The short version
Everboost is a UK retention marketing agency for 7-8 figure health and wellness ecommerce brands. We build the whole retention system, email, SMS, direct mail and subscriptions on top of unified customer data, and we are measured on repeat orders, second-order rate and customer lifetime value rather than opens and clicks.
What does a retention marketing agency do?
A retention marketing agency grows the revenue you earn from customers you already have. In practice that means three layers of work. First, diagnose: audit the customer data, the offer, the subscription programme and every message currently going out, to find where repeat revenue leaks. Second, build: the flow library, the campaign calendar, the subscription fixes and the post-purchase experience that close those leaks. Third, compound: testing, reporting and quarterly strategy so the engine keeps improving instead of decaying. At Everboost that system is called the Retention Engine, and it is the only thing we do.
How is a retention partner different from an email agency?
An email agency executes campaigns and flows and reports channel metrics like opens, clicks and platform-attributed revenue. A retention partner owns the strategy across the offer, the second order, the subscription programme and the customer data, and reports the numbers with commercial impact: repeat orders, second-order rate, customer lifetime value and churn. We build a lot of email and SMS, it is the visible layer of the engine, but the reason the numbers move is the engineering underneath it.
Platforms are moving the same way. Klaviyo, the platform most of our clients run on, now positions itself as a B2C CRM rather than an email tool: one customer data platform underneath marketing, analytics and service. That is precisely how a retention partner should treat it, and precisely what most brands' setups do not yet do.
Where retention revenue leaks
Four patterns show up again and again in the brands that come to us:
- Leak 01
The leaky bucket
Acquisition keeps growing, repeat revenue stays flat. Every month starts from zero because customers pour in and quietly drain out.
- Leak 02
The one-and-done base
Most customers never place a second order, and nothing in the current setup is engineered to change that.
- Leak 03
The discount spiral
The only lever anyone pulls is a bigger code, training customers to wait and margins to shrink.
- Leak 04
Set-and-forget flows
Automations built at launch, never revisited, quietly underperforming against how customers actually reorder today.
What results does retention marketing deliver?
Every number below is verified client data from a full case study on this site.
+227%subscription orders in year oneRead the full story → 
22% → 56%returning-customer share of revenue in 8 monthsRead the full story → 
+58%returning customer sales in 12 monthsRead the full story → 
+220%net subscriber growth in 6 monthsRead the full story → The pattern behind those numbers is consistent: compress the time to the second order, fix early subscription churn, and make every message earn its place. Read the full case studies for the baselines, timeframes and how each result was measured.
★★★★★
"Is this just email?"
"Everboost go beyond email to consider retention improvement across the board. I couldn't recommend them more."
Who we work with
Health and wellness ecommerce brands doing seven to eight figures, in the UK, US and Australia: supplements, skincare, food and drink, personal care and pet health. Brands at that stage have enough customers for retention engineering to compound quickly. Under roughly £2m a year the honest answer is usually that acquisition and offer testing deserve your cash first, and we say so on the intro call.
Where to start
The diagnostic comes first.
It starts with an intro call, a consultative conversation about your brand. If there is a fit, we run a full diagnostic of your retention engine and you get:
- 01
Customer data, read properly
How your customers actually reorder: the gaps, the cohorts, and who is worth keeping, winning back or letting go.
- 02
Every message reviewed
A flow-by-flow and campaign review of everything currently running, and what each piece is doing to revenue.
- 03
Subscriptions and the offer
The programme mechanics and whether customers have a reason to come back that is not a bigger discount.
- 04
The findings, ranked
What each leak is costing you and the first lever to pull. Yours to keep whether we work together or not.
Frequently asked questions
What does a retention marketing agency actually take over?
The whole system that turns first orders into repeat revenue: your customer data and segmentation, the offer and subscription programme, the flow library, the campaign calendar across email and SMS, and the reporting that tells you what is working. You keep acquisition; we make every customer it brings in worth more.
How much does a retention marketing agency cost?
Everboost works on a monthly retainer scoped to your brand after the diagnostic, rather than a fixed menu price, because a subscription-heavy brand with deliverability problems needs different work from a brand chasing its second order. The intro call is where we work out what your engine needs; the diagnostic findings are yours to keep whether we work together or not.
How quickly should we expect results?
Retention compounds rather than spikes. Quick wins usually land in the first month or two, but the real output shows over a quarter and keeps building. Anyone promising a retention transformation in two weeks is selling you a discount code.
Do you replace our in-house team?
No. Most of our clients have a marketing team; we take retention off their plate so they can focus on acquisition, product and brand. The strategist you meet before signing runs your account, ships weekly, and reports in your Slack.
Which channels do you cover?
Email, SMS, direct mail and subscription lifecycle messaging, built on Klaviyo, Loop, Skio, Attentive and Shopify. The channels are the visible layer; the customer data and offer work underneath them is what makes the numbers move.
We're under £2m a year. Is a retention agency worth it?
Probably not yet, and we'd rather tell you than take the retainer. At that stage your cash usually works harder in acquisition and offer testing. Book the call anyway if you're unsure: we've pointed plenty of brands at the right next step and they've come back later.