Customer Growth & Retention
A Customer Retention Marketing Agency That Grows What You Already Have
OnlyConversion is a customer retention marketing agency running email marketing, lifecycle automation, CRM programmes and online reputation management. We build the flows that turn one-time buyers into repeat customers on platforms including Klaviyo, HubSpot, Braze, Zoho and Mailchimp, and we measure the work in repeat purchase rate and customer lifetime value.
We'll show you what your current repeat rate is worth, and what a realistic improvement would add.
Illustrative of the pattern we see most often, not a specific account.
Who this is for
Who we work best with
This is built for you if
- You sell something people can buy more than once, and most of them currently do not. That gap is the cheapest revenue available to you.
- You have a database you are not really using. A list of past customers sitting in a platform, receiving an occasional broadcast and nothing else.
- Your acquisition costs have climbed to the point where the first order barely breaks even, which makes the second order the entire business case.
- You are a service business whose reviews do not reflect the quality of your work, because happy customers say nothing and unhappy ones are motivated.
You might be better served elsewhere if
- You genuinely sell a once-in-a-lifetime purchase with no referral or renewal dimension. Retention economics do not apply, so your budget goes further on acquisition and on reviews, and we would rather point you at those than sell you flows you cannot use.
- You have very few customers so far. Lifecycle programmes need volume to learn from, so acquisition usually comes first and we are happy to start there.
- You want a one-off campaign rather than an ongoing programme. Retention compounds across cycles, so a single send would not show you what this can do. A freelance email specialist will build you a one-off campaign for less than we would, and that is a sensible way to test the idea before committing to a programme.
- Your product has a fundamental repeat problem. If people do not come back because the experience disappointed them, email will make that more visible rather than fix it, and we will say so during the audit.
The problem
The cheapest customer you will ever get is the one you already have
Retention failure is silent. That is why it survives budget reviews.
Almost every marketing budget is built around acquisition. New campaigns, new creative, new audiences, new channels. Meanwhile the list of people who have already bought, already trusted you and already handed over their details receives a newsletter when someone remembers.
That imbalance made sense when acquisition was cheap. It has become steadily harder to defend as costs have risen, because the margin on a repeat purchase is dramatically better than on a first one. There is no ad spend attached, no discount needed to overcome unfamiliarity, and no trust to establish.
The awkward arithmetic is that a small improvement in repeat rate is usually worth more than a large improvement in acquisition, and costs a fraction as much to achieve. A brand converting fifteen per cent of customers into second purchases instead of ten has grown revenue meaningfully without spending anything more on ads.
The reason it gets neglected is that it is invisible. Nobody notices the customer who quietly did not come back. Acquisition failure shows up in a dashboard the same week, whereas retention failure shows up as a number that was always slightly lower than it should have been.
A repeat purchase carries no acquisition cost.
Which is why the margin on it is usually far better than on the order that won the customer in the first place.
Nobody notices the customer who quietly did not return.
Retention failure is silent, which is exactly why it survives budget reviews that cut visibly underperforming channels.
So we start by measuring what your current repeat behaviour is actually worth, then build the programme that moves it.
Work it out
What is your repeat rate worth?
Enter three numbers you already know. The output is what a realistic improvement in repeat purchase rate would add to annual revenue, without any increase in ad spend.
- Annual revenue from repeat purchases now
- $73,440
- After the improvement
- $114,240
- Additional annual revenue
- $40,800
With no increase in acquisition spend.
This is a directional estimate to show the order of magnitude. Your actual numbers depend on category, margin and purchase cycle, which is what the audit establishes.
How this is calculated
- Repeat revenue is estimated as new customers per year, multiplied by the repeat rate, multiplied by average order value.
- It assumes one additional purchase per retained customer, which is deliberately conservative. Real lifecycle programmes usually produce more than one.
- It ignores margin, discounting and returns, so treat the output as an indication of scale rather than a forecast.
- The improvement figure is a change in percentage points, not a relative increase. A rate of 18% improved by 10 points becomes 28%, not 19.8%.
- The improved rate is capped at 100%, because under the assumption above a repeat rate above 100% would mean more repeat purchases than customers.
- Because it counts percentage points, the additional revenue figure does not change with your current repeat rate until the 100% cap binds. Moving from 70% to 80% is much harder than moving from 10% to 20%, and the calculator does not attempt to price that difficulty.
- New customers are counted as a full year at the rate you enter. Customers acquired late in the year have had less time to return, so a single year is a slightly optimistic window for them and a conservative one for the cohort overall.
Lifecycle
The lifecycle marketing flows we build
These are the automated programmes that do the work continuously, rather than campaigns that go out when someone has time. Most brands have one or two of these. Very few have all of them running properly.
- 01
Welcome
Someone joins the list
Introduces the brand, sets expectations and earns the first purchase. Usually the highest-revenue flow in the account.
Highest revenue per recipient
- 02
Browse abandonment
Viewed, did not add to basket
Catches interest before it cools, without the heavy-handed discounting that trains people to wait.
Cheapest incremental revenue
- 03
Cart abandonment
Added to basket, did not buy
The best-known flow and frequently the worst executed. Timing and sequence matter more than the offer.
Highest conversion rate
- 04
Post-purchase
Order placed
Reduces buyer regret, sets delivery expectations and asks for the review at the moment satisfaction peaks.
Drives reviews and referrals
- 05
Replenishment
Consumption cycle ends
Timed to when the product actually runs out. For consumables this single flow often carries the whole programme.
Best repeat-rate lever
- 06
Winback
Lapsed beyond normal cycle
Reaches people before they have fully forgotten you, which is a much shorter window than most brands assume.
Recovers dormant revenue
- 07
Sunset
No engagement over a long period
Removes people who will never return. Protects deliverability, which protects every other flow on this list.
Protects inbox placement
Each flow is built, tested and then left to run. That is the reason retention compounds: the work you did in month one is still producing revenue in month twelve without anyone touching it.
Reputation
Online reputation management services
Reviews are retention work that happens in public. They influence acquisition, they surface in AI answers about your brand, and for service businesses they are frequently the deciding factor before anyone makes contact.
Review generation
- Asked at the point of peak satisfaction, which is usually just after delivery or completion rather than weeks later
- Routed to the platform that matters for your category, whether that is Google, Trustpilot, an app store or an industry directory
- Made genuinely easy: one tap, pre-authenticated where the platform allows it
- Never incentivised, because incentivised reviews violate most platform policies and are detectable by the people you are trying to persuade
Response standards
- Positive reviews
- Answered within 2 working days
- Negative reviews
- Answered within 1 working day
- Anything alleging harm or legal risk
- Escalated to you within 1 hour
- Coverage
- Every working day, on your primary market hours
What our review management covers
- Google Business Profile and Google reviews
- Trustpilot and category-relevant review platforms
- App store reviews where applicable
- Social mentions and tags of the brand
- Branded search results, so you know what a prospect sees when they look you up
The one rule we do not bend
We do not write fake reviews, buy them, or work alongside anyone who does. Beyond being against every platform policy, it corrupts the only honest feedback signal your business has, and it is far more detectable than the people selling it admit.
Platforms
The email marketing and CRM platforms we work in
We work in the platform you already have wherever that is sensible, because migrating is expensive and rarely the actual problem.
- Ecommerce lifecycle
- KlaviyoMailchimpOmnisend
- CRM and B2B lifecycle
- HubSpotZohoSalesforce
- Cross-channel messaging
- BrazeCustomer.io
- Reviews and reputation
- Google Business ProfileTrustpilotJudge.me
- Measurement
- Google Analytics 4Shopify analyticsLooker Studio
You own the account, the list, the flows and the templates. If we stop working together, the programme keeps running and you keep the revenue it produces.
Measurement
How we measure retention
Email programmes are usually reported on open rate, which has been unreliable since privacy features began pre-loading images. These are the numbers that actually indicate whether retention is improving.
Programme metrics
Whether the flows are working
- Revenue per recipient, which is the honest measure of an email programme
- Repeat purchase rate, tracked as a trend rather than a snapshot
- Flow revenue as a share of total, which should grow as automation matures
- Deliverability and inbox placement, because everything else depends on it
Business metrics
Whether it moved the company
- Customer lifetime value, segmented by acquisition channel
- Time between first and second purchase, which should shorten
- Share of revenue from returning customers
- Review volume and average rating over time
The metric we report on hardest
Repeat purchase rate. It is slow, it moves in small increments, and it cannot be flattered by sending more email. Open rate can be improved by changing a subject line. Repeat rate only improves if customers genuinely come back, which is why it is the number we agree at the start.
When email is not the answer
If people are not returning because the product or the delivery experience disappointed them, a lifecycle programme will surface that faster rather than fix it. The audit looks at repeat behaviour before it looks at your email account, and if the problem sits upstream we will tell you plainly.
Engagements
Ways to work with us
Three shapes, depending on what already exists. All three are lifecycle marketing agency work rather than campaign send-outs, because the revenue is in the automation.
Retention audit
What your current repeat rate is worth, which flows are missing, what your deliverability looks like, and where the recoverable revenue sits. Yours to keep and implement with anyone.
Start here if unsure
Build and hand over
We build the lifecycle programme, test it, document it and hand it to your team to run. Suited to businesses with in-house marketing capacity.
You have a team to run it
Managed programme
We run the whole thing: flows, campaigns, segmentation, reviews and reporting, improving it continuously. The arrangement that compounds fastest.
Recommended for ecommerce
What determines scope
- How many flows are needed, and how many already exist in usable condition
- Catalogue size and complexity, which drives how much segmentation is worth building
- Whether reputation management is included
- How many markets and languages the programme covers
- The state of your list and deliverability, which sometimes needs repair before anything is sent
- Whether creative is produced by us or supplied by you
We do not publish rates. A single welcome flow and a full multi-market lifecycle programme with reputation management are both "retention" and differ enormously. You will have an accurate number after the audit.
Why OnlyConversion
Why work with us
01We run acquisition too, so we can see the whole economics
Knowing what a customer costs to acquire is what makes retention decisions rational. An email marketing agency working alone is optimising one half of an equation it cannot see, because it never learns what the first order cost you.
02We report repeat rate, not open rate
Open rate has been unreliable for years and it is still the headline number on most retention reports, because it moves easily. We agree the real measure before we build anything.
03The programme keeps working if you leave
You own the account, the flows and the templates, and they are documented so your team can run them. A customer retention agency should not be a subscription you pay to keep your own revenue.
FAQ
Frequently asked questions
What this is
Scope and platforms
What does a customer retention marketing agency do?
We build and run the programmes that turn one-time buyers into repeat customers: email marketing, lifecycle marketing automation, CRM marketing services and online reputation management services. In practice that means welcome, abandonment, post-purchase, replenishment and win-back flows, plus the measurement that shows whether repeat purchase rate and customer lifetime value are genuinely improving. It is the same discipline a loyalty programme aims at, built with automation rather than points.
Do you work with Klaviyo?
Yes. Most of our ecommerce lifecycle work is Klaviyo agency work, and it is the platform we use most. We also work in HubSpot and Zoho for B2B and CRM-led programmes, Braze and Customer.io for cross-channel messaging, and Mailchimp and Omnisend where they are already in place. We would rather work in the platform you have than migrate you without a good reason.
Is email marketing still effective?
It remains the highest-margin channel most businesses have, because there is no media cost attached and the audience has already chosen to hear from you. What has changed is that open rate is no longer a reliable metric, so email marketing services need to be judged on revenue per recipient and repeat rate instead. Most of the revenue comes from email automation running continuously rather than from broadcasts.
What it returns
Scale and timing
How much can retention realistically improve revenue?
It depends on your starting repeat rate and your purchase cycle, which is exactly what the calculator on this page is for. As a rule, brands with high churn and a consumable or replenishable product have the most available, because a replenishment flow alone can move the number. The audit gives you a specific answer for your business.
How long before retention work shows results?
Flow revenue usually appears within the first weeks, because welcome and abandonment flows start working as soon as they are live. Repeat purchase rate takes longer, because it can only move as fast as your purchase cycle allows. A brand with a six-month replenishment cycle will see the real number move later than one selling monthly consumables.
We already send emails. Is that enough?
Broadcast campaigns and lifecycle automation do different jobs. Campaigns reach everyone at a moment of your choosing. Flows reach one person at the moment of their choosing, which is why they consistently earn far more revenue per recipient. Most businesses we audit are doing the first well and the second barely at all.
Reviews and ownership
Reputation, and what you keep
Do you handle negative reviews?
Yes. Routine criticism is answered within one working day, in your voice and with your approval on the approach. Anything alleging harm, or carrying legal or regulatory risk, is escalated to your team within the hour rather than answered by us, because an agency should not be improvising on your behalf when something serious has happened.
Can you generate more reviews for us?
Yes, by asking at the point of peak satisfaction, routing to the platform that matters for your category, and making it genuinely quick. What we will not do is incentivise or fabricate reviews. Both breach platform policy, both are more detectable than vendors admit, and both destroy the credibility of every honest review you have.
Who owns the email list and the flows?
You do, entirely. The platform account is in your name, the list is yours, and the flows and templates stay in your account fully documented. If we stop working together the programme keeps running and keeps producing revenue.
Next step
Find out what your repeat rate is worth
We'll look at your repeat purchase behaviour, the flows you have and the ones you don't, and your deliverability. Then we'll tell you what a realistic improvement would add, and what it would take to get there.
Free. No obligation.
Tell us what you’re trying to fix
Service interest is pre-set to Customer Growth & Retention.