CentOS VS IBM AIX
As of 30 October 2026, IBM AIX is named by 242 companies and CentOS by 564; CentOS skews to companies under 200 people (50% vs 36%), IBM AIX to companies over 1,000 (41% vs 25%).
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: CentOS's script and mail records show on hundreds of thousands of small sites, IBM AIX rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- CentOS: 2–200 employees
- 50%
- IBM AIX: 2–200 employees
- 36%
- CentOS: 1,000+ employees
- 25%
- IBM AIX: 1,000+ employees
- 41%
- Postings per company, 90 days
- 2.4 · 2.9
- 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 | CentOS | share | IBM AIX | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 6 | 1% | 3 | 1% | even |
| 2-10 employees | 36 | 6% | 8 | 3% | CentOS |
| 11-50 employees | 105 | 19% | 34 | 14% | CentOS |
| 51-200 employees | 142 | 25% | 44 | 18% | CentOS |
| 201-500 employees | 75 | 13% | 35 | 14% | even |
| 501-1000 employees | 57 | 10% | 19 | 8% | CentOS |
| 1001-5000 employees | 62 | 11% | 39 | 16% | IBM AIX |
| 5001-10000 employees | 18 | 3% | 18 | 7% | IBM AIX |
| 10,001+ employees | 63 | 11% | 42 | 17% | IBM AIX |
| Segment | CentOS | share | IBM AIX | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 318 | 56% | 114 | 47% | CentOS |
| Business & finance services | 85 | 15% | 60 | 25% | IBM AIX |
| Manufacturing & industry | 66 | 12% | 19 | 8% | CentOS |
| Utilities & infrastructure | 21 | 4% | 5 | 2% | even |
| Media & content | 16 | 3% | 2 | 1% | CentOS |
| Public, community & associations | 13 | 2% | 8 | 3% | even |
| Consumer services & leisure | 13 | 2% | 6 | 2% | even |
| Commerce & trade | 9 | 2% | 9 | 4% | IBM AIX |
| Property & construction | 7 | 1% | 1 | 0% | even |
| Health care | 5 | 1% | 13 | 5% | IBM AIX |
| Automotive | 4 | 1% | 2 | 1% | even |
| Transport, logistics & rental | 4 | 1% | 3 | 1% | even |
| Segment | CentOS | share | IBM AIX | share | Leans |
|---|---|---|---|---|---|
| United States | 321 | 57% | 131 | 54% | CentOS |
| United Kingdom | 38 | 7% | 11 | 5% | CentOS |
| France | 33 | 6% | 24 | 10% | IBM AIX |
| India | 25 | 4% | 3 | 1% | CentOS |
| Germany | 22 | 4% | 13 | 5% | even |
| Singapore | 12 | 2% | 5 | 2% | even |
| Netherlands | 10 | 2% | – | – | outside top 12 |
| Canada | 8 | 1% | 15 | 6% | IBM AIX |
| Italy | 8 | 1% | 5 | 2% | even |
| Poland | 8 | 1% | – | – | outside top 12 |
| Japan | 6 | 1% | – | – | outside top 12 |
| Spain | 5 | 1% | 3 | 1% | even |
| Portugal | – | – | 3 | 1% | outside top 12 |
| United Arab Emirates | – | – | 2 | 1% | outside top 12 |
| Argentina | – | – | 2 | 1% | outside top 12 |
| Segment | CentOS | share | IBM AIX | share | Leans |
|---|---|---|---|---|---|
| IT operations & business systems | 935 | 46% | 729 | 50% | IBM AIX |
| Software engineering | 609 | 30% | 251 | 17% | CentOS |
| Engineering (non-software) | 110 | 5% | 47 | 3% | CentOS |
| Customer service & success | 67 | 3% | 6 | 0% | CentOS |
| Data & AI | 21 | 1% | 26 | 2% | even |
| Product, program & project management | 13 | 1% | 29 | 2% | even |
| Sales | 10 | 0% | 15 | 1% | even |
| Quality, safety & environment | 6 | 0% | – | – | outside top 12 |
| Marketing & communications | 5 | 0% | – | – | outside top 12 |
| Education & training | 4 | 0% | – | – | outside top 12 |
| Administration & office | 3 | 0% | 6 | 0% | even |
| General management & consulting | 2 | 0% | 5 | 0% | even |
| Skilled trades and field service | – | – | 7 | 0% | outside top 12 |
| Finance & accounting | – | – | 6 | 0% | outside top 12 |
| Human resources | – | – | 4 | 0% | outside top 12 |
The companies behind each column
Companies using CentOS →
Companies using IBM AIX →
linux unix ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
IBM AIX is named by 242 companies in job postings and CentOS by 564; 0 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/centos-vs-ibm-aix)
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.
CentOS vs IBM AIX: questions
Which is more used, CentOS or IBM AIX?
By companies naming it in their own job postings, CentOS (564) over IBM AIX (242). By website-and-DNS footprint, IBM AIX (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses CentOS?
50% of CentOS companies have 2 to 200 employees, against 36% for IBM AIX. 25% of CentOS companies have over 1,000 employees, against 41% for IBM AIX.
Do companies run both?
0 companies name both in their postings, usually CentOS in marketing and IBM AIX 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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