Brochure sites, e-commerce and web applications - we build the digital tool that fits your business: fast, responsive and built to convert.
See what your future site could look like before development: design, page structure and user journey. No commitment.
Rationa Lab helps businesses build custom websites: brochure sites, online stores and business web tools. Based in the Paris area, we work across France - from design to launch.
Redesign or full build: we handle design, technical performance (Core Web Vitals), organic SEO and integration with your tools. The goal is a site that turns visitors into customers.
Transparent pricing for the build, and optional post-launch maintenance - monthly contract or on-demand support.
Your digital storefront to present your business, build trust and generate leads.
Each level builds on the previous one with more capabilities.
| Feature | Brochure | E-commerce | Custom |
|---|---|---|---|
| Custom responsive design | |||
| Technical SEO & Core Web Vitals | |||
| Forms & conversion pages | |||
| Blog & content management | |||
| E-commerce & online payment | |||
| Online appointment booking | |||
| Client portal & business tools | |||
| AI integration & automations |
Keep your site monitored, secure and evolving - monthly contract or on-demand, depending on your needs.
Deployment on modern, reliable infrastructure (including Vercel for sites we deliver).
Technical fixes and security updates when needed.
New pages, features or integrations as your business grows.
Guidance so your team stays autonomous on site content.
Maintenance is quoted separately - monthly contract or one-off interventions.
A clear, demanding framework to move your project forward with confidence.
Our sites are custom-built for performance and reliability. You get a dedicated contact and human support at every step.
Once delivered and paid, the site and its content belong to you.
You talk directly to the team designing and building your project.
Speed, structure and technical best practices built in from day one.
We help you take control of your site so you can stay autonomous.
Every site includes SEO foundations: structure, speed, tags and mobile experience. We can go further with tailored content and visibility support.
See how we've helped other businesses go digital.
A premium digital presence for a private driver service in the Paris region. The experience highlights the high-end positioning, builds trust and makes it easier for visitors to get in touch.
Visit websiteProject 1 / 4
Your site is stronger with our complementary expertise: business tools, apps and AI.
Brochure sites, online stores and journeys built to convert visitors.
You are here →Client portals, platforms and software adapted to your workflows.
Discover →Assistants, document sorting and automations connected to your business.
Discover →The most common questions before starting your project.
A brochure site starts from €750 depending on scope. E-commerce, complex redesigns and custom tools get a personalized quote after an initial conversation.
A brochure site can be delivered in a few weeks. E-commerce or custom projects often take 1–3 months, sometimes more depending on complexity.
Yes, from day one: structure, performance, tags and responsive design. Content SEO support can be added based on your visibility goals.
Yes. All our sites are mobile-first: readable, fast and pleasant on phones and tablets.
Yes. We include training so you can update text and images on your own, depending on the solution chosen.
Yes - updates, fixes, hosting and evolution, on monthly contract or on demand.
Describe your project or book a slot: first contact is free with no commitment.
Reply within 48h · Transparent quote · No commitment