Ylly agency

We are a digital agency based in Paris and Lille, born from design and technology. We specialize in building digital strategies through UX design, interface creation, web & mobile development and SEO and SXO data analysis.

We bring together expertise and talents to support you in the success of your digital projects


Our agency, with its 10 years of history, provides solutions to clients of different sizes throughout France and internationally.

Our agency was founded by Eric with the aim of offering support from passionate experts, close to you and your needs, with the dual objective of performance and human relations based on trust, the two pillars of our activity.

Since 2020 we have been part of the Castelis business group: 6 companies each with their own specificities in the digital world.

This is all additional expertise that we offer our clients. We develop tailor-made projects, designed for the needs of your target: business platforms, websites and mobile applications. We provide answers tailored to your needs through methodologies and design processes based on 'design thinking'.

Whether it is a product or a service, our goal is to solve the user's difficulties and therefore satisfy their need.

Eric Vincent
Founder and director of the agency
Group Castelis
Business group

Our pillars

In addition we are committed

We are committed to good causes, our wish being to share our skills and expertise with players who are working to improve our future.

Ylly Agency
Ylly Agency 2

The team behind our success

A team of thinkers and innovators determined to reinvent the way we think about digital, who love to use technology and design to create meaningful experiences.

We have runners, cyclists, yogis, photographers, travelers, illustrators, musicians, gamers ... we have Brazilians, Argentines, Italians, Parisians, Lille ...

We believe that the sum of this diversity allows for a deeper exploration of innovative, sensitive and creative solutions.

For this reason, we promote an environment that facilitates the sharing of different experiences and worldviews.

And it is at the Ylly agency that this diversity of talents and passions meet, to create value for your projects.

Our agency life