Klaviyo vs Brevo for Shopify Brands: Per Contact vs Per Send

Klaviyo is a Shopify-native ecommerce marketing platform priced per contact stored. Brevo, formerly Sendinblue, is a bundled email, SMS, chat, and CRM suite priced per email sent. Klaviyo wins on ecommerce depth; Brevo wins on cost and on breadth outside ecommerce. Both meters bill for activity, not results. The newer option is autonomous decisioning.

We build the autonomous option, so read this as informed but interested. The comparison below is fair to both incumbents, including where each one beats us on its own terms. The reframe at the end is ours.

Where Brevo wins

• You pay for sends, not for storage. A large, partly dormant list costs nothing to keep. For a lot of brands that single difference decides the bill.
• Channels come bundled. Email, SMS, WhatsApp, live chat, and a light CRM sit inside one subscription instead of arriving as separate line items.
• Marketing and transactional on one platform. Receipts, password resets, and campaigns share the same SMTP and API, which suits a small engineering team.
• It is not ecommerce-first, and that is sometimes the point. Service businesses, B2B, marketplaces, and mixed models fit Brevo more naturally than a store-shaped tool.
• Low entry cost. The free and starter tiers are generous, and the curve stays gentle as the contact list grows.

Where Klaviyo wins

• Shopify-native data. Orders, browse events, checkouts, and the product catalog sync without middleware, and segments act on that behavior directly.
• Ecommerce-shaped automation. Cart, browse, post-purchase, and win-back flows ship as templates that already understand a store.
• Revenue-attributed reporting. Klaviyo reports dollars per flow and per campaign, which is the number a DTC operator actually gets asked about.
• Ecosystem. A deep bench of agencies, apps, and integrations built specifically around Klaviyo on Shopify.

The honest read on each. Brevo’s ecommerce depth is thinner: product-level personalization, catalog logic, and revenue reporting are workable but not where Klaviyo is, and a $20–100M GMV Shopify brand will feel that gap inside a month. Klaviyo’s weakness is its meter: the bill tracks contacts retained, so the list you are afraid to prune is a recurring cost. Neither of those is a defect. Each is the shape of the product.

Two meters, and neither one is revenue

This is the part worth sitting with. Brevo charges by emails sent. Klaviyo charges by contacts stored. Both are legible, defensible pricing models, and both quietly shape behavior.

A send meter rewards sending less. That sounds like discipline, and occasionally it is, but a team under a send cap usually sends fewer emails rather than better ones. A contact meter rewards list hygiene, which is genuinely healthy, and it also charges rent on people who never receive a message. Either way the invoice reads the same whether the campaign earned anything or not. It is worth modelling Klaviyo’s pricing against your own list and send pattern before switching to either basis, because the cheaper meter depends entirely on which of those two numbers is growing faster.

The deeper issue is that both meters price the work, and the work is the constraint. Someone still designs the flow, writes the branches, picks the wait times, and revisits all of it every quarter. Brevo and Klaviyo disagree about what to charge for that. Neither changes the fact that a person is doing it.

What both share: the decision was made weeks ago

Under the interface, Brevo automations and Klaviyo flows are the same architecture. An event fires, a timer runs, a message goes out. The branching is real and both execute it competently. But every decision inside was made by a marketer weeks earlier, in a builder, without the shopper in front of them. One flow sends the same sequence to everyone who enters it. When results plateau, the standard answer is more flows, more branches, more variants, which is more of the same work on the same architecture.

The alternative: Observe → Decide → Act

Relvino is not another builder. It runs a different loop. It observes live shopper signals, decides the offer, timing, and channel for that one shopper in about 80 milliseconds, and acts across email, SMS, and on-site. Guardrails get set once, including margin floors, channel rules, send frequency, and brand voice, and 100% of flows run without a human in the loop.

The engine is a Large Retail Model trained on 7M+ data points across 10K+ retailers and 1.78M shoppers, so it starts with priors about what works in a category instead of learning a store from zero. Brands moving off Klaviyo see 3× ROI in 30 days, 4× revenue uplift year over year, and 80% less spam, on a bill that runs 3–7× cheaper than Klaviyo.

Klaviyo vs Brevo vs Relvino at a glance

• Built for · Klaviyo: Shopify ecommerce · Brevo: All-round email, SMS, chat and CRM · Relvino: Shopify ecommerce, run autonomously
• Pricing meter · Klaviyo: Contacts stored · Brevo: Emails sent · Relvino: Weighted to outcomes, 3–7× cheaper than Klaviyo
• Core model · Klaviyo: Hand-built flows · Brevo: Hand-built automations · Relvino: Autonomous decisions
• Loop · Klaviyo: Trigger → Wait → Send · Brevo: Trigger → Wait → Send · Relvino: Observe → Decide → Act
• Ecommerce data depth · Klaviyo: Deep and Shopify-native · Brevo: Serviceable, not store-shaped · Relvino: Deep, plus cross-retailer priors
• Personalization · Klaviyo: Segment-level · Brevo: Segment-level · Relvino: 1:1 per shopper in ~80ms
• Who runs it · Klaviyo: A marketer in a flow builder · Brevo: A marketer in an automation builder · Relvino: Guardrails you set once

So which should you choose?

A decision rule that holds up: pick the meter that matches your behavior. If the list is large and mostly dormant and sends come in bursts, Brevo is cheaper and the bundled channels are real value, especially when the business is not purely ecommerce. If revenue comes from Shopify behavior, carts, browse, catalog, and repeat purchase, Klaviyo’s depth earns its contact meter and Brevo will feel thin by month two. For the same shape of decision against a cheaper ecommerce-native tool, Klaviyo vs Omnisend is the closer comparison, and the wider Klaviyo competitor landscape maps the rest of the field.

There is a third case, and it is the common one at $20–100M GMV. The flows are already built, the team is lean, and the numbers have been flat for three quarters. In that case the tool is not the constraint, and switching meters will not move it. That is what autonomous decisioning is for. Check pricing, or run a 14-day pilot alongside what you already have and compare revenue directly.

Frequently asked questions

Who competes with Klaviyo?

The useful way to sort Klaviyo’s competitors is by what they charge for. Billed per contact stored: Klaviyo, Mailchimp, Constant Contact. Billed by send volume: Brevo and most SMTP-first providers, with SMS-first tools such as Attentive billing per message. Also billed per contact stored: Omnisend. Every one of those meters prices activity. Relvino competes on a different axis, replacing the flow stack with autonomous decisioning rather than offering a cheaper way to build the same flows.

What are the weaknesses of Klaviyo?

Set against Brevo, three stand out. First, the contact meter: Klaviyo bills for people on the list whether or not they are mailed, so unpruned growth is a standing cost and list hygiene turns into a budget exercise. Second, channels are largely add-ons, where Brevo folds SMS, chat, and a light CRM into the same plan. Third, and biggest, Klaviyo sells a builder, so flows improve only when somebody sits down and improves them. That third one does not get fixed by moving to Brevo, because Brevo sells a builder too.

Who is Klaviyo owned by?

Klaviyo is a publicly traded company, so it is owned by its shareholders rather than by a parent. It was founded in 2012 by Andrew Bialecki and Ed Hallen and listed on the New York Stock Exchange in 2023 under the ticker KVYO. Shopify is an investor and a close integration partner, not the owner. Brevo is the opposite case: privately held, headquartered in France, and renamed from Sendinblue in 2023.

What are the top 3 email marketing tools?

There is no single top three, only a top three per constraint. For Shopify data depth, Klaviyo is still the default. For cost at high send volume with channels bundled in, Brevo. For a middle path with ecommerce features at a lower price, Omnisend. All three are builders, so choosing among them is really a choice about who pays for what: contacts, sends, or a plan tier. A brand whose actual problem is flat flow revenue rather than tooling cost is choosing on the wrong axis.

How long does it take to migrate from Klaviyo to Relvino?

The technical cutover takes about 30 minutes: authenticate the sending domain, install the Shopify app, and historical data ingests on its own. Nothing is rebuilt, because there are no flows to recreate. Revenue runs on a different clock. Run a 14-day pilot with Klaviyo paused rather than cancelled, and compare the two side by side before making the call.