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Custom website creation

Brochure sites, e-commerce and web applications - we build the digital tool that fits your business: fast, responsive and built to convert.

Brochure siteE-commerceWeb applicationBuilt-in AI
Free

Your design mockup, on us

See what your future site could look like before development: design, page structure and user journey. No commitment.

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A site that reflects you and works for your business

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.

Clear offers for your ambition

Transparent pricing for the build, and optional post-launch maintenance - monthly contract or on-demand support.

Brochure website

Your digital storefront to present your business, build trust and generate leads.

  • Unique design for your brand
  • Mobile optimization and fast loading
  • Technical SEO foundations (structure, tags, performance)
  • Contact forms and social media integration
  • Training to update text and images

From €750

Indicative price - personalized quote based on your needs.

Compare offers at a glance

Each level builds on the previous one with more capabilities.

FeatureBrochureE-commerceCustom
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

Maintenance & support

Keep your site monitored, secure and evolving - monthly contract or on-demand, depending on your needs.

Hosting & go-live

Deployment on modern, reliable infrastructure (including Vercel for sites we deliver).

Corrective maintenance

Technical fixes and security updates when needed.

Feature evolution

New pages, features or integrations as your business grows.

Training & support

Guidance so your team stays autonomous on site content.

Maintenance is quoted separately - monthly contract or one-off interventions.

Your Rationa Lab

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.

Full ownership

Once delivered and paid, the site and its content belong to you.

Dedicated contact

You talk directly to the team designing and building your project.

Performance & SEO

Speed, structure and technical best practices built in from day one.

Training included

We help you take control of your site so you can stay autonomous.

What we commit to

  • Design and UX aligned with your brand
  • Content creation in collaboration with you
  • Performance and technical SEO optimization
  • Personalized training and support

A great site still needs to be found

Every site includes SEO foundations: structure, speed, tags and mobile experience. We can go further with tailored content and visibility support.

  • Technical structure suited for search engines
  • Optimized titles, metadata and images
  • Fast, mobile-first site (Core Web Vitals)
  • Google Analytics and Search Console setup
  • Content and SEO strategy support on quote
First conversation free

A first look at your opportunities

Real results for our clients.

See how we've helped other businesses go digital.

Video preview for project Traveluxcity

Traveluxcity

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.

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Project 1 / 4

A website never works alone

Your site is stronger with our complementary expertise: business tools, apps and AI.

Web & conversion

Websites & e-commerce

Brochure sites, online stores and journeys built to convert visitors.

You are here
Custom-built

Apps & business tools

Client portals, platforms and software adapted to your workflows.

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Productivity

AI & automation

Assistants, document sorting and automations connected to your business.

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Website creation FAQ

The most common questions before starting your project.

01How much does a website cost?

A brochure site starts from €750 depending on scope. E-commerce, complex redesigns and custom tools get a personalized quote after an initial conversation.

02How long does it take to build a site?

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.

03Will my site be SEO-ready?

Yes, from day one: structure, performance, tags and responsive design. Content SEO support can be added based on your visibility goals.

04Will my site work on mobile?

Yes. All our sites are mobile-first: readable, fast and pleasant on phones and tablets.

05Can I update the site myself?

Yes. We include training so you can update text and images on your own, depending on the solution chosen.

06Do you offer maintenance?

Yes - updates, fixes, hosting and evolution, on monthly contract or on demand.

Ready to launch your website?

Describe your project or book a slot: first contact is free with no commitment.

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