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Nebula Security logo

Nebula Security

YCombinator

Our AI agent finds vulnerabilities that Mythos can't

Nebula 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, Black Hat speakers, and PhD in cybersecurity. We have won $400K in bug bounties by exploiting the Linux kernel and Chrome browser. “Audited by Nebula Security” is a mark of serious security credibility: a signal to customers, investors, and partners that your product has been reviewed by the world’s best hackers.

Vancouver, WASummer 2026ActiveArtificial IntelligenceCybersecurity
NebuSec logo

NebuSec

YCombinator

Autonomous AI defense system for cyber attack

NebuSec is founded by the world’s #1 hacking team. 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, Black Hat speakers, and PhD in cybersecurity. We have won $400K in bug bounties by exploiting the Linux kernel and Chrome browser. “Audited by NebuSec” is a mark of serious security credibility: a signal to customers, investors, and partners that your product has been reviewed by the world’s best hackers.

B2BSan FranciscoArtificial IntelligenceB2BSecurityCybersecurityEnterprise
Nectar logo

Nectar

YCombinator

Manage energy cost & usage with AI for facility & sustainability teams

Nectar is the modern AI energy management platform. We automate utility data analysis to optimize energy costs, manage buildings, and report energy efficiency metrics for energy and sustainability teams. Our utility data API uses in-house AI agents to deliver the most accurate granular usage and cost data on the market.

IndustrialsSan Francisco
Neodocs logo

Neodocs

YCombinator

Instant lab tests on your smartphone

Neodocs lets you perform instant lab tests on your smartphone. Our users are health optimizers and athletes who want to improve key nutritional markers for better performance. You simply collect your sample, take a picture, and results are instantly generated. We are the perfect team to build this. Anurag is a 3-time medical entrepreneur who’s built medical devices, Pratik has worked on AI/ML models for leading US banks, and Nikunj comes from a consulting background at Bain & Co. We’re building your personal lab on your phone.

HealthcareIndiaArtificial IntelligenceConsumer Health ServicesMedical Devices
Neomatter logo

Neomatter

YCombinator

AI that works for in-house legal teams

Neomatter connects to a company’s email, chat, and business systems and does the legal work before it reaches the legal team. It gathers context, applies company policies and past decisions, and presents the completed work to in-house counsel for approval.

B2BSan FranciscoSaaSB2BLegal
neoncoral logo

neoncoral

YCombinator

No description available.

ConsumerSan FranciscoArtificial IntelligenceConsumerSocial MediaSocial
Neosync logo

Neosync

YCombinator

Neosync is an open-source anonymization and synthetic data platform.

Neosync is an open-source platform that allows you to create anonymized or synthetic data and sync it across all environments for testing and machine learning. Companies in highly regulated industries such as FinTech, HealthTech, InsureTech and those with sensitive data can use Neosync to create production-like data to use for debugging and building features in lower-level environments without the security and privacy risk of using production data.

B2BSan FranciscoDeveloper ToolsSaaSB2B
NeoWize logo

NeoWize

YCombinator

NeoWize created a new type of machine learning algorithm and uses it…

NeoWize changes the way we look at machine learning and deep learning. Current deep learning algorithms focus on making the most out of the data available. NeoWize utilizes neural networks and adaptive input to create more data and better data, thus increasing our predictive power with small data-sets. We use this technology to help e-commerce sites learn what each individual buyer is looking for and create a better user experience from the first visit.

B2BTel Aviv-Yafo, IsraelMachine LearningE-CommercePersonalization
Nephrogen logo

Nephrogen

YCombinator

Curative genetic medicines for kidney diseases

Nephrogen is a Stanford biotech spin-out developing curative genetic medicines for kidney and pancreatic diseases. Kidney disease alone affects 1 in 7 Americans, and neither indication has any approved gene-based therapies. Nephrogen's underlying platform combines AI and high-throughput screening to engineer safer, more efficient, and less expensive gene delivery vehicles for reaching the kidney and pancreas, and has attracted non-dilutive funding from seven major pharmaceutical companies including Merck KGaA, Novartis, and Bristol Myers Squibb.

HealthcareNew York City, NYGene TherapyCRISPRBiotech
Neptune.io logo

Neptune.io

YCombinator

A self-healing platform to enrich and fix server alerts automatically

Neptune is an observability startup that offers one-stop incident enrichment and automation platform for IT Operations and DevOps teams. It is a fact of life that servers and applications go down causing IT outages. Today most of the IT incident response is manual, tedious and lengthy resulting in more downtime and losses for businesses. At the same it's very painful for a DevOps engineer to wake up at midnight and on weekends to deal with server and application alerts. Enter Neptune, which lets a DevOps engineer automate his incident response steps --Troubleshooting + Resolution + Documentation, so that he/she can fix the incidents in minutes instead of hours. So it's a win-win deal : For businesses downtime is minimized, and for DevOps engineers they need not worry about a deluge of alerts and midnight wake up calls. Big companies like Amazon, Facebook etc built sophisticated incident response tools to achieve high availability and resiliency. We have architected and built one such tool for AWS. Now Neptune is making one such tool available for everyone. Give it a try at www.neptune.io

B2BSan FranciscoAIOpsDevOpsMonitoring
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