Aspen HYSYS VS CAESAR II
As of 30 October 2026, CAESAR II is named by 131 companies and Aspen HYSYS by 186; Aspen HYSYS skews to companies under 200 people (32% vs 27%), CAESAR II to companies over 1,000 (39% vs 43%).
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: Aspen HYSYS's script and mail records show on hundreds of thousands of small sites, CAESAR II rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- Aspen HYSYS: 2–200 employees
- 32%
- CAESAR II: 2–200 employees
- 27%
- Aspen HYSYS: 1,000+ employees
- 43%
- CAESAR II: 1,000+ employees
- 39%
- Postings per company, 90 days
- 2.3 · 2.7
- 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 | Aspen HYSYS | share | CAESAR II | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 3 | 2% | 3 | 2% | even |
| 2-10 employees | 13 | 7% | 8 | 6% | even |
| 11-50 employees | 21 | 11% | 12 | 9% | Aspen HYSYS |
| 51-200 employees | 26 | 14% | 16 | 12% | even |
| 201-500 employees | 29 | 16% | 22 | 17% | even |
| 501-1000 employees | 14 | 8% | 19 | 15% | CAESAR II |
| 1001-5000 employees | 36 | 19% | 17 | 13% | Aspen HYSYS |
| 5001-10000 employees | 10 | 5% | 12 | 9% | CAESAR II |
| 10,001+ employees | 34 | 18% | 22 | 17% | even |
| Segment | Aspen HYSYS | share | CAESAR II | share | Leans |
|---|---|---|---|---|---|
| Business & finance services | 65 | 35% | 65 | 50% | CAESAR II |
| Manufacturing & industry | 48 | 26% | 27 | 21% | Aspen HYSYS |
| Utilities & infrastructure | 39 | 21% | 18 | 14% | Aspen HYSYS |
| Technology & software | 11 | 6% | 3 | 2% | Aspen HYSYS |
| Property & construction | 8 | 4% | 10 | 8% | CAESAR II |
| Consumer services & leisure | 6 | 3% | – | – | outside top 12 |
| Media & content | 3 | 2% | 2 | 2% | even |
| Automotive | 2 | 1% | 2 | 2% | even |
| Agriculture & forestry | 1 | 1% | – | – | outside top 12 |
| Commerce & trade | 1 | 1% | 3 | 2% | even |
| Public, community & associations | 1 | 1% | 1 | 1% | even |
| Health care | 1 | 1% | – | – | outside top 12 |
| Segment | Aspen HYSYS | share | CAESAR II | share | Leans |
|---|---|---|---|---|---|
| United States | 110 | 59% | 79 | 60% | even |
| United Kingdom | 12 | 6% | 8 | 6% | even |
| Canada | 11 | 6% | 8 | 6% | even |
| France | 11 | 6% | 9 | 7% | even |
| India | 9 | 5% | 5 | 4% | even |
| Germany | 5 | 3% | 3 | 2% | even |
| Spain | 4 | 2% | – | – | outside top 12 |
| Norway | 4 | 2% | – | – | outside top 12 |
| Brazil | 3 | 2% | 3 | 2% | even |
| ID | 2 | 1% | – | – | outside top 12 |
| NG | 2 | 1% | – | – | outside top 12 |
| United Arab Emirates | 1 | 1% | 4 | 3% | CAESAR II |
| Australia | – | – | 3 | 2% | outside top 12 |
| Belgium | – | – | 2 | 2% | outside top 12 |
| Austria | – | – | 1 | 1% | outside top 12 |
| AZ | – | – | 1 | 1% | outside top 12 |
| Segment | Aspen HYSYS | share | CAESAR II | share | Leans |
|---|---|---|---|---|---|
| Engineering (non-software) | 467 | 77% | 460 | 93% | CAESAR II |
| Product, program & project management | 11 | 2% | 1 | 0% | even |
| Quality, safety & environment | 11 | 2% | 1 | 0% | even |
| Research and science | 10 | 2% | – | – | outside top 12 |
| General management & consulting | 7 | 1% | – | – | outside top 12 |
| Sales | 6 | 1% | 1 | 0% | even |
| Customer service & success | 5 | 1% | – | – | outside top 12 |
| Education & training | 5 | 1% | – | – | outside top 12 |
| Manufacturing and production | 4 | 1% | – | – | outside top 12 |
| IT operations & business systems | 2 | 0% | 2 | 0% | even |
| Unclassified | 2 | 0% | – | – | outside top 12 |
| Administration & office | 1 | 0% | – | – | outside top 12 |
| Skilled trades and field service | – | – | 4 | 1% | outside top 12 |
| Construction and civil | – | – | 3 | 1% | outside top 12 |
| Data & AI | – | – | 2 | 0% | outside top 12 |
| Software engineering | – | – | 1 | 0% | outside top 12 |
The companies behind each column
Companies using Aspen HYSYS →
Companies using CAESAR II →
cae simulation ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
CAESAR II is named by 131 companies in job postings and Aspen HYSYS by 186; 6 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/aspen-hysys-vs-caesar-ii)
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.
Aspen HYSYS vs CAESAR II: questions
Which is more used, Aspen HYSYS or CAESAR II?
By companies naming it in their own job postings, Aspen HYSYS (186) over CAESAR II (131). By website-and-DNS footprint, CAESAR II (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses Aspen HYSYS?
32% of Aspen HYSYS companies have 2 to 200 employees, against 27% for CAESAR II. 43% of Aspen HYSYS companies have over 1,000 employees, against 39% for CAESAR II.
Do companies run both?
6 companies name both in their postings, usually Aspen HYSYS in marketing and CAESAR II 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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