Most brands “have Klaviyo.” Very few have a lifecycle system. We build and operate Klaviyo as the engine of retention, expansion, and long-term revenue growth for serious DTC and subscription brands.
The Only Email Team Behind Multiple INC #1 Fastest Growing Brands From Scratch
Trusted by category-defining brands
Flows exist. But they’re outdated, under-tested, or sequenced incorrectly.
Campaigns go out. But they’re repetitive, predictable, and easy to ignore.
Metrics look fine. Revenue plateaus anyway.
Klaviyo is powerful. Most teams are barely using it.
This is not a tooling issue. It is a lifecycle strategy issue.
That is how we treat it.
We start with customer truth, not assumptions. Reviews, surveys, on-site behavior, historical campaigns, and lifecycle data inform everything that follows.
We optimize for business impact. Retention, LTV expansion, reorder rates, and revenue increases. Not vanity dashboards.
We build systems, not templates. From welcome to post-purchase to re-engagement, every flow has a job and a measurable outcome.
Designed emails when they matter. Plain-text when they perform. We avoid banner blindness by mixing formats, voices, and intent.
Strategy, copy, design, dev, QA, PMs. No generalists doing everything “fine.”
Lifecycle innovations others copied. Including in-cycle upselling for subscriptions.
Designed campaigns and plain-text sends that actually get read.
Not short-term spikes.
An average email client relationship of over 4 years.
We operate as an extension of your team, not a vendor.
At Sweat Pants Agency, we’re the only agency behind two INC #1 fastest-growing companies from scratch. Our custom marketing solutions consistently deliver measurable, exceptional results.
After working with Sweat Pants Agency during their initial growth phase, Kitty Poo Club hired a new CMO who decided to try other agencies. Unfortunately, after three agencies, they were unable to replicate the success they had with us.
We overhauled their campaigns by launching scripted UGC, consolidation campaign structures, assisted with AB testing on their landing pages and came up with a more structured creative testing method for them.
SubSummit had worked with multiple agencies but struggled with poor creative, tracking issues, and ineffective targeting.
We deployed a multi-channel strategy across Meta, Google, and LinkedIn Ads. By leveraging custom audiences and third-party data, we improved targeting precision.
SMB Deal Hunter, a newsletter that shares top business deals and educates readers on buying, financing, and acquiring businesses, wanted to: 1) increase sign-ups from accredited investors and 2) drive more interest in their one-on-one services.
To attract more accredited investors, we updated tracking to optimize for accredited sign-ups and refined the creative & landing pages to speak to this audience. For the one-on-one services, we split the funnel to promote scheduled calls directly to qualified leads.
Implant Ninja provided online continuing education for dentists but faced declining results due to ripped content and inefficient strategies.
We reoriented their strategy by selling books upfront ($150–$250/book) as an entry point and upselling courses on the backend while running occasional course sales.
Achieved over a 500% initial ROAS selling books upfront, driving record revenue growth for the business.
A Fortune 50 company needed to scale app downloads as quickly as possible while maintaining efficiency across multiple advertising channels.
We leveraged Meta Ads, TikTok, App Samurai, and TapJoy to create a multi-channel strategy focused on driving installs at scale while staying under budget.
Delivered over 2.2 million app downloads in one year, coming in at 42% under budget.
SnapCare wanted to acquire nurses with specific specialties in Atlanta while building awareness of their app from scratch.
We developed UGC-style creative assets alongside custom landing pages with email follow-ups and deployed targeted Meta Advertising campaigns.
Acquired over 300k nurses, grew a Facebook group of over 50k nurses, and deployed over 4k nurses simultaneously, helping SnapCare grow into the INC #1 fastest-growing healthcare company.
TheGuarantors needed to scale lead generation efforts while improving lead quality for their B2B services.
We synced HubSpot events with ad platforms for better tracking and leveraged LinkedIn Document Ads and precise audience segmentation to target decision-makers effectively.
Reduced cost per qualified lead by over 87%, driving the highest volume of leads ever achieved for the brand.
NokBox approached us in July 2023 with $3.6M in revenue but wanted to accelerate growth while lowering CAC.
We optimized Meta and Google Ads campaigns while enhancing creative assets and email marketing strategy.
The CEO of Mountain Gazette wanted to prove that print media could thrive as a DTC channel after purchasing the magazine in 2022.
We developed a high-converting listicle landing page and optimized campaigns for first-order profitability using Meta and Google Ads.
Acquired over 64k customers, with 32k active paying subscribers, proving print can succeed in DTC.
Schoolyard Snacks (formerly The Cereal School) needed to scale revenue while regaining efficiency in their campaigns.
We focused on improving ROAS through creative testing and campaign optimization on Meta and Google Ads.
Hunt A Killer was a brand-new concept in 2015 with zero customers. They needed to scale quickly while maintaining profitability.
We scaled them to 8-figures in their first 13 months. After trying another agency, they returned to us to double their business in 90 days. We achieved this in just 34 days by reducing CAC and optimizing campaigns across platforms.
AppyHour approached us in January 2023 after working with another agency that failed to achieve a sustainable CAC.
Within weeks, we optimized their campaigns, focusing on creative testing and refining targeting across Meta and Google Ads.
At Sweat Pants Agency, we don’t just hit targets—we raise the bar. With data-driven email and SMS strategies, we consistently deliver measurable success that’s tailored to your brand’s growth.
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Our team of experts live, breathe, and geek out on Meta so you do not have to.
Klaviyo is our primary ESP expertise because it’s the most powerful platform for DTC and eCommerce brands. That said, we can work with other ESPs (Mailchimp, Attentive, Postscript) if needed. However, our deepest expertise and best results come from Klaviyo management. If you’re not on Klaviyo yet, we can help migrate you.
Yes! We’ve migrated dozens of brands from Mailchimp, Constant Contact, and other platforms to Klaviyo. We handle the technical migration (lists, segments, integrations), rebuild all flows from scratch optimized for Klaviyo’s capabilities, and ensure zero disruption to your email program. Migration typically takes 2-4 weeks depending on complexity.
We audit your existing flows first and identify what’s working and what’s broken. Sometimes we can optimize what you have. Often, we recommend rebuilding from scratch with better structure, personalization, and testing. Either way, we ensure there’s no disruption—new flows are built in parallel and switched over once they’re ready.
Yes! Custom email design and copywriting are included in our Growth and Full-Service packages. We don’t use Klaviyo’s generic templates—every email is designed specifically for your brand with custom layouts, imagery, and copy that reflects your voice and drives conversions. For Starter package clients, we can add design/copy as an additional service.
We coordinate Klaviyo with your Meta ads, Google Ads, and other paid channels for cohesive customer journeys. This includes:
(1) Syncing audiences for remarketing.
(2) Triggering email flows based on ad interactions.
(3) Using email engagement data to inform ad targeting.
(4) Coordinating messaging across channels.
(5) Tracking attribution across email and paid media.
Yes! SMS is included in our Full-Service package and can be added to other packages. We work with Klaviyo’s native SMS, Attentive, or Postscript depending on your setup. Our SMS strategy focuses on high-value moments (cart abandon, back-in-stock, VIP offers) without over-texting subscribers. We coordinate SMS with email for true omnichannel messaging.
Email typically drives 25-40% of eCommerce revenue, but only when done right. The difference between a mediocre and expert Klaviyo agency can mean 200-300% more email revenue. For a brand doing $5M/year, that’s the difference between $500K and $1.5M in email revenue. Expert agencies build advanced segmentation, sophisticated flows, and omnichannel strategies that maximize customer lifetime value—not just one-time sales.
Look for agencies that have scaled brands from your revenue level to 3-5x larger. They should demonstrate advanced segmentation beyond basic “new vs. existing” splits, build sophisticated flows (win-back, sunset, VIP nurture—not just the basics), and have a structured A/B testing framework with documented results. Scalable agencies integrate Klaviyo with paid ads, SMS, and loyalty programs rather than managing email in a silo. Ask who will manage your account—it should be a senior team member with 5+ years experience, not a junior learning on your budget.
Our team of experts live, breathe and geek out on marketing, so you don’t have to.
