A beautiful site that doesn't convert is a cost .
Data-driven design, not ego-driven.
Research & UX audit
Understand before designing.
Audit of the existing experience, journey analysis, friction point identification. We look at where your visitors drop off — with data, not assumptions.
Conversion-first interfaces
Every screen has a goal.
Wireframes, prototypes, mockups — in that order. Baymard and Nielsen principles applied to every decision. Your visitor knows what to do within 5 seconds.
Design system
Your brand that scales without diluting.
Colors, typography, components, interactive states — all documented and reusable. Website, app, internal tools: same identity, zero reinvention.
Testing & iterations
Measure, don't guess.
Heatmaps, session recordings, A/B testing. A repositioned button can increase conversions by 20%. We optimize continuously based on facts.
We redesigned our own product before touching yours.
Coddy — urban escape games in 9 countries. Thousands of players on mobile, in the streets, with a timer. The booking flow went from 7 steps to 3. Completion rate: +20%.
At Numinam, we apply the same rigor to your site and your tools.
— Sebastien, founder
How we design your interface
UX audit of the existing experience
Wireframes and validation
Mockups and prototypes
Handoff and iterations
Numinam vs the alternatives
| Numinam (data-driven UX) | Creative agencies | Templates & DIY | |
|---|---|---|---|
| Design objective | Measurable conversion | Aesthetics & creative awards | Speed to launch |
| User research | UX audit, data, tested journeys | Mood boards & art direction | None |
| Wireframes & prototypes | Systematic before every mockup | Sometimes, depending on budget | Non-existent |
| Design system | Delivered and documented | Rarely included | Non-existent |
| Post-launch testing | A/B testing, heatmaps, iterations | Rarely offered | Your responsibility |
| Accessibility | WCAG 2.1 AA from the start | On request | Rarely compliant |
Design objective
User research
Wireframes & prototypes
Design system
Post-launch testing
Accessibility
No surprise quotes. Here's what it costs.
The price depends on the scope — number of screens, level of research, journey complexity.
Frequently asked questions about UX/UI design at Numinam
How much does a UX audit cost at Numinam?
A UX audit at Numinam costs between €2,000 and €5,000 depending on the size of the site and the number of user journeys to analyze. It includes friction point analysis, a competitive benchmark, and a report prioritized by business impact. Delivered in 1 to 2 weeks.
How long does a UX/UI redesign take with Numinam?
A full UX/UI redesign — from audit to final mockups with design system — takes between 4 and 8 weeks at Numinam. The audit alone takes 1 to 2 weeks. A project with ongoing optimization (A/B testing, monthly iterations) continues as a retainer.
What's the difference between UX and UI at Numinam?
UX (User Experience) covers structure, user journeys, and navigation logic — it's what ensures a visitor finds what they're looking for and takes action. UI (User Interface) covers visual design — colors, typography, components. At Numinam, the two are inseparable: we structure first (wireframes), then design (mockups). Design serves conversion, not the other way around.
Does Numinam do UX design for mobile apps or only websites?
Numinam designs interfaces for websites, mobile applications, and internal tools (dashboards, CRMs, client portals). The methodology is the same: audit, wireframes, mockups, interactive prototypes, dev-ready handoff. Every project is designed mobile-first.
Does my team need to be involved in the UX process at Numinam?
Yes, but in a targeted way. Numinam needs 2 to 3 validation sessions with your team — one for the audit, one for wireframes, one for mockups. That's about 3 to 4 hours total. The rest of the work is handled entirely by Numinam.
How does Numinam measure the ROI of a UX/UI redesign?
Numinam measures the ROI of a UX/UI redesign through concrete indicators: before/after conversion rate, form completion rate, bounce rate, time spent on key pages. This data is collected via heatmaps, session recordings, and A/B tests. The goal is always measurable business impact, not subjective aesthetic improvement.
What happens to the mockups and design system after the project with Numinam?
Everything belongs to you. The Figma files, the documented design system, the handoff specifications — you own it all. Your team or another provider can reuse and evolve them. No lock-in, no recurring license.
How does Numinam protect user data collected during UX testing?
Data collected during UX tests (heatmaps, session recordings) is anonymized and hosted on GDPR-compliant European servers. Numinam does not collect any personally identifiable data without explicit consent. The tools used (Hotjar, Microsoft Clarity, or equivalents) are configured to exclude sensitive fields.
A conversion rate from 1.5% to 3% = 360,000€/year recovered.
On 10,000 monthly visitors, that's 150 extra leads per month. At 200€ per lead: 30,000€ in recovered value every month.
30 minutes to identify the 3 UX issues costing you the most. Free. No commitment. With Sebastien, not a salesperson.