A boutique retention agency that acts like it's your team.
We're a small, specialist Klaviyo agency for ecommerce brands. While other agencies spread themselves across ten channels, we go deep on the one that quietly out-earns them all — owned email and SMS — and we treat your revenue like it's our own.
- 14+ ecommerce brands scaled
- +1598% top lift in flow revenue
- 5.0★ across our Google reviews
The people behind Flow Butler.
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Marc Napoli
Systems & Operations
Marc spent nearly two decades building systems in IT before he opened a Klaviyo account. It shows in what he asks first, which is how a thing is wired rather than what it says. Most brands run email on instinct. A Tuesday newsletter, a discount code, hope. He builds the opposite: flows you can open up and inspect, segmentation and suppression logic that holds, deliverability groundwork nobody notices until it fails, attribution clean enough that nobody has to squint at a dashboard. He also runs the rhythm behind every Flowbutler account, the frameworks, the QA, the reason work lands when it is meant to and nothing goes out half checked. He is slow about the parts most agencies rush. That is generally why the numbers move at all.
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Sue Napoli
Strategy & Design
Sue is an award-winning interior designer and a Dulux Colour Awards finalist, and she thinks about email the way she thinks about a room. Someone moves through it, and how they feel on the way is the whole point. She decides what a brand says, in what order and to whom, then makes it look like the brand instead of a template with a logo dropped in. She also runs the numbers, which is a rarer pairing than it sounds. Most email underperforms because the thinking behind it was thin, not because the send was late. Sue starts at the thinking.
The principles behind the results.
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We’ll push back
Clients tell us it’s why they stay. We’ll tell you what actually moves revenue — not what’s easiest to build, and not just whatever you asked for. If a send will hurt your brand or your inbox placement, we’ll say so.
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The client comes before the badge
We’re a Klaviyo Partner, but we’re never in it for the status. Every call comes down to one question: what’s best for your brand? Sometimes that means telling you not to send.
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Boutique on purpose
We stay small and specialist so you get senior people who know your account, your numbers, and your customers — not a junior running templates behind a big logo.
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Honest reporting, every month
You get the real numbers — the wins and the “we could’ve gone harder.” We report on revenue-per-recipient and attribution, the figures that show up in your own dashboard, not vanity open rates.
See exactly where your flow revenue is leaking.
A no-pitch teardown of your Klaviyo account. We show you the gaps, the fixes, and the revenue on the table — whether you work with us or not.
Book your free flow audit- The exact revenue leaks in your current flows
- Which flows you're missing that your brand needs
- How to re-engineer them for maximum conversion
- How 7–8 figure brands turn flows into their top channel