
Sérieux Design
Chartres, Centre-Val de Loire
Founded in 2021 in Chartres, the Sérieux Design agency designs digital interfaces and integrates RGAA criteria from the initial mockup stage for public administrations and training institutes.
Founded in 2021 in Chartres, Sérieux Design is an interaction design and digital strategy agency, member of Digital Loire Valley and La French Tech. It works across France on product design, design systems and SEO.
The agency delivers functional mockups, simplified information architectures and clarified user journeys. Accessibility is integrated from the initial design sketches onwards, applying RGAA 4.1 criteria. Interfaces are tested with users to verify readability in real-world conditions.
Its teams work on institutional websites, healthcare and training. For the City of Saint-Dizier, it audited the UX, SEO and accessibility of over 30 public sites. It also assessed two platforms for the Banque des Territoires and redesigned the accessible UX of Assas Formation Continue and Isoform.
Accessibility services offered
Consulting and support, Inclusive design, Accessible development
Consulting and support
The agency reviews interfaces against RGAA criteria, as with audits of Aquagir and Numérique360, and runs collaborative working sessions with internal teams. Its support continues after deployment to help with adjustments, publications and writing documentation.
Inclusive design
RGAA 4.1 requirements are considered from the initial wireframe stage to structure mockups. The approach targets the readability of texts, forms and user paths, to remain accessible at all reading levels.
Accessible development
The interfaces produced remain functional on mobile, desktop, tablet, screen reader or older software versions. The agency handles redesigns of institutional sites according to RGAA, adjusting its recommendations to fit existing technical constraints.
Quote from the provider website
“Nous intégrons les exigences du RGAA 4.1 dès les premiers wireframes. Mais surtout, nous concevons des interfaces qui tiennent compte des situations réelles, pas juste des normes.”
Client references
Krug, Ville de Saint-Dizier, PFG – Pompes Funèbres Générales, Bob Le Menuisier, Watèa by Michelin, BiwiZ, OpenHive by Bee2link, Soeman, Assas Formation Continue, Isoform, Mosaic Maker, Banque des Territoires.


