Fabraix
Fabraix builds state-of-the-art AI red-teaming agents that continuously detect security vulnerabilities in customer-facing AI. Our product, Nyx, has already found vulnerabilities in agents at dozens of Fortune 500 companies. On AgentHarm, the leading benchmark for offensive AI security, Nyx achieved a 78% attack success rate, compared with 67% for GPT-5.6 Sol. Companies usually pay for penetration tests one project at a time. They select which systems to include, give a team a few weeks to find
Y Combinator
yc-company-directory #3123Fabraix builds state-of-the-art AI red-teaming agents that continuously detect security vulnerabilities in customer-facing AI. Our product, Nyx, has already found vulnerabilities in agents at dozens of Fortune 500 companies. On AgentHarm, the leading benchmark for offensive AI security, Nyx achieved a 78% attack success rate, compared with 67% for GPT-5.6 Sol. Companies usually pay for penetration tests one project at a time. They select which systems to include, give a team a few weeks to find
sourceFabraix is classified as AI agents from source descriptions and fund-directory context. Similar companies below are ranked from offline product facets and meaningful description overlap; category and source affiliation can only strengthen an existing product match. For lookup-created rows, the profile starts as pending enrichment until deeper source collection runs.
Local clusters rerank extracted product concepts and description terms. The generated graph remains the fallback for sparse descriptions: offline reciprocal product-similarity graph: extracted concepts + description terms + bounded category/affiliation boosts. Minimum fallback score: 0; max competitors: 6.
Companies similar to Fabraix
A deterministic local cluster built from offline product facets and meaningful description terms. Category and selected-institution affiliation provide bounded tie-breaks. Open any peer to continue exploring its cluster.
Casco
match 82Casco performs autonomous security testing for your web apps, APIs, infrastructure, and AI systems. Human supervision optionally available. Use Casco for year-round security and get a penetration test report for your SOC2 and ISO27001 compliance certifications. Trusted by 100+ companies from enterprises to fast-moving startups, such as Gusto, CrewAI, Novig, and Accrual. Hack yourself at: https://casco.com --- We already secure software deployed in 60% of Fortune 500 companies and are default ali
shared extracted concepts: fortune 500 companies; shared product terms: security, test, system, penetration; shared product theme: security and compliance; shared affiliation: Y Combinator
Svix
match 79Svix is the enterprise ready and open source webhooks service. Webhooks are a pain. Developers need to worry about deliverability, retries, monitoring and security. All of which are different for webhooks compared to the rest of the stack. We turn all of that into a simple API call. Svix is sending billions of webhooks for customers both large (Fortune 500) and small (startups), and is backed by Y Combinator, Andreessen Horowitz (a16z), Aleph, and founders and CTOs of companies such as Github, P
shared extracted concept terms: fortune, 500; shared product terms: security, customer, fortune, 500; shared product theme: sales and marketing, security and compliance; shared affiliation: Y Combinator
Cignara
match 71Cignara automates the entire revenue cycle - sales and support - across voice and chat - for Fortune 500-scale companies. Companies like LG love us because of our ability to take personalized, agentic actions within their legacy IT systems, in a way that actively drives revenue increases (not just delivers CSAT).
shared extracted concept terms: fortune, 500, companie; shared product terms: fortune, 500, companie, system; shared product theme: sales and marketing; same category: AI agents; shared affiliation: Y Combinator
Prayas Analytics
match 67Prayas Anaytics helped retailers A/B test their stores, the way eCommerce companies A/B test their websites. We did this by continuously collecting data on customer movement using existing security cameras already in a retailer's stores. We were a Y Combinator backed company (S15) and worked with several retailers including Barneys, Payomatic, and multiple Fortune 200 retailers.
shared product terms: continuously, security, customer, already; shared product theme: sales and marketing, security and compliance; shared affiliation: Y Combinator
CellChorus
match 64At CellChorus, we apply artificial intelligence to evaluate thousands of microscopy videos in parallel to evaluate how immune cells move, interact and perform over time. This allows our customers to discover, develop, manufacture and deliver cell therapies, antibodies, vaccines and other novel therapies faster, at lower expense, and with higher rates of success. Our customers include top-25 biopharma companies and seed-stage biotechs that are developing cell therapies, antibody therapeutics and
shared extracted concept terms: companie; shared product terms: time, customer, rate, succes; shared product theme: sales and marketing; shared affiliation: Y Combinator
Nebula Security
match 57Nebula Security is an AI-native cybersecurity company founded by world-class hackers. Nebula Security provides Mythos-level cybersecurity reviews and product security auditing, conducted by our state-of-the-art AI agent and world-class hackers themselves, covering everything from code-level vulnerabilities to architectural weak points. We were the first team to build an nginx RCE and the first to root Android 17. Our co-founders include members of the world’s No. 1 CTF team, DEF CON winners, Bla
shared product terms: state, art, security, vulnerabilitie; shared product theme: security and compliance; same category: AI agents; shared affiliation: Y Combinator