Data & ResearchMarch 24, 2026•Updated: 6 November 2026

UX & UI design
statistics 2026

Over 40 verified data points on UX and UI design, each linked to its source. From the business value of design and checkout abandonment to mobile traffic and accessibility. Compiled from research by McKinsey, Nielsen Norman Group, Baymard Institute, WebAIM, Google and more.

32%

faster revenue growth for top-quartile design performers over five years

Source: McKinsey, 2018

95.9%

of the top 1 million home pages have detectable WCAG 2 failures

Source: WebAIM Million, 2026

59.9%

of worldwide web traffic came from mobile devices in October 2026

Source: StatCounter, 2026

Statistics overview

User experience has evolved from a nice-to-have into the single biggest differentiator in digital business. Research by McKinsey and the Design Management Institute links strong design to faster revenue growth and higher shareholder returns. Yet 95.9% of the most visited home pages still have detectable accessibility failures. For Dutch companies, what these figures mean when building a site: more on website design and build (in Dutch).

This page compiles more than 40 verified statistics on UX and UI design, sourced from research by McKinsey, Nielsen Norman Group, Baymard Institute, WebAIM, Google, Optimizely and other organizations. Every figure links to the page where we checked it (last check: 6 November 2026). Whether you're building a business case for UX investment, optimising your funnel with a conversion optimisation agency, or planning a redesign: these numbers make the case.

Section 1

ROI of UX design

32%

faster revenue growth for top-quartile design companies vs industry peers (five years)

McKinsey, 2018

56%

faster growth in total returns to shareholders for the same group

McKinsey, 2018

211%

return of design-driven companies over the S&P 500 (10-year period, 2016 edition)

Design Management Institute via Fortune, 2017

Annual growth: top-quartile design companies vs industry peers

Revenue growth, top quartile10%
Revenue growth, industry peers3-6%
Total returns to shareholders, top quartile21%
Total returns to shareholders, industry peers12-16%

Source: McKinsey, The Business Value of Design, 2018 (300 listed companies, 2013-2018)

  • The McKinsey Design Index tracked 300 publicly listed companies over five years: the top quartile grew revenue 32% faster and total returns to shareholders 56% faster than industry peers (McKinsey, 2018). The study is correlational.
  • Design-driven companies in the Design Management Institute's Design Value Index outperformed the S&P 500 by 228% in the 2013 edition and by 211% in the edition released at the end of 2016, both over a 10-year period (DMI via Fortune, 2017)
Section 2

Usability & conversion

Cart Abandonment
70.22%

average documented online cart abandonment rate (50 studies)

Source: Baymard Institute, 2026

Optimized UX
+35.26%

potential conversion increase for large e-commerce sites through better checkout design

Source: Baymard Institute, 2026

First Impression
0.05s

for users to form a first impression of a web page's visual appeal

Source: Carleton University via Nature, 2006

88%

of online shoppers are less likely to return to a site whose performance disappointed them

Source: Gomez survey via Computerworld, 2010

46.1%

of consumers judged a site's credibility partly by its overall visual design

Source: Stanford Web Credibility Project, 2002

  • Extra costs are the top reason to abandon checkout: 40% of US online shoppers who abandoned an order name extra costs (shipping, tax, fees), 19% did not trust the site with their card details, 18% were forced to create an account and 17% found checkout too long or complicated (Baymard Institute, 2026)
  • Checkout forms are too long: the average US checkout shows 23.48 form elements by default (14.88 form fields), while Baymard puts an ideal flow at 12-14 form elements, or 7-8 fields (Baymard Institute, 2026)
  • Speed pays: a 0.1 second faster mobile site lifted retail conversions by 8.4% and travel conversions by 10.1% in a study of 37 European and American brand sites by Deloitte, commissioned by Google (Google / Deloitte via web.dev, 2020)
  • Where the eye goes: in an eye-tracking study, users needed about 2.6 seconds to settle on a section of a home page and spent an average of 5.94 seconds on the main image (Missouri S&T via ScienceDaily, 2012)

A steady UX programme plus a weekly testing cadence — typically the operating rhythm of a dedicated conversion optimisation agency — is what separates single-digit from double-digit conversion rates.

Section 3

Mobile-first design

59.9%

of worldwide web traffic from mobile devices (October 2026)

StatCounter, 2026

53%

of mobile visitors leave if a page takes longer than 3 seconds to load

Google via Marketing Dive, 2016

38.5%

of worldwide web traffic from desktop computers (October 2026)

StatCounter, 2026

89.9%

of people in the EU (16-74) used the internet on a smartphone in 2025

Eurostat, 2025

Worldwide web traffic by device (October 2026)

Mobile
59.9%
Desktop
38.51%
Tablet
1.59%

Source: StatCounter Global Stats, 2026

  • Mobile-first indexing: Google uses the mobile version of a site's content, crawled with the smartphone agent, for indexing and ranking, which makes mobile UX a direct SEO factor (Google Search Central, 2026)
  • The Netherlands is almost fully mobile: 98.3% of Dutch people aged 16-74 used the internet on a smartphone in 2025, against 89.9% across the EU (Eurostat, 2025)

Closing the mobile gap is a joint effort between UX, engineering and content — which is why many brands pair their design team with a content marketing agency that can match design treatments to on-page messaging.

Section 4

Accessibility (WCAG)

95.9%

of the top 1 million home pages have detectable WCAG 2 failures

WebAIM Million, 2026

56.1

average detected errors per home page

WebAIM Million, 2026

1.3B

people worldwide with a significant disability (16% of the world population)

WHO, 2023

$18.3T

global disability market: people with disabilities plus friends and family

Return on Disability Group, 2024

  • The European Accessibility Act (EAA) applies from 28 June 2025: websites and apps where consumers buy or book products or services, and electronic communication services, must be accessible (EU Directive 2019/882). In the Netherlands the ACM supervises webshops (ACM, 2025)
  • Large Dutch webshops are lagging: 61% of about 100 of the largest Dutch webshops were not digitally accessible in ACM tests (ACM, 2026)
  • ADA-related digital accessibility lawsuits reached 5,114 in the US in 2025: 3,195 in federal courts and 1,919 in New York and California state courts. E-commerce accounted for 70% (UsableNet, 2025)
  • Most common WCAG failures on home pages: low contrast text (83.9%), missing image alt text (53.1%), missing form input labels (51%), empty links (46.3%), empty buttons (30.6%), missing document language (13.5%) (WebAIM Million, 2026)
  • Only 20.5% of home pages had 5 or fewer detected errors. WebAIM stresses that the absence of detected errors does not mean a page is accessible or conformant (WebAIM Million, 2026)
Section 5

A/B testing & UX research

12%

of experiments produce a statistically significant improvement on the primary metric

Optimizely, 2026

5

test users find about 85% of usability problems

Nielsen Norman Group, 2000

34

experiments a year run by the median company on Optimizely

Optimizely, 2026

  • Most tests are inconclusive: according to Optimizely, a healthy program has a 35-40% conclusive rate, so roughly 60% of tests do not reach a conclusion (Optimizely, 2026)
  • More variations, more impact: experiments with four variations deliver 3.5x the expected impact of a typical A/B test, and the top 10% of companies by velocity run around 200 tests a year (Optimizely, 2026)
  • Setup quality matters: across 173,000 experiments at 1,200+ companies (2018-2026), soundly designed experiments won 58% of the time versus 35% for poorly designed ones. Optimizely notes these comparisons are observational (Optimizely, 2026)
Section 6

Future predictions

We only list developments that a source confirms. Earlier forecasts on this page (AI generating 40% of UI designs, voice commerce, zero-UI market share) could not be traced to a source and have been removed.

2025

Accessibility becomes law for EU e-commerce

Since 28 June 2025, websites and apps where consumers buy or book products and services must meet the accessibility rules of the European Accessibility Act. In March 2026 the Dutch regulator found 61% of the largest Dutch webshops still not accessible.

Source: ACM, 2025; ACM, 2026

2026

AI enters experimentation

Optimizely customers in the average usage band of its AI features show 70.2% higher experiment velocity and 20.6% higher average test impact than before adopting AI. Optimizely notes the comparison is observational, not causal.

Source: Optimizely, 2026

2026+

WCAG 3 is coming, but slowly

The latest WCAG 3.0 Working Draft is dated 10 September 2026. W3C says WCAG 3 is not expected to be a completed standard for a few more years, will not supersede WCAG 2, and WCAG 2 will not be deprecated until several years after WCAG 3 is finalized.

Source: W3C, 2026; W3C WAI, 2026

Summary

Key takeaways

1

UX ROI is massive

Top-quartile design companies grew revenue 32% faster than peers over five years (McKinsey). Design-driven companies beat the S&P 500 by 211% over ten years (DMI, 2016 edition).

2

Bad UX kills conversions

70.22% of online carts are abandoned. Better checkout design could lift conversion on large e-commerce sites by 35.26% (Baymard).

3

Mobile gap = revenue gap

59.9% of worldwide web traffic is mobile, and 53% of mobile visitors leave a page that takes more than 3 seconds. Mobile speed and UX come first.

4

Accessibility is a must

95.9% of top home pages have detectable WCAG failures and 1.3B people live with a significant disability. With the EAA in force since June 2025 and 5,114 US lawsuits in 2025, accessibility is a legal and business imperative.

5

Testing drives results

Only 12% of experiments win on the primary metric, so volume and setup matter. Five test users already find about 85% of usability problems.

6

AI is reshaping design

AI is speeding up experimentation: Optimizely reports 70.2% higher experiment velocity for customers using its AI. Standards move slower: WCAG 3 is still years from completion.

Methodology & sources

The statistics on this page are compiled from publicly available research. On 6 November 2026 we opened the source of every figure again: figures we could not trace to a source were removed or replaced, and every figure now links to the page where we checked it. International figures are labeled as such. Key sources include:

  • McKinsey and the Design Management Institute: The Business Value of Design (2018), Design Value Index
  • Nielsen Norman Group (NNG): usability testing research
  • Baymard Institute: cart abandonment and checkout usability research (updated 2026)
  • Google, StatCounter and Eurostat: mobile speed research, device market share, internet use by device
  • WebAIM, WHO, ACM, UsableNet and W3C: accessibility of the top 1 million home pages, disability prevalence, EAA supervision, lawsuits and WCAG 3
  • Optimizely: analysis of more than 170,000 experiments

Disclaimer: Figures come from the most recent editions of the cited sources we could open. Commercial surveys and vendor data are marked with the source name. This page is compiled for informational purposes and does not constitute design or strategic advice.

FAQ

Frequently asked questions

What is the ROI of UX design?

Top-quartile companies in the McKinsey Design Index grew revenue 32% faster and total returns to shareholders 56% faster than industry peers over five years (McKinsey, 2018, 300 listed companies). The Design Management Institute found that design-driven companies outperformed the S&P 500 by 211% over ten years (2016 edition). Both studies show correlation, not a fixed return per dollar.

How does UX design affect conversion rates?

The average documented cart abandonment rate is 70.22%, and better checkout design could lift conversion on large e-commerce sites by 35.26% (Baymard Institute, 2026). Users form a first impression of visual appeal within 50 milliseconds (Carleton University, 2006), and a 0.1 second faster mobile site lifted retail conversions by 8.4% (Google and Deloitte).

What percentage of websites meet accessibility standards?

According to the WebAIM Million 2026, 95.9% of the top 1 million home pages have detectable WCAG 2 failures, with an average of 56.1 errors per page; only 20.5% have 5 or fewer errors. This matters because 1.3 billion people live with a significant disability (WHO). The European Accessibility Act has applied since 28 June 2025, and 5,114 ADA digital accessibility lawsuits were filed in the US in 2025 (UsableNet).

UX
Ready to get started?

Conversion-driven UX & design

At Searchlab, we combine data-driven UX insights with marketing expertise to build websites that convert. Let's optimize your digital experience.

Get in touch What we do
Ruud ten Have

Compiled by

Ruud ten Have

Ruud is a digital marketer with 10+ years of experience in online advertising and AI implementation. At Searchlab, he combines strategic thinking with hands-on AI tooling to deliver measurable results for businesses.

About Searchlab

We don’t just collect this data, we apply it daily as an AI-first marketing agency in Amsterdam. Dutch businesses can explore our online marketing uitbesteden services.

[ Free growth analysis ]

See where the
biggest gains are.

  1. TodayName, email and website. That is all we need.
  2. Within 5 working daysA document you can forward to your director or colleagues.
  3. ThenHalf an hour with the specialist who does the work.
You talk to the specialistNot a salesperson

Free, no obligation. We only use your details for the growth analysis.