Antithesis vs Gray Swan
Antithesis vs Gray Swan, compared side by side on 23 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: Antithesis is on 46/100 and Gray Swan on 63/100.
Where each one leads
Antithesis
- headcount: 198 against 81
- funding raised: $118M against $45.7M
Gray Swan
- our overall score: 63/100 against 46/100
At a glance
| Measure | Antithesis | Gray Swan |
|---|---|---|
| What it is | Antithesis is an autonomous software testing platform that finds the bugs others miss. | Gray Swan provides enterprise-grade security solutions for LLMs, developed by the pioneers of AI vulnerability research, enabling confident AI deployment. |
| Category | Cybersecurity, AI Infrastructure, Developer Tools, Vulnerability Management | Cybersecurity, AI Safety, AI Alignment, Large Language Model |
| Sells toBusiness model | B2B | B2B |
| Offering | Software | Software |
| Founded | 2021 | 2023 |
| Headquarters | San Francisco, United States | Pittsburgh, United States |
| Status | Active | Active |
Size, funding and growth
| Measure | Antithesis | Gray Swan |
|---|---|---|
| Employees | 198 | 81 |
| Headcount growthLast 12 months | +101.8% | Not published |
| Total funding | $118M | $45.7M |
| Latest round | Not published | Series A |
| Valuation | Not published | $200M |
| LinkedIn followers | 7,457 | 7,116 |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Antithesis | Gray Swan |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 46/100 | 63/100 |
| Traction | 60/100 | 57/100 |
| Team | 60/100 | 70/100 |
| Community | 15/100 | Not published |
| Search visibility | 22/100 | 23/100 |
| Quality | 40/100 | 72/100 |
| Agent readinessHow well an AI agent can read and act on the site | F (38/100) | F (39/100) |
| Domain ratingLink authority, 0-100 | 71/100 | 64/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Antithesis | Gray Swan |
|---|---|---|
| Hosting | AWS | Not detected |
| CDN | CloudFront | Cloudflare |
| CMS | Ghost | Webflow |
| Frameworks | Astro | Tailwind CSS |
| Analytics | Google Tag Manager | PostHog |
| Support stack | Not detected | HubSpot |
| Open source | Yes | No |
What users say
| Measure | Antithesis | Gray Swan |
|---|---|---|
| Reddit sentimentThreads we track | 1 positive, 0 negative across 1 thread | 5 positive, 0 negative across 5 threads |
“Antithesis - The Deterministic Computer. submitted by /u/Tybug2 to r/programming [link] [comments]”r/programming
“Gray Swan AI—where AI security meets the underground. This is the proving ground for red teamers, hackers, & AI skeptics pushing models to their limits. Jailbreak, exploit, & expose vulnerabilities in cutting-edge AI systems.”r/
Antithesis vs Gray Swan: common questions
Which is better, Antithesis or Gray Swan?
On our 0-100 score Gray Swan rates higher (63/100 against 46/100). 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 23 data points above: read the rows that match what you are buying for.
How do Antithesis and Gray Swan compare on the numbers?
Antithesis leads on headcount (198 against 81), funding raised ($118M against $45.7M). Gray Swan leads on our overall score (63/100 against 46/100).
What do real users say about Antithesis and Gray Swan?
Antithesis: 1 positive and 0 negative mentions across 1 Reddit threads we track, mostly in r/programming. Gray Swan: 5 positive and 0 negative mentions across 5 Reddit threads we track.
Read the full Antithesis review and pricing or the Gray Swan review and pricing. You can also browse other Antithesis alternatives we track.