-site footprint comes from signup forms hosted on sibforms.com and site tracking from sibautomation.com. Because of the Sendinblue heritage, both still use the legacy "sib" prefix, which is a distinctive and reliable fingerprint.

How Brevo appears on a website

Brevo's forms are hosted on sibforms.com. Embedded signup forms load from and submit to sibforms.com/serve/<account>/<form> URLs that carry the account and form identifiers, and the form markup is recognisably Brevo/Sendinblue. Its site tracking and automation load a script from sibautomation.com, which exposes a global (historically Sendinblue, with sib-prefixed objects/queues) used to identify visitors, track page views and events, and feed marketing automations.

Because Sendinblue rebranded to Brevo, you will see a mix of legacy sib-prefixed assets (sibforms.com, sibautomation.com) and newer brevo.com references; they are the same platform. Brevo's optional chat widget and transactional email are additional surfaces, though the forms and automation tracker are the most common on-site signals. Knowing these — the sibforms.com forms, the sibautomation.com tracker, and the Sendinblue/sib globals — makes Brevo straightforward to confirm.

How to tell if a website uses Brevo

Confirm at least one strong signal.

1. Check the Network tab. Filter for sibforms or sibautomation. A form from sibforms.com or a tracker from sibautomation.com is definitive.

2. View the source. Search for sibforms, sibautomation, sendinblue or brevo. The form embed and the automation script confirm the platform.

3. Use the console. Type Sendinblue (or look for sib-prefixed globals) and press Enter. A returned object confirms Brevo's tracking is loaded.

4. Inspect the signup form. A form loading from or submitting to sibforms.com/serve/... confirms Brevo and identifies the account and form.

5. Look for the chat widget. If Brevo's chat is enabled, its widget is an additional confirmation alongside the form and tracker.

What the Brevo signals look like

<script src="https://sibforms.com/forms/end-form/build/main.js"></script>
<form action="https://sibforms.com/serve/MUIF…" method="POST">
<script src="https://sibautomation.com/sa.js?key=…"></script>
window.Sendinblue = { … }   // sib-prefixed tracking objects

The combination of a sibforms.com form and the sibautomation.com tracker (with the Sendinblue/sib globals) is conclusive.

Brevo versus other email tools — avoiding false positives

Match the host to keep platforms distinct. Brevo uses sibforms.com and sibautomation.com; Mailchimp uses list-manage.com and chimpstatic.com; ActiveCampaign uses activehosted.com and trackcmp.net; Klaviyo uses static.klaviyo.com. The sib prefix on sibforms.com/sibautomation.com is unique to Brevo/Sendinblue. The main subtlety is the rebrand: do not treat Sendinblue and Brevo as different tools, and expect legacy sib-prefixed assets even on sites that otherwise say "Brevo". A business might also use Brevo for transactional email only (server-side), leaving little on-site footprint — in that case the forms or automation tracker may be the only visible signal, which is still sufficient.

How reliable is each Brevo signal?

A sibforms.com form and a sibautomation.com tracker are both definitive. The Sendinblue/sib globals are strong confirmation. References to brevo.com corroborate post-rebrand. The weakest situation is a site using Brevo purely for transactional or back-office email with no on-site forms or tracking — there, on-site detection may not be possible. As a rule, the sibforms.com form or the sibautomation.com tracker settles it.

What a Brevo integration reveals about a business

Finding Brevo signals a cost-conscious small-to-mid-sized business consolidating marketing channels — email plus, often, SMS, chat and automation — in one affordable suite. The profile skews toward European SMBs, local businesses, and value-oriented companies that prefer one tool over a stack of specialists. The presence of the automation tracker indicates behaviour-based marketing, while the chat widget suggests on-site engagement. If you sell marketing tools, automation consulting, or services aimed at growing SMBs, a Brevo user is a reachable, budget-aware, marketing-active prospect — and one that may be open to add-ons that Brevo does not cover well. Given Brevo's European strength, its presence can also hint at the business's market and its attention to GDPR-friendly tooling.

What finding Brevo means for sales, agencies and competitive research

For sales and prospecting, Brevo marks a value-oriented SMB that already does multi-channel marketing — a fit for tools and services that complement an all-in-one suite, or that help a growing business graduate to more specialised platforms. The channels in use (email only, or email plus SMS and chat) indicate how broad their marketing is.

For agencies and consultants, finding Brevo tells you the client values consolidation and affordability, so engagements can focus on getting more from the existing suite — better automations, SMS, chat — or, for a scaling business, a considered migration. It also signals an email list and automation setup to build on.

For competitive and market research, Brevo's prevalence in a sector (especially a European one) indicates SMB-level marketing maturity and budget-consciousness. Spotting a competitor on Brevo versus an enterprise platform tells you roughly how resourced their marketing is, useful when benchmarking reach and sophistication.

Brevo in the wider marketing stack

Brevo's all-in-one positioning means its presence often explains the absence of several other tools, so reading the surrounding stack is especially telling. A business running Brevo may handle email, SMS, chat and basic automation from that one platform, so you might not find separate specialist tools for each channel — the consolidation is the point. On a small ecommerce store, Brevo may sit alongside the platform's native features, handling marketing email and perhaps abandoned-cart flows; on a service or local business, it often pairs with a simple website, a booking or contact tool, and analytics.

The Brevo features in evidence refine the read. The site-tracking script (sibautomation.com) indicates behaviour-based automation rather than broadcast-only email; the optional chat widget signals on-site engagement; and SMS or transactional usage points to a business using Brevo across multiple channels. Given Brevo's European roots, you will also frequently find GDPR-conscious tooling — a consent-management platform and privacy-respecting analytics — alongside it. For an auditor, the valuable details are which Brevo channels appear active (email, SMS, chat, automation), the host platform, and the privacy and analytics tools present; together these reveal a value-oriented business consolidating its marketing into one affordable suite and roughly how broadly it uses that suite.

A quick Brevo confirmation walkthrough

Open the site with developer tools on the Network panel and filter for sib — look for a form from sibforms.com and a tracker from sibautomation.com. Switch to the Console and type Sendinblue (or scan for sib-prefixed globals) to confirm tracking. Find a signup form and check whether it loads from or submits to sibforms.com/serve/.... View the source for brevo or sendinblue references. Any one of the sibforms.com form, the sibautomation.com tracker, or the Sendinblue global confirms Brevo.

A quick Brevo detection checklist

• Filter the Network tab for sibforms/sibautomation — conclusive on its own.
• Inspect the signup form for a sibforms.com/serve/... action.
• Type Sendinblue (or scan for sib globals) in the console.
• Search the source for brevo, sendinblue, sibforms, sibautomation.
• Treat Sendinblue and Brevo as the same platform (2023 rebrand).
• Check for the optional Brevo chat widget as corroboration.

Detecting Brevo at scale

Checking one site is quick, but finding every Brevo user across a list — to prospect value-oriented SMBs, especially in Europe — calls for automation. StackOptic detects Brevo (Sendinblue) and thousands of other technologies from a real browser, recognising both legacy sib-prefixed and newer brevo.com signals. For related reading, see our guide to finding what email marketing platform a website uses and the full Brevo technology profile.