Global fashion eyewear brand Gentle Monster, faced the challenge of evolving privacy regulations and a reduced reliance on cookies, which were impacting the accuracy of their ad performance measurement.
As a trendsetter in the industry, Gentle Monster continuously seeks ways to refine its digital marketing strategies and better understand consumer behavior. To address the impact of changing privacy regulations and the diminishing role of cookies, the brand partnered with Jellyfish to find a data-driven solution that would deliver more precise performance insights and support their forward-thinking approach.
The Jellyfish Analytics team implemented a server-based Meta Conversions API (CAPI), reducing data loss from browser-transmitted pixel events and enabling high-quality data collection for improved targeting and measurement accuracy. To evaluate the impact of CAPI, the Jellyfish team carefully monitored Gentle Monster's always-on purchase campaigns, analyzing performance data before and after the CAPI implementation.
“With 3rd-party cookie restrictions limiting targeting, a solution was needed to minimize data loss and improve accuracy for high-engagement users. Implementing the server-based "Conversion API" enhanced data quality, significantly boosting ROAS.”
– Gentle Monster Marketing Manager
The adoption of Meta Conversions API helped Gentle Monster successfully navigate the challenges of a privacy-first digital landscape, driving measurable growth in advertising efficiency:
Increase in Return on Ad spend
Decrease in average CPA (Purchase)
Additional Purchase conversion reported
We're excited to welcome Seun Odeneye as our new Chief Media Officer EMEA. Seun's appointment marks a decisive step in Jellyfish's ambition to build EMEA's first truly agentic media practice, bringing media, strategy, investment, and content together under one AI-native proposition across the region.
Read News
Natasha Wallace recently jumped on the That's What I Call Marketing Podcast with Conor Byrne to unpack the trap of "brand flattening," and why stripping out emotion to satisfy LLMs is a massive mistake. Listen to the full conversation here.
Read Article
John Dawson, VP Strategy at Jellyfish, recently joined Dylan Conroy on The Ad Podcast to explore one of the biggest questions facing marketers today: AI has an opinion about your brand. Now what? The conversation went beyond the familiar debate around AI search and SEO. Instead, John explored what happens when AI becomes part of the way people discover, evaluate and ultimately choose brands.
Read Article
To mark the 25th anniversary of the cult horror franchise, Final Destination returned in 2025 with Final Destination: Bloodlines. Warner Bros partnered with Jellyfish to design a bold, eerie activation designed to reintroduce the saga and tap into Gen Z's taste for twisted thrills.
Read More