Apache Tomcat VS Microsoft IIS
As of 4 November 2026, Microsoft IIS is named by 1,292 companies and Apache Tomcat by 1,121; Apache Tomcat skews to companies under 200 people (48% vs 41%), Microsoft IIS to companies over 1,000 (34% vs 30%).
As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: Apache Tomcat's script and mail records show on hundreds of thousands of small sites, Microsoft IIS rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- Apache Tomcat: 2–200 employees
- 48%
- Microsoft IIS: 2–200 employees
- 41%
- Apache Tomcat: 1,000+ employees
- 30%
- Microsoft IIS: 1,000+ employees
- 34%
- Postings per company, 90 days
- 2.0 · 1.9
- Website or DNS footprint
- 0 · 0
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | Apache Tomcat | share | Microsoft IIS | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 23 | 2% | 21 | 2% | even |
| 2-10 employees | 70 | 6% | 73 | 6% | even |
| 11-50 employees | 192 | 17% | 191 | 15% | Apache Tomcat |
| 51-200 employees | 280 | 25% | 265 | 21% | Apache Tomcat |
| 201-500 employees | 137 | 12% | 187 | 14% | Microsoft IIS |
| 501-1000 employees | 84 | 7% | 120 | 9% | even |
| 1001-5000 employees | 158 | 14% | 209 | 16% | Microsoft IIS |
| 5001-10000 employees | 46 | 4% | 63 | 5% | even |
| 10,001+ employees | 131 | 12% | 163 | 13% | even |
| Segment | Apache Tomcat | share | Microsoft IIS | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 675 | 60% | 645 | 50% | Apache Tomcat |
| Business & finance services | 237 | 21% | 276 | 21% | even |
| Manufacturing & industry | 43 | 4% | 116 | 9% | Microsoft IIS |
| Consumer services & leisure | 34 | 3% | 34 | 3% | even |
| Media & content | 26 | 2% | 26 | 2% | even |
| Utilities & infrastructure | 24 | 2% | 30 | 2% | even |
| Public, community & associations | 22 | 2% | 48 | 4% | even |
| Commerce & trade | 15 | 1% | 29 | 2% | even |
| Transport, logistics & rental | 14 | 1% | 22 | 2% | even |
| Property & construction | 10 | 1% | 18 | 1% | even |
| Hospitality & travel | 8 | 1% | – | – | outside top 12 |
| Health care | 7 | 1% | 28 | 2% | even |
| Automotive | – | – | 11 | 1% | outside top 12 |
| Segment | Apache Tomcat | share | Microsoft IIS | share | Leans |
|---|---|---|---|---|---|
| United States | 581 | 52% | 739 | 57% | Microsoft IIS |
| France | 77 | 7% | 57 | 4% | Apache Tomcat |
| Germany | 68 | 6% | 45 | 3% | Apache Tomcat |
| India | 56 | 5% | 37 | 3% | Apache Tomcat |
| United Kingdom | 45 | 4% | 63 | 5% | even |
| Canada | 22 | 2% | 40 | 3% | even |
| Italy | 21 | 2% | 23 | 2% | even |
| Poland | 14 | 1% | 15 | 1% | even |
| Spain | 13 | 1% | 15 | 1% | even |
| Belgium | 12 | 1% | 13 | 1% | even |
| Brazil | 12 | 1% | 21 | 2% | even |
| Switzerland | 12 | 1% | – | – | outside top 12 |
| Australia | – | – | 14 | 1% | outside top 12 |
| Segment | Apache Tomcat | share | Microsoft IIS | share | Leans |
|---|---|---|---|---|---|
| Software engineering | 2,580 | 58% | 1,328 | 33% | Apache Tomcat |
| IT operations & business systems | 937 | 21% | 1,417 | 35% | Microsoft IIS |
| Engineering (non-software) | 98 | 2% | 137 | 3% | even |
| Data & AI | 53 | 1% | 116 | 3% | even |
| Customer service & success | 52 | 1% | 193 | 5% | Microsoft IIS |
| Product, program & project management | 50 | 1% | 67 | 2% | even |
| Administration & office | 11 | 0% | 7 | 0% | even |
| Sales | 9 | 0% | 50 | 1% | even |
| Quality, safety & environment | 8 | 0% | 6 | 0% | even |
| Unclassified | 8 | 0% | 5 | 0% | even |
| General management & consulting | 4 | 0% | 15 | 0% | even |
| Construction and civil | 3 | 0% | – | – | outside top 12 |
| Marketing & communications | 3 | 0% | 9 | 0% | even |
| Skilled trades and field service | 3 | 0% | 7 | 0% | even |
| Human resources | 2 | 0% | 3 | 0% | even |
| Retail & store operations | 2 | 0% | 2 | 0% | even |
| Arts media and entertainment | 1 | 0% | 4 | 0% | even |
| Design & UX | 1 | 0% | 2 | 0% | even |
| Education & training | 1 | 0% | 3 | 0% | even |
| Finance & accounting | 1 | 0% | 7 | 0% | even |
| Legal, compliance & risk | 1 | 0% | 11 | 0% | even |
| Logistics warehouse and transport | 1 | 0% | 4 | 0% | even |
| Manufacturing and production | 1 | 0% | 5 | 0% | even |
| Research and science | – | – | 27 | 1% | outside top 12 |
| Healthcare support and caregiving | – | – | 7 | 0% | outside top 12 |
| Business development & strategy | – | – | 4 | 0% | outside top 12 |
| Healthcare clinical | – | – | 2 | 0% | outside top 12 |
| Social care and community | – | – | 2 | 0% | outside top 12 |
| Hospitality and food service | – | – | 1 | 0% | outside top 12 |
The companies behind each column
Companies using Apache Tomcat →
Companies using Microsoft IIS →
web app servers ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
Microsoft IIS is named by 1,292 companies in job postings and Apache Tomcat by 1,121; 286 name both. (Breaknorm, 4 November 2026, https://breaknorm.co/compare/apache-tomcat-vs-microsoft-iis)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
Apache Tomcat vs Microsoft IIS: questions
Which is more used, Apache Tomcat or Microsoft IIS?
By companies naming it in their own job postings, Microsoft IIS (1,292) over Apache Tomcat (1,121). By website-and-DNS footprint, Microsoft IIS (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses Apache Tomcat?
48% of Apache Tomcat companies have 2 to 200 employees, against 41% for Microsoft IIS. 30% of Apache Tomcat companies have over 1,000 employees, against 34% for Microsoft IIS.
Do companies run both?
286 companies name both in their postings, usually Apache Tomcat in marketing and Microsoft IIS in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
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