Onyx Security vs Sema4.ai
Onyx Security vs Sema4.ai, compared side by side on 18 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Onyx Security is on 63/100 and Sema4.ai on 51/100.
Where each one leads
Onyx Security
- our overall score: 63/100 against 51/100
- headcount: 98 against 45
- funding raised: $158M against $80.0M
Sema4.ai
- domain rating: 61/100 against 44/100
At a glance
| Measure | Onyx Security | Sema4.ai |
|---|---|---|
| What it is | A secure AI control plane platform for discovering, monitoring, and governing enterprise AI agents. | Enterprise AI agent platform for building, operating, and scaling secure AI agents to automate complex business processes. |
| Category | AI Governance, AI Observability, Cybersecurity, Agentic AI | Agentic AI, Customer Service, AI Agents, AI Agent |
| Sells toBusiness model | B2B | B2B |
| Offering | Platform | Platform |
| Founded | 2024 | 2023 |
| Headquarters | Tel Aviv, Israel | San Francisco, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Onyx Security | Sema4.ai |
|---|---|---|
| Employees | 98 | 45 |
| Headcount growthLast 12 months | +75.5% | Not published |
| Open roles | 11 | Not published |
| Total funding | $158M | $80.0M |
| Latest round | Series B | Seed |
| Valuation | $640M | Not published |
| LinkedIn followers | 5,381 | 5,496 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Onyx Security | Sema4.ai |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 63/100 | 51/100 |
| Traction | 60/100 | 56/100 |
| Team | 80/100 | Not published |
| Community | 42/100 | Not published |
| Search visibility | 77/100 | 59/100 |
| Quality | 58/100 | 58/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (50/100) | D (46/100) |
| Domain ratingLink authority, 0-100 | 44/100 | 61/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Onyx Security | Sema4.ai |
|---|---|---|
| CDN | Cloudflare | Cloudflare |
| CMS | Webflow | Not detected |
| Frameworks | Bootstrap | Not detected |
| Analytics | Google Analytics 4, Google Tag Manager | Not detected |
| Support stack | HubSpot | Not detected |
Product and pricing
| Measure | Onyx Security | Sema4.ai |
|---|---|---|
| Key features | Not published | Enterprise AI Agent Platform, Studio & SDK, Control Room, Work Room, Document Intelligence, Flexible Deployment |
What users say
| Measure | Onyx Security | Sema4.ai |
|---|---|---|
| Community ratingVisitor votes on StartupHub | 2.1/5 from 7 votes | Not published |
| Reddit sentimentThreads we track | 2 positive, 0 negative across 2 threads | Not published |
“Onyx Security raises $113 million for AI agent control plane.”r/RuntimeWire
Onyx Security vs Sema4.ai: common questions
Which is better, Onyx Security or Sema4.ai?
On our 0-100 score Onyx Security rates higher (63/100 against 51/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 18 data points above: read the rows that match what you are buying for.
How do Onyx Security and Sema4.ai compare on the numbers?
Onyx Security leads on our overall score (63/100 against 51/100), headcount (98 against 45), funding raised ($158M against $80.0M). Sema4.ai leads on domain rating (61/100 against 44/100).
What do real users say about Onyx Security and Sema4.ai?
Onyx Security: 2 positive and 0 negative mentions across 2 Reddit threads we track, mostly in r/RuntimeWire.
Read the full Onyx Security review and pricing or the Sema4.ai review and pricing. You can also browse other Onyx Security alternatives we track.