The Benefits of Working With a Klaviyo Agency (And What to Expect)

Klaviyo is one of the most important tools in the ecommerce retention stack.

It gives you the infrastructure to reach customers through email, SMS and mobile push notifications. You can build automated flows around customer behavior, segment your audience and personalize messages based on everything you know about each customer.

But having Klaviyo and getting the most out of Klaviyo are two very different things.

We’ve seen this play out with a lot of brands we work with on mobile apps. The depths of what a full retention strategy entails is just too much for most brands to run in-house, especially lean brands with team members wearing multiple hats.

So the best way to ensure your Klaviyo flows, segmentation, and everything else isn’t just another checkbox in someone’s day, is to hire an agency that specializes in this kind of thing.

In this guide, we’ll break down why you need an agency, if you actually need an agency, and some recommendations for the best agencies to choose from.

What Does a Klaviyo Agency Do?

A Klaviyo agency helps you build and manage your customer retention program using Klaviyo.

The exact scope varies between agencies. Some focus almost entirely on email creative. Others operate as a complete outsourced retention department, managing your strategy across email, SMS and push notifications.

A full-service Klaviyo agency might handle:

• Klaviyo account audits
• Customer journey and retention strategy
• Automated flow setup
• Campaign planning
• Email and SMS copywriting
• Email design and development
• Audience segmentation
• Personalization
• Deliverability and list hygiene
• List growth
• A/B testing
• Reporting and attribution
• Klaviyo migrations
• Mobile push campaigns and automations
• Integrations with your ecommerce and marketing stack

Klaviyo has thousands of agency, freelancer and systems-integration partners working across ecommerce strategy, marketing automation, design and development.

But partner status alone doesn’t guarantee that an agency will be right for you.

The important question is what the agency will actually own.

You don’t want to hire an agency and still have your internal team responsible for coming up with every campaign idea, writing every brief and identifying every opportunity.

A strong agency should bring a plan.

Klaviyo Strategy and Customer Journey Planning

The agency should begin by understanding how customers move through your business.

That includes what happens before their first purchase, what encourages a second purchase and what causes previously active customers to disappear.

From there, the agency can map out the messages needed at each stage of the journey.

This could include:

• Welcome and lead-nurture flows
• Browse abandonment
• Cart and checkout abandonment
• Post-purchase education
• Cross-sell and upsell messages
• Review requests
• Replenishment reminders
• Subscription messaging
• Loyalty and VIP flows
• Back-in-stock alerts
• Win-back campaigns

This is where the agency should go beyond a standard Klaviyo template.

Your customer journey is specific to your products, buying cycle and business model. Your flows should reflect that.

Campaign and Flow Execution

Strategy doesn’t mean much if nobody has the time to execute it.

Your agency should be able to take a campaign or flow from idea to finished message.

That usually includes:

• Planning
• Copywriting
• Design
• Building the message in Klaviyo
• Adding links and tracking
• Checking mobile layouts
• Testing dynamic content
• Quality assurance
• Scheduling
• Post-campaign analysis

This takes a surprising amount of work.

One promotional email might look simple when it arrives in your inbox. Behind it are product decisions, offers, copy, creative, segmentation, approvals, links, testing and reporting.

Multiply that across several campaigns every week and dozens of automated flows, and you have a full-time function.

Reporting and Optimization

Your agency should also be responsible for improving the program over time.

Flows aren’t set and forget.

Customer behavior changes. Your products change. Your offers change. An automation that performed well a year ago might now contain outdated creative, weak offers or gaps in the customer journey.

A good agency will continually test areas such as:

• Subject lines
• Message timing
• Sending frequency
• Flow length
• Discounts and incentives
• Calls to action
• Email design
• SMS copy
• Segmentation
• Channel order
• Product recommendations

The point isn’t to run tests for the sake of filling a report.

It’s to steadily improve the amount of profitable revenue you generate from the customers and subscribers you already have.

The Benefits of Working With a Klaviyo Agency

Hiring an agency isn’t automatically better than managing Klaviyo internally.

A strong in-house team can produce excellent results. They’ll have deep brand knowledge, quick access to the rest of your company and complete control over the campaign calendar.

But building that team takes time, money, and expertise. Going with an agency can skip the time and expertise part, and take advantage of people who have been through all the learning experiences already.

Here are the main reasons brands choose the agency route.

Get a Complete Retention Team Without Hiring One

Running Klaviyo properly requires several different skills.

You need someone who understands retention strategy and customer behavior. You need a copywriter, a designer and someone who knows how to build everything inside Klaviyo.

You may also need support with deliverability, data, integrations and reporting.

That’s rarely one person.

An agency gives you access to a wider team without requiring you to recruit, train and manage several specialist employees.

Launch More Campaigns and Flows Faster

Most ecommerce teams don’t have a shortage of ideas. Just a shortage of time.

You know you should rebuild your welcome series. You’ve been meaning to launch a win-back flow. Your post-purchase emails could be better. You want to segment VIP customers differently.

But there’s always something more urgent.

The product launch comes first. Then there’s a site update, a sale, an inventory problem or a new acquisition campaign.

Retention work gets pushed down the list.

An agency gives it a dedicated owner, which lets you clear the backlog, produce campaigns more consistently, and make retention a priority again.

Improve the Quality of Your Creative

Your customers receive a lot of marketing messages.

It’s not enough for an email to function correctly. It needs to earn attention, communicate the value of your offer and give the customer a reason to act.

A specialist agency should be better at all of this than someone for whom it’s just one part of their job.

Build More Sophisticated Segments and Automations

Basic Klaviyo campaigns send one message to a large section of your list.

A more mature strategy treats different customers differently. Someone who has bought five times shouldn’t necessarily receive the same message as someone who subscribed yesterday and has never purchased.

Agencies tend to understand segmentation better, from the technical aspects of how to build segments, to the strategic approach behind segmentation.

Protect Your Deliverability

A great campaign is worthless if it lands in spam.

Deliverability becomes more important as your list and sending volume grow. Small mistakes around consent, list hygiene, sender authentication and audience targeting can eventually affect your ability to reach customers.

This is specialist work; and an area where an agency likely knows more about protecting the long-term health of your list and sending infrastructure.

Get More Useful Reporting

Klaviyo gives you a lot of data.

An agency should help you interpret performance and decide what to do next. That means going beyond open rates and screenshots of attributed revenue.

You should understand:

• Which flows are growing
• Which flows are underperforming
• Which campaigns generate profitable sales
• Which customer segments are most valuable
• Where customers leave the journey
• How discounts affect revenue and margin
• Which channels are most cost-effective
• What the agency plans to test next

The reporting should lead to decisions.

A dashboard without analysis doesn’t do much for your business.

Take Pressure Off Your Internal Team

Managing a retention calendar is relentless.

There’s always another campaign to build, another promotion to prepare for and another flow that could be improved.

Even when retention is important, it often ends up being managed by someone who already has several other responsibilities.

An agency gives your internal team more room to focus on the parts of the business only they can own.

Klaviyo Agency vs Managing Klaviyo In-House

There’s no universally correct answer as to whether it’s best to go with an agency or do it yourself.

The best model depends on your size, internal expertise, budget and how important retention is to your business.

In-house usually makes sense when retention is already a large enough part of your business to justify a dedicated person or team.

You get more control and closer collaboration with the rest of the business. But you also carry the hiring risk and management overhead.

An agency is generally a better fit when you want a complete retention program but don’t yet want to build a complete department.

You can also use a hybrid model.

Your internal team can own the overall brand and promotional calendar, while the agency handles strategy, production, implementation and optimization.

The Best Klaviyo Agencies to Choose From

If you're looking for someone to run your Klaviyo strategy, there are a lot of companies to choose from.

We've narrowed it down below to a few of the most highly regarded names in the ecommerce retention marketing space.

1. InboxArmy

InboxArmy stands out as a top U.S. email marketing agency specializing in deliverability, automation, and large-scale campaign management. Based in Grapevine, Texas, and founded in 2016, they’ve managed campaigns for over 5,000 brands across 25+ industries, including ecommerce, SaaS, and healthcare.

Their expertise lies in combining technical precision with creative strategy. InboxArmy conducts domain and IP audits, authenticates senders with SPF, DKIM, and DMARC, and warms IPs for optimal inbox placement. The agency often lifts deliverability above 95%, driving measurable boosts in engagement and sales for clients like Spotify and Airbnb.

Led by CEO Scott Cohen, InboxArmy’s 60+ team handles everything under one roof, strategy, design, development, automation, and compliance. Their Klaviyo Master Silver Partner status reflects deep proficiency across ESPs such as Salesforce, HubSpot, and Marketo.

And if consistency is the name of the game, InboxArmy plays to win. Clients report seamless migrations, increased sender reputation, and stronger ROI within the first quarter of collaboration.

Key Services

• Full deliverability audits, IP/domain warming, and reputation recovery
• ESP migration and platform evaluation for 50+ providers
• Advanced lifecycle automation and email flow setup
• Responsive template design and HTML coding
• SMS and multichannel automation integration
• Campaign management, reporting, and compliance oversight

2. Chronos Agency

Chronos Agency is a top pick, renowned for boosting profits for fast-growing DTC brands using Email, SMS, and Push Marketing. Their expertise and strategic marketing skills have led to revenue increases of 20% to 30% for ecommerce businesses.

With a global team of 80, they act as an extension of your own business, handling everything from copywriting and graphic design to strategy and execution.

Chronos Agency has generated over $181M in returns from email, impressing more than 300 clients with an average ROI of 3500%. They’ve collaborated with big names like The Oodie, Truly, Cise, and Forchics. With Chronos, it’s like having a top-tier marketing department without the hassle of office coffee runs or awkward water cooler chats.

Key Services

• They craft strategies to boost email open rates with engaging subject lines tailored to your audience.
• They streamline customer journeys, engaging your subscribers and boosting conversions.
• Chronos dives into your DTC store’s email marketing systems to identify and fix issues, creating a detailed action plan to accelerate your brand's growth.
• Their advanced customer behavior segmentation targets promotional emails, upsells, cross-sells, and engagement emails for maximum opens, clicks, and sales.
• Through continuous A/B testing, they ensure your emails deliver the highest possible ROI, tweaking everything from design to subject lines and send times to unlock hidden revenue for your store.

3. Aspekt

Working with brands like Mark Ingram and Urban Tots, one of the best standouts in this list is Aspekt, known for their expertise in both social media and email marketing, with Klaviyo as their trusty tool.

They understand that in today's digital world, an omnichannel approach is key, making sure all your marketing channels play nice together. Boasting an impressive track record, including over $10M in average revenue growth and 30M+ total emails sent, they prove that seeing the big picture leads to big results.

So, if you're looking to turn those Instagram likes into email opens and maybe a few cha-chas, Aspekt could be the perfect fit.

Key Services

• They have SMS marketing strategies that build priceless customer relationships, through customized SMS campaign management, so you never have to guess what to send next.
• Aspekt has SMS automation that ensure your subscribers get the right message at the right time!
• Always have your customer base in check with copy and designs that convert highly while staying true to your brand, with subscriber growth strategies to keep your SMS list growing around the clock.
• Continuous optimizations for high click and conversion rates and Constant monitoring and improvement of SMS deliverability to avoid any blacklist surprises.

4. The Email Marketers

Working with brands like Nerd, bud.com, and Cove, The Email Marketers offer a full suite of email marketing services specifically tailored to the Klaviyo platform. This includes everything from strategic campaign planning and eye-catching template design to compelling copywriting, advanced automation setup, in-depth segmentation, and ongoing performance analysis.

Their strength lies in providing end-to-end Klaviyo solutions designed to support ecommerce brands with diverse email marketing needs.

Key Services

• They develop email and SMS strategies that center around each customer’s unique journey. No more generic blasts; expect strategies as personalized as your grandma’s secret recipe.
• Your brand is one-of-a-kind, and so are their creative designs and copywriting. They focus on making your emails not just seen, but clicked, and converted.
• With a focus on spam prevention and deliverability, their email strategies are like the secret sauce to keep your messages in inboxes and out of junk folders.
• If you’re head over heels for email and want more, they optimize your on-site opt-ins and run list-growth campaigns that make your subscriber list grow faster than a viral cat video.
• Forget stressing about next week’s emails and SMS; they’ll map out your entire quarter with detailed campaign management and lifecycle automation, so you can focus on other things, like taking that well-deserved coffee break.

5. Arcady Media

When it comes to Klaviyo agencies, Arcady Media stands out with its impressive roster of over 300 satisfied clients, including well-known names like Hudson’s Bay, Ice Carats, PocketSpeech, and Tanoa. Arcady Media offers a complete email and SMS marketing solution tailored specifically for ecommerce businesses.

Their team of experts ensures that your campaigns are properly personalized, driving both sales and customer engagement. They deliver a full-service approach that replaces the need for multiple employees, all at a fraction of the cost. And who doesn’t love saving money without sacrificing quality?

Key Services

• Seamless migration from any platform to Klaviyo, complete with a comprehensive audit and action plan.
• They have a dedicated team of 6 experts ready to cater to every marketing need.
• Get In-depth competitor data analytics, covering frequency, terms, and send times, so your strategy is always a step ahead.
• With Arcady, get tailored retention strategies, including customer journeys and loyalty programs.
• Stay on top with creative implementation and detailed reporting.
• Robust email and SMS flows, monthly campaigns, and pop-up builds, all optimized for maximum impact.

When Does Hiring a Klaviyo Agency Make Sense?

You don’t need to hire an agency simply because you use Klaviyo.

It makes sense when a lack of time, expertise or ownership is preventing you from getting more from the platform.

Here are some signs you may be ready.

You Only Have a Few Basic Flows

A welcome flow and abandoned cart series are the starting point.

They’re not a complete retention program.

If you haven’t built post-purchase, browse abandonment, win-back, replenishment, loyalty or VIP automations, there may be significant gaps in your customer journey.

Your Campaign Calendar Is Inconsistent

Campaigns shouldn’t go out only when someone remembers to send one.

An agency can give you a consistent calendar built around:

• Product launches
• Seasonal moments
• Promotions
• Inventory
• Customer behavior
• Brand content
• Retention goals

Consistency matters.

You can’t learn what works if your campaigns are sporadic and every send is put together at the last minute.

Your Existing Flows Rarely Get Updated

Your automated flows may generate revenue every day.

But when did you last review them?

Old flows often contain outdated branding, discontinued products, weak segmentation and offers that no longer make sense.

An agency can audit and improve what is already running before building anything new.

Nobody Internally Owns Retention

This may be the clearest sign.

If email and SMS are divided between several people, nobody is truly accountable for the result.

Tasks get completed, but the overall program doesn’t move forward.

An agency gives you an owner, a process and a roadmap.

You Want to Add SMS or Mobile Push

Adding another channel creates more opportunities.

It also creates more complexity.

You need to decide who receives each message, which channel should come first and how to avoid contacting the same customer too often.

An agency with multichannel experience can help you expand without creating a disconnected customer experience.

Deliverability Is Declining

If engagement is falling or more messages are landing in spam, don’t ignore it.

Deliverability problems can get worse over time.

An experienced agency can audit your setup, identify likely issues and build a recovery plan.

You’re Migrating to Klaviyo

A migration involves more than importing a list.

You may need to transfer:

• Subscriber data
• Consent records
• Segments
• Templates
• Flows
• Historical engagement data
• Ecommerce events
• Forms and pop-ups
• Integrations

An agency can help you avoid losing important data or launching with broken automations.

When You Might Not Need an Agency

An agency isn’t always necessary.

You may be better off managing Klaviyo internally when:

• Your list and campaign volume are still very small
• You only need a few simple flows
• You have an experienced retention marketer in-house
• Your internal team has enough design and copy capacity
• You need occasional technical support rather than full management
• Your agency budget would be better spent proving product-market fit or generating initial demand

Don’t outsource a function simply because you assume an agency will fix everything.

The agency still needs clear offers, good products, accurate inventory information and input from your team.

It can improve your retention program. It can’t compensate for fundamental problems elsewhere in the business.

Why Your Klaviyo Agency Should Manage Email, SMS and Push Together

Klaviyo is no longer just an email platform.

It can support campaigns across email, SMS, WhatsApp and mobile push notifications. Klaviyo also lets brands add push notifications directly to automated flows, provided the customer has given the required channel consent.

That changes what you should expect from a Klaviyo agency.

Your customers don’t experience your email strategy, SMS strategy and push strategy as separate departments. They experience messages from your brand.

Those messages need to work together.

Email

Email gives you room to communicate.

You can use it for:

• Product launches
• Educational content
• Brand storytelling
• Detailed offers
• Product recommendations
• Post-purchase information
• Longer automated sequences

It’s flexible, relatively inexpensive and available to almost every brand.

But inboxes are crowded. Even engaged subscribers won’t see every email you send.

SMS

SMS is direct and immediate.

It works particularly well for urgent messages such as:

• Limited-time promotions
• Back-in-stock alerts
• Delivery updates
• Event reminders
• High-intent cart recovery

But SMS has a direct sending cost. Customers also tend to have a lower tolerance for irrelevant or excessive text messages.

You need to use it selectively.

Mobile Push Notifications

Mobile push gives you a direct line to customers who have installed your app and opted in to notifications.

You can use push for:

• Product drops
• Flash sales
• Restocks
• Abandoned cart reminders
• Loyalty rewards
• App-exclusive offers
• Replenishment reminders
• New content

Push is especially valuable because messages can be incorporated into the same Klaviyo flows used for email and SMS.

There’s no reason for your app notifications to operate as a completely separate marketing program.

Why These Channels Need to Work Together

The goal isn’t to send the same promotion through every channel.

That’s a fast way to annoy your customers.

The goal is to choose the best channel for each person and each moment.

Take an abandoned cart flow.

You might:

1. Send a push notification to app users shortly after they leave
2. Follow up later with an email containing more product detail
3. Reserve SMS for high-value carts or customers who have shown strong purchase intent

Or consider a back-in-stock flow.

Push and SMS can create an immediate response. Email can provide more space for product details, recommendations and supporting content.

Klaviyo supports email, SMS and push within the same customer communication strategy, making it possible to coordinate channel timing rather than running three disconnected programs.

A good agency should understand these tradeoffs.

It shouldn’t simply send more messages because more channels are available.

Bringing Mobile Push Into Your Klaviyo Retention Strategy

Email and SMS are powerful channels.

But they both have limitations.

Email competes with a crowded inbox. SMS has a direct sending cost and should generally be used selectively.

Mobile push gives you another way to reach your highest-intent customers.

The catch is that customers need to install your mobile app before you can send them native push notifications.

That’s where MobiLoud fits in.

MobiLoud turns your existing ecommerce website into native iOS and Android apps. Your website is the foundation of your app, which means you don’t need to recreate your entire store and feature set in a separate app builder.

MobiLoud apps integrate with Klaviyo for mobile push, allowing your team or agency to manage app notifications alongside email and SMS.

This means your agency can:

• Add push notifications to existing Klaviyo flows
• Segment app users
• Trigger notifications based on customer behavior
• Send campaigns for launches, promotions and restocks
• Direct customers to relevant screens inside the app
• Coordinate push with email and SMS
• Track app engagement as part of the wider retention strategy

You don’t need another disconnected platform or a separate team managing your app channel.

Your Klaviyo agency can continue working inside the system it already understands.

That turns your app into a natural extension of your retention program.

Final Takeaways

Klaviyo gives you the tools to build a powerful retention program.

But the tools don’t create the strategy, write the campaigns, build the flows or improve performance on their own.

That requires time and specialist expertise.

A Klaviyo agency can give you a complete retention team without the cost and complexity of hiring every role internally. The right partner will help you move faster, improve your creative, build more sophisticated automations and create a consistent program across email, SMS and mobile push.

The key is to hire an agency that takes ownership.

You don’t just need someone who knows where the buttons are in Klaviyo. You need a partner that understands your customers, your economics and how retention contributes to the wider business.

Get that right, and your owned channels can become a reliable source of repeat revenue while your internal team stays focused on everything else.