Ten months after we took over Blackline Car Care's email program, monthly Klaviyo-attributed revenue was 10x higher, the list was 4.5x larger and every subscriber was worth 2.3x more.
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The brand
Blackline Car Care makes premium car care for enthusiasts and detailers: foam cannons, wash kits, drying towels and a tight lineup of soaps and protectants. It started in the founder's own garage and sells direct, with a blacked-out look that has to hold up on the shelf and in the inbox.
The challenge
- About 20,000 subscribers sitting in Klaviyo with no way to grow the list: no signup form at all.
- Roughly one campaign a month, sent as a one-off when there was a sale.
- No segmentation. Every subscriber got the same offer.
- Flows that covered the basics but left most of the customer lifecycle untouched.
- No way to tell what a subscriber was worth, so no way to prioritize.
The goal
- Give the list a mechanism to grow on its own.
- Turn email from an occasional sale blast into a dependable revenue channel.
- Raise the value of every subscriber, not just the count.
- Report numbers the founder could defend.
The strategy
- Build in the order that pays: capture first, then flows, then a campaign system, then optimization.
- Benchmark every metric against the top decile, not the platform's "Good" badge.
- Run SMS alongside email instead of repeating it.
- Track revenue per subscriber every month, next to list size.
The execution
- Signup form first. A new form gave the list a way to grow from day one.
- Full flow architecture. Welcome, browse, cart, checkout, post-purchase, replenishment and win-back, so revenue stopped depending on someone remembering to hit send.
- An SMS welcome built to work with the email welcome, not against it.
- A real send calendar. Launches, daily deals, product education and founder stories, each with a reason to exist.
- Offer testing. Offers were tested as hard as subject lines, and winners became the default.
- A weekly KPI review against top-decile benchmarks, every week for ten months.
The results
- +917% (10.2x) monthly Klaviyo-attributed revenue, July 2025 to May 2026
- +350% (4.5x) list size
- +125% (2.3x) revenue per subscriber per month
- +818% (9.2x) daily revenue from the automated flow layer
- 129x the platform's average revenue per recipient on the SMS welcome
Why this worked
- Order beat tactics. Every layer multiplied the one built before it.
- Value per subscriber did the heavy lifting. If revenue per subscriber had stayed flat, the bigger list alone would have produced less than half of the final result.
- Flows compound. Every improvement applied to every new subscriber from that day on.
- Weekly measurement caught what wasn't working before it cost a month.
The work
In their words
"Working with Aaron and Audens Media was a game-changer. He set up a thorough analysis and backed every claim with facts. He set realistic expectations and achieved all of them. The results exceeded our expectations."
Jon McKnight, Founder, Blackline Car Care
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