Design System Inspiration of Qonto

1. Visual Theme & Atmosphere

Qonto is a business account and finance tool for small companies and freelancers — "Made in France in 2017", in its own words, and now serving more than 600,000 customers across eight European markets. Its founders, Alexandre Prot and Steve Anavi, "set out to build the solution they wish they'd had: transparent, efficient, and designed around" the people running small businesses. Its newsroom now describes Qonto as a finance management solution for SMEs, adding tools such as invoicing and bookkeeping to the account.

The site is confident and editorial: near-black #050505 and white, set in large sizes — display steps run to 128px — in QontoSans, the company's own typeface, with full-bleed dark and light sections alternating down the page. Colour comes in soft pastel families — blueberry, plum, peach, sakura, mint, mustard — used for tints and highlights rather than for the actions, which stay black.

What makes it worth reading:

• The brand is black. --color-primary-black #050505 is the ink, the primary button and the hover wash; the brand colour is typographic, not chromatic.
• Pastels come as families with highlights. Each has 50–1000 steps and a translucent highlight (--color-highlight-plum #d5c8ff80, --color-highlight-mint #c8ffec80).
• One sticker shadow. --shadow-xl is -4px 4px 0 0 #1d1d1b — a hard, unblurred offset, unlike the soft shadows beside it.

Primary tasks

• Open a business account; compare plans and prices.
• Learn about cards, payments, invoicing and financing.

2. Color Palette & Roles

Measured with getComputedStyle on qonto.com/fr and /fr/pricing: 287 root custom properties. The site is built with Tailwind v4, and Tailwind's own values are excluded: 32 --tw-*, 57 --color-* entries that are Tailwind's stock oklch() palette, the stock --radius-*, --font-mono and font weights, and the stock --text-* rem scale. About 96 colour tokens remain, Qonto's own.

Black and grey

• Primary (#050505) — --color-primary-black. The primary button, and the ink.
• Foreground (#050505) — 1,368 text elements. Plain #000000 also appears on hundreds of elements; both blacks are in use.
• Pressed (#373737) — the primary button pressed.
• --color-grey-*: #1a1a1a (900) · #262626 (800) · #3d3d3d (700, the tabs) · #616161 (600, secondary text and link hover) · #8f8f8f (500) · #cccccc (300) · #e0e0e0 (200) · #e8e8e8 (100) · #f5f5f5 (50, surface) · Canvas #ffffff.

Pastel families

• Blueberry (#3275c4) — 500; with #dceaff (blueberry-product-100) and #e0eafb (-product-50) as the pricing-card tints (70 elements on the pricing page), and #093b75 (blueberry-1000) and #163470 (blueberry-product-1000) as dark bands.
• Plum (#6e45e3) with #d5c8ff at 50. --color-plum-dark and --color-blueberry-dark are the same #3020d8.
• Peach 50 #ffc9a6 · Sakura 50 #ffdfea · Mint 50 #c8ffec · Mustard 50 #faffa4 — each with a matching translucent highlight at 50% (#ffc9a680, #ffdfea80, #c8ffec80, #faffa480).

Status

Success #0f7a3d · Danger #b81818 (--color-red-1000) · Warning #b04e10.

3. Typography Rules

Font family

QontoSans — --font-sans: "QontoSans" — on body, headings and buttons. 300, 400, 600 and 700 load (document.fonts), self-hosted as woff2 under qonto.com/blog/assets/; 900 is declared and did not load. PolySans and Yrsa are declared in the same stylesheet and did not load on the pages measured.

Scale

Qonto adds pixel display steps to Tailwind's rem scale: --text-20 20px · -22 22px · -40 40px · -72 72px · -88 88px · -128 128px. Buttons, navigation and tabs are 16px at 400 — the weight stays regular even on actions.

4. Component Stylings

Three components, measured on the pricing page after dismissing the consent banner (Didomi), focus read under a real Tab key.

• Primary — Démarrer: #050505, white 16px/400, 8px radius, 48px, 12px 16px. Hover fades it to rgba(29,29,27,0.92); press lightens it to #373737.
• Outline — the other Démarrer: transparent with a #050505 border and label, 48px. Hover washes it with rgba(29,29,27,0.08), press with rgba(29,29,27,0.12).
• Tabs — the plan segments: #3d3d3d label, 4px radius, 44px. Hover turns the label #000000.

Both button variants take their states from the same near-black #1d1d1b at different opacities. In the transparent header on the home page, the account-opening button appears white with a black label.

Focus is the browser's

Every measured control shows Chrome's auto ring under :focus-visible. No focus colour is recorded.

Radius

Rendered: fully round ×71 (pills and avatars), 24px ×42 (cards — not a Tailwind step), 8px ×37 (buttons), 6px, 4px, 32px.

5. Layout Principles

• Full-bleed sections alternate dark and light.
• Cards at 24px radius; pricing plans on blueberry tints.

6. Depth & Elevation

--shadow-sm and --shadow-md are soft, conventional; --shadow-lg is 1px 0 10px 2px #0000001a; --shadow-xl is a hard offset, -4px 4px 0 0 #1d1d1b, for accent cards.

7. Do's and Don'ts

Do

• Use near-black #050505 for actions and text; let pastels tint surfaces.
• Keep type regular weight on buttons and go very large for display.
• Use the hard -4px 4px 0 #1d1d1b shadow only for accent cards.

Don't

• Don't count Tailwind's stock oklch palette as Qonto's colours.
• Don't use a pastel as a button colour.
• Don't treat the two blacks as interchangeable tokens — --color-primary-black is the authored one.

8. Responsive Behavior

Not measured. Desktop 1440×1000 only.

9. Agent Prompt Guide

Quick Color Reference

#050505 black · #ffffff white · #f5f5f5 surface · #3d3d3d / #616161 greys · #3275c4 blueberry · #dceaff blueberry tint · #093b75 navy band · #6e45e3 plum · pastels #ffc9a6 #ffdfea #c8ffec #faffa4

Example Component Prompts

• "A 48px button: #050505, white 16px/400 QontoSans, 8px radius; hover rgba(29,29,27,0.92), press #373737."
• "A pricing card on #dceaff, 24px radius, a 72px QontoSans price."

10. Voice & Tone

Not assessed as authored voice.

11. Brand Narrative

Qonto was built by founders frustrated with traditional banking, for small businesses that had been underserved by it, and its site speaks with the confidence of a company that has grown to hundreds of thousands of customers: black and white, huge type in its own face, and colour held back for soft tints and highlights. The system is a Tailwind build with a thin, deliberate layer of brand tokens on top — a black, a grey ramp, six pastel families and a type scale that runs off the chart.

12. Principles

• Black is the brand. Colour is for tint, not for action.
• Type does the talking. QontoSans, very large.
• Soft, then one hard edge. Pastels and soft shadows, with a single sticker shadow for accents.

13. Personas

Not researched. No persona claim is made from a UI capture.

14. States

Three components. Hover: the primary fades, the outline washes 8%, tabs turn black. Press: #373737 and a 12% wash. Focus is the browser's auto ring. The navigation's mega-menu triggers were not measured. No disabled state was observed.

15. Motion & Easing

Fifteen --animate-* shorthands are declared — fadeinUp with four delays, navbarIn, overlayFade, highlight, arrow-enter/exit-250 among them — alongside Tailwind's stock easings.

Tier 1 sources: https://qonto.com/fr (live homepage — 287 root custom properties read via getComputedStyle, Tailwind v4 values excluded; QontoSans loaded, captured 2026-09-26); https://qonto.com/fr/pricing (pricing page — three components measured at rest, hover, pressed and focus after dismissing the consent banner, captured 2026-09-26); https://qonto.com/zz-this-does-not-exist (nonsense-path control — "404 Page not found — Qonto", captured 2026-09-26); https://qonto.com/en/about (About Qonto — "Made in France in 2017", 8 European markets, 600,000+ customers, founders Alexandre Prot and Steve Anavi, read 2026-09-26); https://qonto.com/en/press (Qonto newsroom — "Launched in 2017 by Alexandre Prot and Steve Anavi", read 2026-09-26)