Short answer: the best retention marketing agencies for ecommerce in 2026 are Retention Control, Sticky Digital, Propel, Flowium, Andzen, Tinuiti, BMO Media and Stimulate Agency, each described below from its own website. Retention Control, which wrote this guide, publishes two retainers at $3,500 and $5,500 a month; Stimulate Agency is the only other agency on this list that publishes a price.
Rising ad costs have made one thing obvious: the best retention marketing agencies for eCommerce are no longer a “nice to have,” they’re the difference between a brand that scales and one that keeps refilling a leaky bucket. If you’re a Shopify or DTC founder comparing agencies right now, this guide breaks down the top retention-focused teams in 2026, what each one actually specializes in, and how to pick the right partner for your revenue stage.
This list covers full-stack retention specialists, Klaviyo-native agencies, loyalty-program builders, and omnichannel teams, so you can match the agency to your brand’s actual bottleneck instead of hiring based on a logo wall. If you want a free look at where your own store is leaking revenue before you hire anyone, Retention Control’s free 60-minute audit is a useful starting benchmark either way.
Why Retention Marketing Matters More Than Ever in 2026
Acquisition costs keep climbing, iOS privacy changes have made paid retargeting less reliable, and organic reach on social keeps shrinking. Meanwhile, the math on retention hasn’t changed; it has just become more urgent.
- Retaining a customer costs roughly 5x less than acquiring a new one, according to Harvard Business Review research on customer retention.
- Repeat customers spend significantly more per order than first-time buyers.
- A 5% increase in retention can lift profit by 25–95%, per widely-cited Bain & Company research on customer loyalty.
- Brands with mature lifecycle programs typically see email and SMS contribute 30–40% of total store revenue.
Despite this, most eCommerce brands still put 80% or more of their budget into acquisition. That imbalance is exactly why dedicated retention agencies exist: generalist marketing shops treat email and SMS as one channel among many, while a retention specialist treats it as the core growth engine.
What Does a Retention Marketing Agency Actually Do?
A retention marketing agency designs and runs the systems that turn first-time buyers into repeat customers, across the whole of retention marketing rather than one channel. A good retention partner isn’t just “the email people.” Typical scope includes:
- Welcome series — turning a new subscriber into a first-time buyer
- Cart and browse abandonment flows — recovering high-intent visitors who didn’t convert
- Post-purchase sequences — reducing anxiety, driving reviews, and setting up the second order
- Win-back and re-engagement campaigns — reactivating lapsed customers before they churn for good
- VIP and loyalty programs — rewarding top spenders so they stick around and refer others
- Replenishment flows — timed nudges based on actual reorder cycles, common in beauty, pet, and consumables
- SMS strategy — used surgically for time-sensitive moments, not as a spam channel
- Segmentation and reporting — behavior-based lists (not just “everyone who ever bought”) and monthly performance reviews tied to revenue, not just open rates
How We Evaluated These Agencies
To keep this list useful rather than a popularity contest, each agency below was compared against the same criteria:
- Platform certification — verified partner status with Klaviyo, Omnisend, Brevo, or Attentive
- Ownership model — does the agency build strategy and copy, or just the technical flow setup?
- Contract flexibility — lock-in length and whether pricing scales with brand size
- Reporting transparency — whether performance is tied to revenue and repeat purchase rate, not vanity metrics
- Track record — published results, client reviews or partner awards that can be checked
Disclosure: this list is published by Retention Control, which ranks itself first. The other seven are independent agencies with no arrangement with us, described from their own websites.
Comparison Table: Top Retention Marketing Agencies for eCommerce (2026)
| Agency | Best For | Core Specialty | Platforms | Pricing |
|---|---|---|---|---|
| Retention Control | Shopify and DTC brands, $500K+ | Email and SMS flows, campaigns, lifecycle strategy | Klaviyo, Omnisend, Brevo, Attentive | Published: $3,500 or $5,500/month; month to month after 90 days |
| Sticky Digital | Full-service email and SMS | Email and SMS programmes, Klaviyo migrations | Klaviyo | Not published; free retention audit |
| Propel | Health, wellness and telehealth brands | AI-native lifecycle email, SMS and push | Customer.io, Braze, Klaviyo | No figure on its pricing page (checked 8 Oct 2026); 30-day money-back guarantee |
| Flowium | Email-first lifecycle and platform moves | Lifecycle systems, A/B testing, segmentation | Klaviyo | Not published; two-year price lock |
| Andzen | Audit-first optimisation, APAC | Klaviyo programme audits and optimisation | Klaviyo, Shopify Plus | Not published; audit and proposal first |
| Tinuiti | Large brands pairing retention with paid media | Full-funnel media with a CRM and email practice | Amazon, Meta, email | Enterprise; not published |
| BMO Media | Loyalty- and subscription-led DTC brands | Email, SMS, loyalty, reviews, push, subscriptions | Works across platforms | Not published; complimentary audit |
| Stimulate Agency | Email and SMS with subscriptions and direct mail | Klaviyo email and SMS, direct mail, loyalty, upsells | Klaviyo | Published: typically $3,500–$6,500/month; free retention audit |
Each agency is described from its own website, checked in September 2026. Pricing is only listed where the agency publishes it.
The Best Retention Marketing Agencies for eCommerce in 2026
1. Retention Control — Best for Shopify and DTC Brands Doing $500K+
Retention Control is a retention-only agency for Shopify and DTC brands, working on Klaviyo, Omnisend, Brevo and Attentive. Retention is the whole offer rather than an add-on: flow builds, campaign copy and design, segmentation and monthly reporting sit in one retainer, with no separate line item for strategy.
Pricing is published in two tiers: $3,500 a month for DTC and Shopify brands doing $500K–$2M a year (full flow stack, monthly campaigns and reporting), and $5,500 a month for brands past $2M, which adds SMS, structured A/B testing and quarterly lifecycle deep-dives. The first 90 days are the build; after that it is month to month. Every engagement starts with a free 60-minute audit of your account, written up the same day.
The approach leans on behavioural timing: replenishment flows built on a brand’s actual reorder data rather than generic 30/60/90-day templates, and win-back that starts when a customer’s buying pattern breaks instead of discounts on a fixed schedule. Most client results sit under NDA, so the site shows the work rather than named numbers; the free ROI calculator sizes your own upside before a call.
Best for:
DTC and Shopify brands that want one dedicated contact, a published price, and a team that owns both strategy and execution without a long contract.
2. Sticky Digital — Best for Full-Service Email and SMS on Klaviyo
Sticky Digital describes itself as a full-service retention marketing agency that running email and SMS for ecommerce brands, and says it was voted the #1 retention marketing agency in North America. It offers complimentary Klaviyo migrations and a free retention audit.
Best for: Brands that want email and SMS run end to end on Klaviyo, including the move onto the platform.
3. Propel — Best for Health, Wellness and Telehealth Brands
Propel positions itself as an AI-native lifecycle agency for health and wellness brands, running lifecycle email, SMS and push for telehealth, DTC prescription and supplement brands. It says it has worked with 50+ digital health and wellness brands, lists itself as a Customer.io Platinum Partner and a Braze partner and also works on Klaviyo, and offers no long-term contract and a 30-day money-back guarantee. Its pricing page no longer shows a monthly figure (checked 8 October 2026).
Best for: Telehealth, DTC prescription and supplement brands where the next refill is the retention event.
4. Flowium — Best for Email-First Lifecycle Programmes and Platform Moves
Flowium is a retention marketing agency that builds email-first lifecycle systems for ecommerce brands across email and SMS, with A/B testing and segment refinement as part of the service. It starts with a free lifecycle diagnosis and offers a two-year price lock, and client reviews on its site describe migrations to Klaviyo from Mailchimp and Listrak.
Best for: Brands that want an email-led programme with predictable pricing, or that need to move onto Klaviyo first.
5. Andzen — Best for Audit-First Klaviyo Optimisation
Andzen is a Klaviyo Elite Master Partner and Shopify Plus partner that begins every engagement with an audit and a no-obligation proposal, which suits programmes that already exist but underperform. Its site says Klaviyo named it Agency Partner of the Year for APAC in 2025 and again in 2026.
Best for: Established brands, especially in APAC, that need an existing Klaviyo programme tuned rather than rebuilt.
6. Tinuiti — Best If Retention Must Sit Inside a Large Media Programme
Tinuiti is not a retention specialist: it is a full-funnel media agency best known for Amazon and Meta, and runs a CRM and email practice alongside its media teams. For brands whose retention has to be planned together with a large paid-media budget, one agency across both can make sense.
Best for: Larger brands that want retention and paid media planned by the same agency.
7. BMO Media — Best for Loyalty, Reviews and Subscriptions Run as One Programme
BMO Media describes itself as a full-stack retention marketing agency for DTC brands, running email, SMS, loyalty, reviews, push notifications and subscriptions as one programme. It launches and repairs subscription programmes (reducing involuntary churn, smoothing the first 90 days, getting subscribers past the third order), works across platforms rather than on one, and starts with a complimentary audit.
Best for: DTC brands whose retention depends on loyalty and subscriptions as much as on flows.
8. Stimulate Agency — Best for Klaviyo Email and SMS With Subscriptions and Direct Mail
Stimulate Agency is a customer retention agency for DTC brands built around Klaviyo email and SMS, with direct mail, subscription management, loyalty programmes and pre- and post-purchase upsells alongside. It publishes its pricing, typically $3,500 to $6,500 a month, and opens with a free retention audit, which it values at $5,000.
Best for: DTC brands that want email and SMS plus the programmes around them, such as subscriptions and direct mail, from one team.
Agency Guides by Industry and Platform
If your brand sits in a specific category or runs on a specific platform, these guides compare agencies on the work they publish for brands like yours, with the same rule: every fact comes from the agency’s own website.
- Best retention marketing agencies for food & beverage brands: nine agencies with named food, coffee, snack and drinks clients on their own sites.
- Best loyalty and LTV agencies for ecommerce brands: agencies that build loyalty programmes and lifetime-value strategy, compared on their own case studies.
- Best Omnisend agencies for ecommerce brands: nine agencies checked against their own Omnisend pages and Omnisend’s partner directory.
- Best Klaviyo agencies for Shopify brands: eleven agencies with their tier checked in Klaviyo’s own partner directory.
How to Choose the Right Retention Marketing Agency for Your Brand
There’s no single “best” customer retention marketing partner. The right fit depends on where your brand actually is right now. If you are not yet sure a retention agency is the right kind of help, our guide to what kind of agency to hire to improve customer retention matches eight agency types to the problem each one fixes.
- Check your revenue stage.
Retention Control publishes tiers built around $500K–$2M and $2M+ brands; Stimulate also publishes prices; most others quote after an audit. Our guide to affordable retention marketing agencies compares eleven agencies that publish what they charge. Full-funnel media agencies like Tinuiti make more sense once retention has to be planned alongside a large paid-media budget. - Match the model to your product.
Subscription and replenishable products (beauty, pet, supplements) benefit most from agencies that build around reorder cadence and subscriptions, such as BMO Media, or Propel for health and wellness refills. Gifting or occasion-based brands need lifecycle segments built around events, not habits. - Decide if you need a rebuild or an audit.
If flows are already live but underperforming, an audit-first agency is more cost-effective than a full rebuild. Andzen starts every engagement with one, and Retention Control, Flowium, BMO Media, Stimulate and Sticky Digital all offer a free audit. - Confirm platform fit.
Most Shopify DTC brands run on Klaviyo, so check the agency’s tier in the platform’s own partner directory rather than relying on a badge or “experience with” a platform. - Ask what’s actually included.
Some agencies charge separately for strategy, copywriting, and technical builds. Others, like Retention Control, bundle strategy and copy into the base retainer — worth clarifying before you sign anything. - Look for contract flexibility.
A 3-month minimum with month-to-month after is a healthier signal than a 12-month lock-in, especially if you’re testing an agency for the first time.
In-House vs. Generalist Agency vs. Retention Specialist
Before comparing individual agencies, it’s worth understanding the three paths brands usually consider, because the “best” retention agency only matters if you’ve already ruled out the alternatives.
| Option | Pros | Cons |
|---|---|---|
| In-house hire | Full control, dedicated to your brand only | Salary + benefits before seeing ROI, single point of failure, slow ramp-up |
| Generalist marketing agency | One vendor for paid, SEO, and email | Retention is one of many competing priorities; often rotating account teams |
| Retention specialist | Deep platform expertise, retention-specific reporting, faster time to results | Doesn’t cover paid acquisition or SEO — needs to sit alongside those efforts |
Hiring internally means committing to a salary and onboarding time before any flow has even launched. Generalist agencies can be efficient for brands that want one vendor, but retention usually becomes just one of several competing priorities on their plate. A specialist agency trades that breadth for depth — which is exactly why most of the agencies on this list, including Retention Control, position themselves as retention-only rather than full-service.
Red Flags to Watch For When Hiring a Retention Agency
Not every agency claiming “retention expertise” backs it up with a real system. A few warning signs worth checking before signing a retainer:
- No mention of repeat purchase rate or LTV in their reporting.
If an agency only talks about open rates and click rates, they’re measuring engagement, not retention. - Heavy reliance on discounting.
Win-back flows and campaigns that lean on blanket discounts instead of segmentation usually erode margin instead of protecting it. - Long lock-in contracts.
A 12-month minimum before you’ve seen a single flow live is a sign the agency is optimizing for their own cash flow, not your results. - Nothing you can check.
Claims like “we’ve helped hundreds of brands” with no named client, independent review or specific metric are hard to verify. Many retention agencies work under NDA, so ask to see anonymised results and the monthly report itself. - Copy and strategy billed separately from the technical build.
This often means the “strategy” is a template, and the actual thinking happens elsewhere (or not at all).
Final Thoughts
The eCommerce brands winning in 2026 aren’t necessarily spending more on ads; they’re keeping more of the customers they already paid to acquire. Whether that means a full Klaviyo rebuild, a loyalty program, or a targeted audit of flows that already exist, matching your brand’s stage to the right retention partner matters more than picking the biggest name on the list.
If you’re a Shopify or DTC brand doing $500K–$2M+ in revenue and want one retention team that owns strategy, copy, and execution under one retainer, check your numbers with Retention Control’s ROI calculator or book a free 60-minute audit to see exactly where your current retention setup is leaking revenue