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Slate Milk

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.

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+53.2%
Increase in email signup rate
+51.9%
Increase in SMS opt-ins
27K+
Zero-party data points collected via quiz-style popup
Hands-off
Alia managed setup, testing, and optimization end-to-end

“The transition process could not have been easier! The team at Alia was great at managing the process and worked with myself and our designer to make sure everything was looking and sounding like we wanted it to.”

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.

Ron Lubin
Director of Marketing
Slate Milk

The Challenge

Popup Tools That Slowed Growth

  • Old platform had a clunky UI, making even basic stats hard to access
  • A/B tests took too long and weren’t scalable for a fast-moving brand
  • Segmentation and analytics were too limited to drive subscription-first growth

“The UI just wasn’t intuitive. Even finding basic statistics was difficult. [...] We were trying to improve opt-ins, but didn’t have the right tools or visibility to do it properly. [...] Finding and executing the right tests was always a struggle. We needed a team with experience to assist.”

Ron Lubin
Director of Marketing, Slate Milk

Solution – Hello Alia

Personalized, High-Performing Popups

  • Alia managed full migration and setup → completely hands-off for the team
  • Introduced quiz-style popup capturing preferences (e.g., morning vs post-workout protein use)
  • Zero-party data flowed directly into Klaviyo for smarter segmentation
  • Continuous A/B testing based on learnings across other brands

“They basically did everything for us to get transferred onto the platform.” “We tested the multiple-choice version, and it instantly worked. We stuck with it from there.”

“We use the survey answers in our Klaviyo flows. It’s incredibly easy.”

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Higher Opt-ins, Better Conversions,
Zero Extra Work

Key Performance Metrics

Email Growth:

+53.2% increase in opt-ins

SMS Growth

+51.9% increase in opt-ins

Zero-Party Data:

27K+ survey responses collected for personalization

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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