For E-commerce Brands Doing $50K+/Month

Scale your profits,
not your ad spend.

We turn the customers you've already paid for into 25–40% more monthly revenue through done-for-you email & SMS — flows, campaigns, and list growth that compound every month.

Apply for a Free Audit See How It Works
Free retention audit with a custom revenue roadmap — no commitment.
$3M+
Attributed revenue generated
42%
Peak revenue share from email
+724%
Best YoY attributed growth
<2 wks
From kickoff to live
Trusted by
Revenge X Body Cloud Nine Proper Kicks Losveo Tuned in Tokyo Drip Nation
The Problem

Your biggest growth lever isn't more ad spend.

It's the customers you've already paid to acquire. Every month, most brands leave 25–40% of potential revenue sitting untouched in their existing customer list.

Rising ad costs mean acquisition alone can't carry your growth. But when retention works, customer value compounds — LTV climbs, repeat orders stack, and every dollar of ad spend suddenly buys you more.

That's the machine we build. Not "pretty emails" — a retention system engineered around profit.

What we do

Everything your retention channel needs. Handled.

Strategy, copy, design, and execution — one team owning your entire email & SMS operation end to end.

Email Flows & Automation

Welcome series, abandoned cart, browse abandonment, post-purchase, win-back — automated sequences that sell while you sleep.

SMS Marketing

Compliant, high-converting text campaigns and automations that reach customers where they actually look — their phone.

List Growth & Pop-ups

On-brand sign-up forms and pop-ups optimized to capture more subscribers without hurting your conversion rate.

Campaign Strategy & Copy

A full monthly campaign calendar — promos, launches, and content emails written to sound like your brand and drive clicks.

Design That Converts

Custom email templates built for mobile, brand consistency, and one job above all — getting the click.

Deliverability & Reporting

Inbox placement monitoring, list hygiene, and clear monthly reports — you'll always know exactly what your retention channel earns.

Comparison

Why brands choose Knox over other agencies.

Other Agencies

  • ✕ Template emails recycled across every client
  • ✕ 4–6 week setup before anything goes live
  • ✕ North star: vanity "attributed revenue"
  • ✕ Long-term lock-ins and hidden fees
  • ✕ No skin in the game — you carry all the risk
  • ✕ Slow replies, monthly check-ins at best

Knox Retention

  • ✓ Custom strategy built from your brand & customer data
  • ✓ Core flows live in under 2 weeks
  • ✓ North star: profit, LTV & repeat purchase rate
  • ✓ Monthly contracts. No hidden fees. Leave anytime.
  • ✓ Performance guarantee — we win when you win
  • ✓ Direct line to your team, always responsive
Retention Growth System

How we scale your brand profitably.

01

Deep Research

Before we touch your account, we learn your brand inside out.
  • Customer avatar, desires & objections mapped
  • Full audit of your current email & SMS setup
  • Competitor gap analysis
  • Every flow starts from real intelligence, not templates
02

Build & Launch

Strategy becomes execution — in under 2 weeks.
  • Full setup: flows, campaigns, segmentation
  • Copywriting & design handled end-to-end
  • Deliverability protected from day one
  • AOV & LTV mechanisms baked into every touchpoint
03

Optimize & Scale

Where most agencies stop is where we compound.
  • A/B testing & flow refinement every month
  • Segmentation powered by customer data
  • New flows added as your brand grows
  • Clear monthly profit & LTV reporting
Case Studies

Real dashboards. Real revenue.

Straight from our clients' Klaviyo accounts — receipts, not mockups.

Email Marketing12 Months
Revenge X Body
A multi-million dollar retention system

We rebuilt this brand's entire email engine while the store scaled to a breakout year — flows selling on autopilot, campaigns compounding on top.

$17.5M+
Total store revenue
$3.02M
From email marketing
+724.7%
YoY email growth
75.4%
From automated flows
View full case study →
Klaviyo growth overview showing $17,565,375.80 total revenue, up 773.7%, with $3.02M attributed revenue up 724.7%
Klaviyo dashboard showing email driving 42.27% of total monthly revenue
Email Marketing
Cloud Nine
Pushed email to 42% of total revenue
42.27%
Email share of revenue
+92%
Attributed growth
$33.3K
Email revenue / month
45%
From automated flows
View full case study →
Klaviyo dashboard showing $333,099 attributed revenue in January, up 1754% vs previous period
Email MarketingPeak Season
Proper Kicks
Near-zero email to $694K in five months
+1,937%
Peak monthly growth
$366K
Best single month
$694K
Attributed Jan–May
78%
Peak flow share
View full case study →
Klaviyo dashboard showing 27.43% revenue attribution with total revenue up 346%
Email MarketingHypergrowth
Losveo
Retention scaling through a 346% growth month
27.43%
Email share of revenue
+436%
Attributed growth
$96.3K
Email revenue / month
60%
From automated flows
View full case study →
Klaviyo growth overview showing $693K total revenue up 465.4% with $117K attributed revenue up 430.4%
Email MarketingShopify
Tuned in Tokyo
Email share doubled to 21.9% in 30 days
9.6% → 21.9%
Email share, in 30 days
+430.4%
Attributed growth, H1
$117.3K
Attributed Jan–Jun
79.9%
From automated flows
View full case study →
Recent Designs

Design that looks good — and sells better.

Every email is custom-built for the brand: mobile-first, on-voice, and engineered for the click.

Reviews

Hear from the brands we've scaled.

★★★★★
"Email went from an afterthought to our most profitable channel. They handle everything — I just get a report on the KPIs."
Client Name Founder, Apparel Brand
★★★★★
"It actually feels like having partners, not an agency. Responsive, consistent, and they genuinely care about our numbers."
Client Name Founder, Beauty Brand
★★★★★
"One of the only agencies that's made us more than we've spent on them — and it hasn't been close."
Client Name Founder, DTC Brand
Zero Risk

If we don't grow your backend revenue in 90 days, we work free until we do.

We know what works — and we're willing to put our own time on the line to prove it. You carry none of the risk.

Apply for a Free Audit
FAQ

Questions, answered.

What results can I expect in the first 90 days?
Core automated flows go live within the first 2 weeks and typically start producing revenue immediately. By day 90, most clients see a meaningful lift in email/SMS-attributed revenue — which is exactly why we're comfortable guaranteeing it.
What if we've worked with an agency before and it didn't work?
You're exactly who we built our process for. Most agency relationships fail because of template strategies and vanity reporting. We start with deep research on your brand and customers, report on profit and LTV — not just "attributed revenue" — and back it with a performance guarantee.
What's the time commitment on our end?
About 30 minutes a week. We handle strategy, copy, design, build, and reporting — you review and approve. No micromanaging required.
Which platforms do you work with?
All major email & SMS platforms — including Klaviyo, Omnisend, Mailchimp, Attentive, and Postscript. If you're not set up yet, we'll recommend and configure the right stack for your brand.
Is SMS marketing compliant?
Absolutely. Every SMS program we run follows opt-in consent, quiet hours, and carrier compliance requirements (TCPA/CTIA), so your brand grows the right way.
Are there long-term contracts?
No. We work on monthly contracts with no hidden fees and no lock-ins. We'd rather keep you with results than with paperwork.
Get started

Your brand is probably sitting on 25–40% more revenue right now.

Let's find it and unlock it. Apply for a free audit — even if we never work together, you'll walk away knowing exactly what your retention channel could earn.

✓ Free retention audit with a custom revenue roadmap
✓ Custom 90-day plan built for your brand
✓ Dedicated team live in under 2 weeks
Book Your Free Audit Call
30 minutes · Google Meet · Or email us at hello@knoxretention.com