OpenAPI VS XML Schema (XSD)
As of 30 October 2026, XML Schema (XSD) is named by 203 companies and OpenAPI by 1,052; OpenAPI skews to companies under 200 people (42% vs 44%), XML Schema (XSD) to companies over 1,000 (33% vs 36%).
As of 30 October 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: OpenAPI's script and mail records show on hundreds of thousands of small sites, XML Schema (XSD) rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- OpenAPI: 2–200 employees
- 42%
- XML Schema (XSD): 2–200 employees
- 44%
- OpenAPI: 1,000+ employees
- 36%
- XML Schema (XSD): 1,000+ employees
- 33%
- Postings per company, 90 days
- 2.5 · 2.1
- 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 | OpenAPI | share | XML Schema (XSD) | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 12 | 1% | 2 | 1% | even |
| 2-10 employees | 60 | 6% | 9 | 4% | even |
| 11-50 employees | 154 | 15% | 44 | 22% | XML Schema (XSD) |
| 51-200 employees | 225 | 21% | 36 | 18% | OpenAPI |
| 201-500 employees | 138 | 13% | 22 | 11% | OpenAPI |
| 501-1000 employees | 88 | 8% | 23 | 11% | XML Schema (XSD) |
| 1001-5000 employees | 189 | 18% | 40 | 20% | even |
| 5001-10000 employees | 56 | 5% | 9 | 4% | even |
| 10,001+ employees | 130 | 12% | 18 | 9% | OpenAPI |
| Segment | OpenAPI | share | XML Schema (XSD) | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 561 | 53% | 128 | 63% | XML Schema (XSD) |
| Business & finance services | 258 | 25% | 36 | 18% | OpenAPI |
| Manufacturing & industry | 63 | 6% | 13 | 6% | even |
| Media & content | 28 | 3% | 2 | 1% | even |
| Utilities & infrastructure | 26 | 2% | 4 | 2% | even |
| Commerce & trade | 18 | 2% | 4 | 2% | even |
| Health care | 18 | 2% | 1 | 0% | even |
| Consumer services & leisure | 16 | 2% | 2 | 1% | even |
| Transport, logistics & rental | 16 | 2% | 6 | 3% | even |
| Automotive | 15 | 1% | 2 | 1% | even |
| Public, community & associations | 12 | 1% | 4 | 2% | even |
| Property & construction | 11 | 1% | 1 | 0% | even |
| Segment | OpenAPI | share | XML Schema (XSD) | share | Leans |
|---|---|---|---|---|---|
| United States | 539 | 51% | 122 | 60% | XML Schema (XSD) |
| United Kingdom | 95 | 9% | 20 | 10% | even |
| Germany | 67 | 6% | 5 | 2% | OpenAPI |
| France | 48 | 5% | 4 | 2% | OpenAPI |
| Canada | 29 | 3% | 3 | 1% | even |
| Switzerland | 28 | 3% | – | – | outside top 12 |
| India | 25 | 2% | 5 | 2% | even |
| Poland | 22 | 2% | 7 | 3% | even |
| Spain | 19 | 2% | 3 | 1% | even |
| Brazil | 18 | 2% | – | – | outside top 12 |
| Australia | 16 | 2% | – | – | outside top 12 |
| Netherlands | 12 | 1% | – | – | outside top 12 |
| United Arab Emirates | – | – | 4 | 2% | outside top 12 |
| Czechia | – | – | 4 | 2% | outside top 12 |
| Denmark | – | – | 3 | 1% | outside top 12 |
| Italy | – | – | 3 | 1% | outside top 12 |
| Segment | OpenAPI | share | XML Schema (XSD) | share | Leans |
|---|---|---|---|---|---|
| Software engineering | 2,250 | 67% | 558 | 63% | OpenAPI |
| IT operations & business systems | 271 | 8% | 111 | 12% | XML Schema (XSD) |
| Data & AI | 204 | 6% | 39 | 4% | even |
| Product, program & project management | 94 | 3% | 14 | 2% | even |
| Arts media and entertainment | 43 | 1% | 1 | 0% | even |
| Engineering (non-software) | 29 | 1% | 11 | 1% | even |
| Sales | 22 | 1% | 3 | 0% | even |
| Customer service & success | 16 | 0% | 5 | 1% | even |
| Quality, safety & environment | 8 | 0% | – | – | outside top 12 |
| Legal, compliance & risk | 4 | 0% | – | – | outside top 12 |
| Construction and civil | 3 | 0% | 1 | 0% | even |
| Design & UX | 3 | 0% | – | – | outside top 12 |
| Finance & accounting | – | – | 4 | 0% | outside top 12 |
| Human resources | – | – | 4 | 0% | outside top 12 |
| Research and science | – | – | 2 | 0% | outside top 12 |
The companies behind each column
Companies using OpenAPI →
Companies using XML Schema (XSD) →
api specs data formats ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
XML Schema (XSD) is named by 203 companies in job postings and OpenAPI by 1,052; 0 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/openapi-vs-xml-schema)
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.
OpenAPI vs XML Schema (XSD): questions
Which is more used, OpenAPI or XML Schema (XSD)?
By companies naming it in their own job postings, OpenAPI (1,052) over XML Schema (XSD) (203). By website-and-DNS footprint, XML Schema (XSD) (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses OpenAPI?
42% of OpenAPI companies have 2 to 200 employees, against 44% for XML Schema (XSD). 36% of OpenAPI companies have over 1,000 employees, against 33% for XML Schema (XSD).
Do companies run both?
0 companies name both in their postings, usually OpenAPI in marketing and XML Schema (XSD) 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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