How Slate Milk Increased Email Signups by 53.2% & SMS Opt-ins by 51.9% With Alia
Slate Milk, the fast-growing protein shake and iced coffee brand, turned to Alia to escape the limitations of their old popup tool. The result: higher opt-ins, better compliance, and 27K+ zero-party data points collected—without adding work for their lean team.
The Full Story in 60 Seconds
It was incredibly hands-off for our team, and still one of the most high-impact tools we’ve used… We saw a clear lift across every metric that mattered: opt-ins, conversions, revenue. They set everything up, recommended tests, and helped us improve signup rates across the board.
CHALLENGES
Popup Tools That Made Testing and Scaling Frustratingly Hard
Before switching to Alia, Slate Milk used a legacy popup platform that, on paper, seemed built for email capture, but the experience told a different story.
The UI just wasn’t intuitive. Even finding basic statistics was difficult.
As a fast-moving brand, they wanted to optimize and improve conversion rates constantly, but the platform made testing feel more like a chore than a growth lever.
As a subscription-first business, growing their email and SMS list was the key to driving conversions from window shoppers. However, their old tool lacked the segmentation, analytics, and flexibility needed to unlock that growth.
Slate Milk needed a better popup solution and a partner who could handle the heavy lifting.
SOLUTION
Personalized, High-Performing Popups Without the Operational Drag
Slate Milk needed a popup solution that could help them grow their list fast, run A/B tests without friction, and give their lean team the insights they needed to improve performance. That’s where Alia came in.
They basically did everything for us to get transferred onto the platform.
Here's what made the difference:
Alia’s onboarding was refreshingly hands-off for the brand. From day one, Alia’s team led the setup, recommended tests based on benchmarks from other brands, and handled all the heavy lifting.
The first big win came from A/B testing multiple-choice popup flows, which outperformed their original format and helped them quickly increase both email and SMS opt-ins.
With built-in survey logic, Slate Milk began collecting zero-party data at sign-up, like when customers preferred to have their protein. These insights fed directly into their Klaviyo flows, powering better segmentation and more relevant messaging.
The switch also gave the brand more visibility into their data. Their previous platform didn’t offer clear stats on conversion or performance. But with Alia, they could finally track opt-in performance across formats and devices.
Slate Milk leveraged Alia to grow faster, test smarter, and make their signup experience work harder.
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Higher Opt-ins, Better Conversions,
Zero Extra Work
Key Performance Metrics
Email Growth:
SMS Growth
Zero-Party Data:
Additional Benefits
- Smarter Data: Zero-party data at signup unlocked lifecycle personalization
- Operational Relief: The lean team could stay focused on growth
- Validated Value: Discount-driven subscribers didn’t underperform
- Continuous Optimization: A/B testing turned popups into a real growth lever
“Normally, you’d think discount shoppers would convert at lower AOVs—but this data proved otherwise. [...] They handle setup, launch, and testing. We just sit back and see what wins.”
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Your Success Story
Starts Here
Slate Milk is one of many fast-growing DTC brands using Alia to increase opt-ins, collect zero-party data, and drive real revenue—without adding internal overhead.
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