Web Development Statistics 2026: Results From 1,100+ Agency Case Studies

Most web development statistics are about the industry, not the work: how many developers there are, which frameworks they use, what a build costs. They don't tell you what a new site or platform actually did for a client.

This page does. Every number below is counted from 1,140 web development case studies published by 128 marketing agencies, all indexed in OpenServed's directory. Each case study names a client and states the results the agency reported: traffic, leads, revenue, conversion rate, page speed and on-site engagement.

Data as of November 2026. These are results agencies chose to publish, so they show what a successful build looks like, not what an average one does. The directory keeps growing, so if you cite a number, please cite the date.

Web development statistics at a glance

• 1,140 web development case studies from 128 agencies, covering 117 industries and clients in 29 countries and territories.
• 60% is the median reported increase in website traffic. Half of the 226 case studies that state one fall between 26% and 129%.
• 99% is the median reported increase in conversions or leads (90 case studies) and 71% in revenue or sales (115 case studies).
• 43% is the median reported increase in conversion rate, across 42 case studies.
• 49% is the median reported cut in page load time, and 14% the median reported drop in bounce rate.
• 36% of web development case studies contain no number at all. They describe what was built, not what it achieved.
• Only 30% report a business outcome: revenue, leads, conversions or conversion rate.
• 61% of web development case studies also list Web Design. The 39% that are development only report revenue and page speed more often.
• Web development sold with SEO reports a measured result 79% of the time, against 37% without SEO.
• Only 5% are Client-verified, and none record how long the project took.

What web development case studies report

Traffic is the result agencies report most. 26% of web development case studies include a website traffic stat. Conversions or leads appear in 15%, revenue or sales in 15% and on-site engagement, such as time on site, pages per session or engagement rate, in 12%. Keyword rankings appear in 7%, page speed in 7%, conversion rate in 5%, bounce rate in 3% and accessibility in 2%.

36% of web development case studies contain no number at all. 410 of the 1,140 list only what was delivered, such as "Delivered Website Design & Development", "Brand refresh and redesigned website" or "New Care Navigator portal that helps employees find support". They show the work, not the result.

Only 30% report a business outcome. That means revenue, leads, conversions or conversion rate. The other 70% stop at traffic, engagement, speed or a description of the build.

Web development results are often descriptions, not percentages. Only 42% of result stats are percentages, against 62% for SEO and 68% for PPC. The 1,140 case studies carry 2,938 result stats, an average of 2.6 each, and 36% of those stats contain no number.

Web development traffic statistics

The median web development case study reports a 60% increase in website traffic. 226 case studies state a percentage gain in traffic, sessions or users. A quarter report 26% or less, and a quarter report 129% or more.

Two in three report a traffic gain under 100%. A new build usually replaces a site that already has visitors, so percentage gains tend to be modest. The full spread:

• Under 25%: 22% of case studies
• 25% to 49%: 23%
• 50% to 99%: 21%
• 100% to 199%: 19%
• 200% to 499%: 9%
• 500% to 999%: 3%
• 1,000% or more: 3%

Organic traffic grows about as much as traffic overall. Where the stat specifies organic or search traffic, the median gain is 57% across 123 case studies, with the middle half between 29% and 161%.

The median reported growth in keyword rankings is 72%. 26 case studies state one, with the middle half between 49% and 205%.

Web development conversion, lead and revenue statistics

The median reported increase in conversions or leads is 99%. 90 case studies state a percentage gain, with the middle half between 40% and 273%. Taken separately, the median is 88% for leads (56 case studies) and 124% for conversions (41 case studies).

The median reported increase in revenue or sales is 71%. 115 case studies state one, with the middle half between 30% and 172%. This includes orders, transactions and average order value.

Revenue is reported as often as leads. 15% of web development case studies include a revenue stat, the same share as conversions or leads. For web design, leads are reported almost twice as often as revenue. Many development projects are online stores, where sales are the natural measure.

The median reported increase in conversion rate is 43%. 42 case studies state one, with the middle half between 21% and 89%. 24% report that the conversion rate at least doubled.

Web development speed, bounce rate and engagement statistics

The median reported cut in page load time is 49%. 35 case studies state one, with the middle half between 37% and 70%. Where a case study gives load times before and after in seconds, we converted them to a percentage cut.

Speed is reported twice as often as in web design. 7% of web development case studies give a page speed result, against 3% of web design case studies. It is still a small share: 93% of web development case studies don't say whether the site got faster.

The median reported drop in bounce rate is 14%. 29 case studies state one, with the middle half between 9% and 25%. That is a relative drop: a bounce rate of 60% falling by 14% ends at about 52%.

The median reported increase in time on site is 33%. 45 case studies state one, with the middle half between 17% and 62%. Pages per session or page views rise by a median of 46% (32 case studies), and engagement rate by 42% (41 case studies).

14% name the platform the site was built on. WordPress is named most often, in 61 case studies, followed by Magento or Adobe Commerce (46), Shopify (16) and WooCommerce (14).

Migrations rarely report what happened to traffic. 96 case studies (8%) describe a migration, replatform or rebuild, such as moving to Magento 2 or Webflow. Only 27% of them report any measured result, and only 10% report traffic, the number a migration most often puts at risk.

Web development with SEO vs without SEO

Web development is sold in two different ways. 356 of the 1,140 case studies (31%) also list SEO as a service, and 784 (69%) don't. The two groups report very different things.

With SEO, agencies report results. Without SEO, they mostly describe the build. 79% of case studies that include SEO report at least one measured result, against 37% of those that don't. A traffic stat appears in 54% against 14%, and a revenue, lead or conversion stat in 39% against 26%.

The clients are different too. Where web development is sold with SEO, 56% of clients with a known size are small businesses and 4% are enterprises. Without SEO, 40% are enterprises and 20% are small businesses.

With SEO, reported gains are two to three times as high. The median reported traffic gain is 76% with SEO (161 case studies) against 36% without (65). For conversions or leads it is 156% (54 case studies) against 51% (36), and for revenue 107% (48) against 41% (67).

Development only vs development with design

61% of web development case studies also list Web Design. 701 of the 1,140 cover both, and 439 (39%) are development only. For the design side, see Web Design Statistics 2026 and Web Design vs Web Development.

Development-only case studies report results more often. 58% report at least one measured result, against 45% of those that include design. They report revenue more often (20% against 11%) and page speed more often (9% against 6%). Case studies with design report traffic and on-site engagement more often.

Development-only projects skew toward large clients. Enterprises are 38% of development-only case studies with a known size, against 16% of those with design.

The results point in different directions. Development-only case studies report a higher median traffic gain, 80% (72 case studies) against 53% (154). Case studies with design report higher gains in revenue, 83% (52) against 60% (63), and in conversions or leads, 124% (47) against 88% (43).

Web development for ecommerce

A quarter of web development case studies are ecommerce builds. 290 of the 1,140 (25%) are for retail and ecommerce clients or mention an online store, a commerce platform, orders or checkout.

Ecommerce builds report a median 60% increase in revenue or sales. 73 case studies state one, with the middle half between 30% and 118%. 36% of ecommerce builds report a revenue stat, against 15% of all web development case studies.

The median reported increase in conversion rate is 40% across 24 ecommerce case studies, with the middle half between 18% and 100%. The median traffic gain is 69% (40 case studies).

How web development is sold

87% of web development case studies bundle another service. Only 152 of the 1,140 list Web Development alone. The average case study lists 2.4 services.

Web design is the most common partner by far. Web Design appears alongside in 61% of web development case studies, SEO in 31%, PPC in 11%, Branding in 10%, Content Marketing in 6% and CRO in 4%.

Web development sold with no other service is mostly enterprise work, and rarely measured. 57% of those case studies with a known size are for enterprises, and only 28% report any measured result.

Web development statistics by industry

To make 117 industry labels comparable, we rolled them up into 13 groups (see methodology).

Retailers and manufacturers are the biggest buyers. Retail & Ecommerce accounts for 15% of web development case studies (174), followed by Industrial & Manufacturing (15%), Education & Nonprofit (11%), Healthcare & Wellness (9%) and Home, Property & Local Services (9%). Manufacturing alone is the most common label, with 73 case studies.

Software and technology clients report the highest median traffic gain, at 64%. Only three groups have at least 20 traffic data points:

• Software & Technology: 64% (25% to 131%), 28 case studies
• Retail & Ecommerce: 57% (31% to 119%), 29 case studies
• Industrial & Manufacturing: 42% (24% to 106%), 48 case studies

Retail and ecommerce clients report a median 63% increase in revenue or sales. 43 case studies state one, with the middle half between 30% and 126%.

Manufacturers report a median 168% increase in conversions or leads. 20 case studies state one, with the middle half between 41% and 410%. No other group has 20 data points for leads.

Some industries rarely measure their sites. At least one measured result appears in 66% of Industrial & Manufacturing and Automotive case studies and 62% of Retail & Ecommerce ones, but only 40% of Financial Services and 37% of Education & Nonprofit ones.

Web development statistics by client size

Client size is the client's employee count. It is recorded for 375 of the 1,140 case studies (33%), so this section covers only those.

Small businesses are the largest client group, at 36%. Of the 375 with a known size, 136 involve small businesses (1 to 50 employees), 84 medium businesses (51 to 200), 65 large businesses (201 to 1,000) and 90 enterprises (more than 1,000).

The smaller the client, the larger the reported traffic gain. Median reported traffic gain by client size, with the middle half in brackets:

• Small (1 to 50 employees): 72% (32% to 118%), 75 case studies
• Medium (51 to 200): 57% (19% to 89%), 37 case studies
• Large (201 to 1,000): 37% (20% to 108%), 29 case studies

Enterprises have too few traffic data points to report.

Small businesses report a median 156% increase in revenue or sales. 29 case studies state one, with the middle half between 53% and 233%. Their median gain in conversions or leads is 120% (20 case studies). No other size has 20 data points for either.

Small businesses buy web development with SEO; enterprises buy it without. SEO is listed alongside in 70% of small-business case studies, 49% of medium, 40% of large and 8% of enterprise ones.

Web development statistics by country

Country is the client's location, not the agency's. It is recorded for 676 of the 1,140 case studies (59%), so this section covers only those.

76% of web development case studies are for US clients. 511 of the 676 located case studies are in the United States. The other 165 are spread across 28 countries and territories, led by the United Kingdom (56), Canada (32) and the United Arab Emirates (19).

US clients report a median 52% increase in traffic. 167 US case studies state one, with the middle half between 25% and 135%. The median gain is 124% in conversions or leads (66 case studies), 100% in revenue (67) and 48% in conversion rate (20).

Clients outside the US report a median 99% increase in traffic. 35 case studies state one, with the middle half between 55% and 125%. No single country outside the US has 20 data points.

California has the most web development case studies of any US state. 85 of the 511 are for California clients, followed by Texas (63), New York (51), Florida (33) and Massachusetts (32). The median reported traffic gain is 66% for California (40 case studies) and 44% for Texas (21).

How long a web development project takes: what the data can't tell you

None of the 1,140 case studies records how long the project took. Agencies don't state build time or how long after launch the results were measured, so we can't say how long a build takes to pay off.

Only 8% mention any time period at all. 92 case studies include a time reference somewhere in their result stats, such as "year over year" or "in 14 weeks". The other 92% give a result with no window.

If you're comparing agencies, ask when each number was measured. A revenue gain in the month after launch and the same gain a year later are different results.

The agencies behind the data

Three agencies publish 19% of the web development case studies. Coalition Technologies has 82, Wakefly 75 and GCC Marketing 56. Half the agencies have three or fewer.

One agency supplies a fifth of the traffic and revenue data. Coalition Technologies supplies 47 of the 226 traffic data points and 26 of the 115 revenue data points. Without it, the median traffic gain is 56% instead of 60%, and the median revenue gain 61% instead of 71%.

How much of this data is verified?

Only 5% of web development case studies are Client-verified. 53 of the 1,140, from 38 agencies, carry OpenServed's Client-verified badge, meaning the named client confirmed the results. The other 95% are agency-reported.

There are too few verified results to compare. No metric has 20 verified data points, so we can't say whether verified gains are higher or lower.

Keep this in mind with every number on this page. A published case study is an agency's best work, described in the agency's words. Without a client confirming it, it's a claim, not a benchmark.

What this means if you're hiring a web development agency

• Ask what the build achieved, not only what was built. 36% of web development case studies contain no number at all.
• Treat a 60% traffic gain as the typical published win, not a promise. Two in three case studies that report traffic stay under 100%, and these are the projects that went well.
• Ask for revenue or leads. Only 30% of web development case studies report a business outcome. For an online store, ask for revenue and conversion rate.
• Ask for speed before and after. Only 7% of case studies report page speed, though a faster site is one of the main reasons to rebuild.
• If you're migrating, ask what happened to traffic. Only 10% of migration case studies report traffic.
• Decide whether you need SEO too. Web development sold with SEO reports two to three times the traffic, lead and revenue gains, and is twice as likely to report a result at all.
• Ask whether the client confirmed it. Only 5% of web development case studies are Client-verified.

You can browse every case study behind these numbers in OpenServed's web development agency directory, and filter by industry, client size and location.

Methodology

• Source: all 1,140 case studies in OpenServed's directory that list Web Development as a service, as of November 3, 2026, from 128 agencies. Each links to the agency's own published case study.
• Result stats: each case study carries the result stats the agency published, as free text. We assigned each stat to a metric by keyword matching: traffic, keyword rankings, leads, conversions, conversion rate, revenue, bounce rate, time on site, pages per session, engagement rate, page speed and accessibility.
• Percentages only: medians use stats that state a percentage change. Plain counts, dollar figures and before-and-after pairs are left out, though they still count toward what case studies report. For page load time, a before-and-after pair in seconds is converted to a percentage cut.
• Reductions: load time and bounce rate are reported as reductions. Reductions of 100% or more are left out.
• Other channels excluded: stats that name paid media, ads, cost per acquisition, ROAS, email, Amazon or social media are not counted as web development results. That removes 5% of all stats. Organic and SEO stats are kept, because a new site affects search traffic.
• Ecommerce builds: case studies for retail and ecommerce clients, or whose results mention an online store, a commerce platform, orders, transactions or checkout.
• One data point per case study: if a case study has several stats for the same metric, we use the first one listed. Conversions and leads are combined, using whichever comes first.
• Median and middle half: we report the median, not the average, because a handful of gains above 1,000% would distort an average. The middle half is the range from the 25th to the 75th percentile.
• Minimum sample: we report a segment only when it has at least 20 data points for that metric.
• Missing details: client size is recorded for 33% of these case studies and location for 59%, so those sections cover only the case studies that have them.
• Bundled services: 87% of these case studies list other services alongside Web Development, most often Web Design and SEO. Results can't be attributed to development alone.
• Industry groups: we merged 117 industry labels into 13 groups for the roll-up figures. Client size uses employee count: small is 1 to 50, medium 51 to 200, large 201 to 1,000 and enterprise more than 1,000.
• Selection bias: agencies publish their wins, and the directory is not a random sample of the industry. Three agencies account for 19% of these case studies.
• Agency-reported: except for the 53 Client-verified case studies, results are as published by each agency and haven't been independently confirmed.

Cite this data: OpenServed, "Web Development Statistics 2026: Results From 1,100+ Agency Case Studies", November 2026, https://openserved.com/blog/web-development-statistics