What does a Klaviyo agency do?

It builds and runs the email flows and campaigns that bring customers back to an ecommerce store. Rembanx writes them from your customer research and builds them in your own Klaviyo account.

Which Klaviyo flows do you build first?

Five: welcome, browse abandonment, abandoned checkout, post-purchase and winback. Together they cover a buyer from first visit to second order.

When can I add Klaviyo on Growth or Foundation?

From day 90. At your day-90 review we compare your numbers with the baseline taken at kickoff, and if they say so, you can add Klaviyo then.

Do I need a Klaviyo account already?

It helps, but no. You pay for Klaviyo directly so the account stays yours, and we help you set it up if you do not have one.

Will the emails sound like my brand?

Yes. They are written from your brand brain, which holds your tone of voice, your claims rules and the phrases your own customers use.

What do I own if I stop?

Everything. The engine, the skills, the playbooks and every page stay in your accounts. Month to month, you can stop with a month's notice. Leave a plan early and the build fee you saved falls due, less a sixth for each month you have paid.

Rembanx
Klaviyo agency

Klaviyo email marketing for ecommerce

Klaviyo agency for ecommerce brands: turn a first order into a second.

Search brings the first order. Email brings the next one. Rembanx builds and runs Klaviyo flows and campaigns for Shopify brands, written from your brand brain so every email sounds like you and answers what your buyers ask. It is included on Flagship and an add-on from day 90 on Growth and Foundation, where five core flows are built free when you commit to 12 months.

Book a build call Get a free SEO audit

Commit to 12 months on Growth or Foundation and five Klaviyo flows are built free.

5 weeksfrom kickoff to a live engine in your accounts

14 daysto five revenue fixes on the traffic you already have

+85%Google clicks on the founder's own Shopify store, June to October 2026

What the retention agent deliversInventory

01Five core flowsWelcome, browse, checkout, post-purchase, winbackBuilt in your Klaviyo
02CampaignsWritten from your brand brainMonthly on Flagship
03Your approvalBefore anything is switched onEvery time
04Repeat purchase, reviewedIn your monthly growth reviewEvery month

Built inYour Klaviyo

Flows are built free on a 12-month Growth or Foundation plan. Flagship includes Klaviyo throughout.

Why Klaviyo sits inside the engine

Search wins the first order. Email wins the second.

A Klaviyo agency builds the emails that bring a customer back. Inside the engine, those emails are written from the same customer research as your pages.

Post-purchase flowIllustration

TriggerA first order is placedRead from Shopify
Day 0Thank you, in your voice
Day 7How to get the most from it
Day 21Review request, then the next product
ThenThe review is saved to your brand brainSo the next page and the next email can use it
GoalA second order

An illustration of one of the five flows. The flow is chosen for the product that was bought.

Organic growth needs retention
New pages win a first order. Flows are what turn it into a second, so the engine treats email as part of organic growth, not a separate channel.
Written from your brand brain
Every flow draws on the same research as your pages: your reviews, the objections buyers raise and the moments that make them buy.
Built in your account
Flows are built in your own Klaviyo, so they keep running if you ever stop working with us.

How the engine runs Klaviyo

Flows first, then campaigns.

The retention agent is a Claude skill connected to your Klaviyo account.

Step 1Read what is thereYour current flows and offers are read as part of the revenue audit, before anything new is written.
Step 2Write the flowsWelcome, browse abandonment, abandoned checkout, post-purchase and winback, written from your brand brain.
Step 3You approveNothing is switched on without your sign-off.
Step 4Send campaignsOn Flagship, or with the add-on, campaigns are written from your brand brain every month.
Step 5Review the numbersRepeat purchase is part of your monthly growth review, next to search and conversion.

The five flows

One buyer, five moments.

Each flow starts at a moment in a buyer's life with your store, and has one job.

WelcomeStarts when someone joins your listTell your story and show what buyers love first
Browse abandonmentStarts when a visitor looks at a product and leavesBring them back to what they viewed
Abandoned checkoutStarts when a buyer begins checkout and stopsAnswer the last objection
Post-purchaseStarts when a first order is placedHelp them get the most from it, then ask for a review
WinbackStarts when a customer goes quietGive them a reason to come back

On Flissie, the founder's own Shopify store, returning customers rose 29%, from 239 to 309 (January to October, 2025 against 2026, Shopify analytics). One store's numbers, not a promise, and email is one of several reasons customers come back.

Klaviyo in each plan

Included, added or built free.

How Klaviyo reaches you depends on your plan and your term.

Flagship

£9,950a month

Klaviyo flows and campaigns included
Written from your brand brain, every month
Commit 12 months: month 13 free

Growth

£3,950a month

Five core flows built free on a 12-month plan
Flows and campaigns as an add-on from day 90, £1,250 a month

Foundation

£2,450a month

Five core flows built free on a 12-month plan
Flows and campaigns as an add-on from day 90, £1,250 a month

Klaviyo agencies charge $500 to $2,500 to build each flow (Excelohunt, 2026). You pay for Klaviyo itself directly, so the account stays yours. See full pricing.

Built on a real store first

The first engine runs on my own Shopify brand

Rembanx is new, so here is the honest version. When Flissie, the Shopify brand I run, lost half its Google traffic in February 2026, I rebuilt its SEO as an engine on Claude. These are its real numbers since.

Women's bamboo boxer shorts. Family run, on Shopify, trading since 2021. Figures compare June 2026, the month before the engine went in, with October 2026.

+85%Google clicks a month, 1,282 to 2,370

+117%search terms ranking in Google's top 10, 2,501 to 5,439

+47%search terms in positions 1 to 3, 1,006 to 1,479

+68%citations in AI answers, 847 to 1,420. In ChatGPT alone, +337%

97%of store visits came from unpaid channels in October 2026: search, direct, email and AI. A year earlier, with Meta ads running, it was 59%

+29%returning customers, January to October, 239 in 2025 to 309 in 2026

Google clicks to flissie.com by week, 4 May to 1 November 2026. Coral bars are weeks with the engine running.

MayJulySeptemberOctober

What comes next. With clicks rising, the engine's work on Flissie has moved to the pages that sell: collection pages, product pages, conversion and email.

Sources: Google Search Console (clicks, search terms by position), Ahrefs (AI citations across ChatGPT, Google AI Overviews and AI Mode, Gemini, Perplexity and Copilot, 30 June against 8 November 2026) and Shopify analytics (visits, orders, returning customers). One store's numbers, not a promise.

Matthew Banks, founder

I am an ecommerce brand owner first. I run Flissie, a family-run Shopify store that has shipped 3,596 orders, so I look at the same Shopify, Search Console and Klaviyo dashboards you do.

I have lived the Meta cycle: ROAS halves overnight, the creatives run out, and a record sales month leaves nothing to pay yourself. Then, in February 2026, our Google traffic halved. So I built the engine on my own store first, and I still run it there every week.

Every plan includes me, not an account manager: strategy calls, a WhatsApp line for ideas and decisions, a monthly growth review on your Shopify numbers and a 90-day plan each quarter.

The Flissie engine, today

Runs on: Claude
Connectors: Shopify, Ahrefs with Search Console, Klaviyo, Canva
Skills: Brand brain, SEO content, digital PR, retention, growth review, blog banners, demand

Questions

What ecommerce brands ask a Klaviyo agency

What does a Klaviyo agency do?: It builds and runs the email flows and campaigns that bring customers back to an ecommerce store. Rembanx writes them from your customer research and builds them in your own Klaviyo account.
Which Klaviyo flows do you build first?: Five: welcome, browse abandonment, abandoned checkout, post-purchase and winback. Together they cover a buyer from first visit to second order.
How much does a Klaviyo agency cost?: Klaviyo agencies charge $500 to $2,500 to build each flow (Excelohunt, 2026). With Rembanx the five core flows are built free on a 12-month Growth or Foundation plan, Klaviyo is included on Flagship, and it is an add-on at £1,250 a month on Growth and Foundation. See full pricing.
When can I add Klaviyo on Growth or Foundation?: From day 90. At your day-90 review we compare your numbers with the baseline taken at kickoff, and if they say so, you can add Klaviyo then.
Do I need a Klaviyo account already?: It helps, but no. You pay for Klaviyo directly so the account stays yours, and we help you set it up if you do not have one.
Will the emails sound like my brand?: Yes. They are written from your brand brain, which holds your tone of voice, your claims rules and the phrases your own customers use.
What do I own if I stop?: Everything. The engine, the skills, the playbooks and every page stay in your accounts. Month to month, you can stop with a month's notice. Leave a plan early and the build fee you saved falls due, less a sixth for each month you have paid.

One engine, every job.

This is one part of the engine. The same build covers the searches that bring buyers in, the pages that convert them and the emails that bring them back.

01Shopify SEO

Shopify SEO that ends in an order

Collection and product pages, technical fixes, internal links and schema, aimed at the searches buyers make right before they buy.

Shopify SEO agency

02GEO and AEO

AI search optimisation

Get recommended in ChatGPT, Claude, Gemini, Perplexity and Google AI Overviews, with a weekly check on who gets named for your top buying questions.

GEO agency for ecommerce

03Ecommerce SEO

Content that sells, not just ranks

Buying guides, comparisons and gift guides written from your own reviews and published straight to your Shopify blog.

Ecommerce SEO agency

04Revenue

More orders from the traffic you have

Your homepage, top collections, product pages and cart rewritten in your buyers' words, and your offers and repeat purchase flows fixed. Five fixes live in 14 days.

Ecommerce CRO agency

05Research

Messaging in your customers' own words

Reviews, support emails, returns reasons and community threads mined for how your buyers talk, then turned into personas, Chimp OS and a messaging system every page uses.

The thirteen parts

06Growth partner

A founder on WhatsApp, not an account manager

A strategy call with Matthew every week or fortnight, a WhatsApp line for ideas and decisions, a monthly growth review and a 90-day plan each quarter.

Work with Matthew

07Landing pages

Pages designed to convert

A UI and UX agent designs every landing page, collection and guide around the buying decision: what a visitor sees first, the proof beside it and one clear next step.

What is included

08Digital PR and Klaviyo

Links in, second orders out

Gift guides, journalist requests and link gaps pitched in your voice, and Klaviyo flows that turn a first order into a second. Included on Flagship, add-ons from day 90.

Digital PR Klaviyo agency

09Claude SEO

An engine you can see inside

Every skill, playbook and schedule lives in your Claude account, so you can read exactly how the work is done and keep it if you leave.

Claude SEO agency

Book a build call

Stop renting growth. Own the engine.

Thirty minutes with Matthew. Bring your Shopify numbers and what you have tried. You leave with a spec for your engine, whether or not we build it. Two new partners a month, with builds starting on the first Monday. The £0 build fee offer ends 31 January 2027.