ACAS VS Tenable
As of 4 November 2026, Tenable is named by 446 companies and ACAS by 373; ACAS skews to companies under 200 people (42% vs 34%), Tenable to companies over 1,000 (42% vs 27%).
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: ACAS's script and mail records show on hundreds of thousands of small sites, Tenable rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- ACAS: 2–200 employees
- 42%
- Tenable: 2–200 employees
- 34%
- ACAS: 1,000+ employees
- 27%
- Tenable: 1,000+ employees
- 42%
- Postings per company, 90 days
- 4.7 · 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 | ACAS | share | Tenable | share | Leans |
|---|---|---|---|---|---|
| Self-employed | 7 | 2% | 6 | 1% | even |
| 2-10 employees | 13 | 3% | 18 | 4% | even |
| 11-50 employees | 37 | 10% | 32 | 7% | ACAS |
| 51-200 employees | 108 | 29% | 101 | 23% | ACAS |
| 201-500 employees | 69 | 18% | 61 | 14% | ACAS |
| 501-1000 employees | 37 | 10% | 42 | 9% | even |
| 1001-5000 employees | 45 | 12% | 88 | 20% | Tenable |
| 5001-10000 employees | 17 | 5% | 26 | 6% | even |
| 10,001+ employees | 40 | 11% | 72 | 16% | Tenable |
| Segment | ACAS | share | Tenable | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 159 | 43% | 191 | 43% | even |
| Business & finance services | 95 | 25% | 95 | 21% | ACAS |
| Manufacturing & industry | 75 | 20% | 52 | 12% | ACAS |
| Public, community & associations | 11 | 3% | 15 | 3% | even |
| Consumer services & leisure | 9 | 2% | 14 | 3% | even |
| Property & construction | 7 | 2% | 8 | 2% | even |
| Media & content | 5 | 1% | 8 | 2% | even |
| Transport, logistics & rental | 5 | 1% | 7 | 2% | even |
| Commerce & trade | 3 | 1% | 19 | 4% | Tenable |
| Health care | 2 | 1% | – | – | outside top 12 |
| Hospitality & travel | 1 | 0% | 6 | 1% | even |
| Utilities & infrastructure | 1 | 0% | 17 | 4% | Tenable |
| Automotive | – | – | 7 | 2% | outside top 12 |
| Segment | ACAS | share | Tenable | share | Leans |
|---|---|---|---|---|---|
| United States | 325 | 87% | 299 | 67% | ACAS |
| United Kingdom | 18 | 5% | 22 | 5% | even |
| Canada | 6 | 2% | 14 | 3% | even |
| Spain | 3 | 1% | 4 | 1% | even |
| Switzerland | 2 | 1% | – | – | outside top 12 |
| Australia | 1 | 0% | 11 | 2% | Tenable |
| Czechia | 1 | 0% | – | – | outside top 12 |
| Germany | 1 | 0% | 14 | 3% | Tenable |
| Denmark | 1 | 0% | – | – | outside top 12 |
| France | 1 | 0% | 10 | 2% | even |
| Ireland | 1 | 0% | – | – | outside top 12 |
| India | 1 | 0% | 3 | 1% | even |
| Brazil | – | – | 8 | 2% | outside top 12 |
| Netherlands | – | – | 4 | 1% | outside top 12 |
| Singapore | – | – | 4 | 1% | outside top 12 |
| Belgium | – | – | 3 | 1% | outside top 12 |
| Segment | ACAS | share | Tenable | share | Leans |
|---|---|---|---|---|---|
| IT operations & business systems | 1,583 | 73% | 1,064 | 76% | Tenable |
| Finance & accounting | 115 | 5% | 2 | 0% | ACAS |
| Engineering (non-software) | 85 | 4% | 9 | 1% | ACAS |
| Software engineering | 58 | 3% | 66 | 5% | Tenable |
| Skilled trades and field service | 26 | 1% | – | – | outside top 12 |
| Product, program & project management | 21 | 1% | 15 | 1% | even |
| Legal, compliance & risk | 17 | 1% | 4 | 0% | even |
| Data & AI | 16 | 1% | 7 | 0% | even |
| Human resources | 15 | 1% | – | – | outside top 12 |
| Customer service & success | 7 | 0% | 14 | 1% | even |
| Education & training | 4 | 0% | – | – | outside top 12 |
| Facilities cleaning and security | 4 | 0% | 4 | 0% | even |
| Administration & office | 3 | 0% | – | – | outside top 12 |
| General management & consulting | 3 | 0% | 7 | 0% | even |
| Logistics warehouse and transport | 3 | 0% | – | – | outside top 12 |
| Unclassified | 3 | 0% | 2 | 0% | even |
| Manufacturing and production | 2 | 0% | – | – | outside top 12 |
| Social care and community | 2 | 0% | – | – | outside top 12 |
| Arts media and entertainment | 1 | 0% | – | – | outside top 12 |
| Business development & strategy | 1 | 0% | 5 | 0% | even |
| Procurement and purchasing | 1 | 0% | – | – | outside top 12 |
| Sales | – | – | 54 | 4% | outside top 12 |
| Marketing & communications | – | – | 10 | 1% | outside top 12 |
| Quality, safety & environment | – | – | 8 | 1% | outside top 12 |
| Construction and civil | – | – | 2 | 0% | outside top 12 |
| Design & UX | – | – | 1 | 0% | outside top 12 |
The companies behind each column
Companies using ACAS →
Companies using Tenable →
vulnerability management ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
Tenable is named by 446 companies in job postings and ACAS by 373; 84 name both. (Breaknorm, 4 November 2026, https://breaknorm.co/compare/acas-vs-tenable)
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.
ACAS vs Tenable: questions
Which is more used, ACAS or Tenable?
By companies naming it in their own job postings, Tenable (446) over ACAS (373). By website-and-DNS footprint, Tenable (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses ACAS?
42% of ACAS companies have 2 to 200 employees, against 34% for Tenable. 27% of ACAS companies have over 1,000 employees, against 42% for Tenable.
Do companies run both?
84 companies name both in their postings, usually ACAS in marketing and Tenable 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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with the person who owns it
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