Discover the next generation of startups.

KelAI

YCombinator

The AI Quant: Autonomous Alpha Engine for Funds and Traders.

Founded by former WorldQuant portfolio manager & head of event driven systematic strategies Jeremie Cohen, KelAI is building the autonomous alpha engine for hedge funds, traders and institutional investors. Investment teams now have more data, tools and compute than ever, but research still runs across siloed systems and inefficient workflows. KelAI turns that fragmented process into a compounding AI-native engine that continuously finds, tests and validates trading signals at a pace no human team can match.

KERNEL

YCombinator

Crazy fast, open source infra for AI agents to use the Internet

Kernel is crazy fast, open source infra for AI agents to access the internet 🧠🕸️ - Built on unikernels for crazy fast cold starts and low resource usage - Sub-150ms cold starts on managed headful browsers - Built-in stealth mode with residential proxies and automatic CAPTCHA solving - Full observability: session recording, live view, and full logs - Persistent sessions that maintain cookies and auth across invocations - Native support for all browser and computer use frameworks - SOC 2 compliant and HIPAA-ready Trusted by Cash App, Rye, and 1000+ others. Backed by Accel & Y Combinator (S25).

Kestrel AI

YCombinator

AI Agents for Platform Engineering

Kestrel is the AI automation layer for platform engineering teams. Platform teams use Kestrel to automate incident response, cloud provisioning, CI/CD, security, and developer requests across their stack. Kestrel turns natural-language prompts into deterministic, production-ready workflows with 25+ integrations, 140+ pre-built actions, and support for custom HTTP and webhook actions. Developer-first, with a CLI, Python SDK, and MCP server to manage workflows from where platform teams already work.

Keyframe Labs

YCombinator

Turn agents into lifelike video calls with the word's best AI avatars

Our real-time foundation models turn AI into lifelike video calls. Add the world's best AI avatars to your agents and applications in minutes with a few lines of embed code. Photorealism, emotion, and scale for as low as $0.06 per minute.

Kimpton AI

YCombinator

The IDE for Investors

In investment management, the final outcome isn't a deck or a memo. It's the trade. Kimpton is the AI-native research platform for portfolio managers. We're commoditizing the research layer and handing PMs data distilled into structured trades. The whole industry is fighting underperformance. Active managers trail their benchmarks, and capital keeps bleeding into passive. AI was supposed to fix that, but it hasn't. Funds either stitch together a dozen point tools or babysit general agents all day, and neither gets them to the trade. Kimpton goes straight to it. It ingests a fund's mandate, strategy, and positions. It runs them through our own harness and returns a structured trade proposal built for that fund. It connects to any institutional data source they already run on. And it's built to disagree, because consensus is poison for investment decisions. Instead of telling a PM what they want to hear, it surfaces the breaches and risks they'd otherwise miss. We're two ex-Goldman engineers and an ex-SpaceX engineer. We left to start our own quantitative systematic hedge fund. We raised $10M from a family office at 21 and 22, and scaled it to $35M over four years. We built Kimpton inside that fund, then productized the stack. We're live with our first institutional client, a $3.3B manager, and our first market is fundamental equity funds from $1B to $10B. Humans make the decisions. Kimpton does everything else.

Kinect

YCombinator

The AI revenue platform for D2C brands

Kinect builds AI agents that know your brand, your catalog, and your customers. On your site, they sell every visitor — running the conversation, adapting product pages in real time to each customer segment, picking the right recommendation for the question being asked. The agent picks up on what each shopper actually wants from how they ask, what they hesitate on, what they compare, and what objection makes them bounce. We take all of a brand's data and make a structured catalog, brand voice, fit notes, return reasons, segment-level nuance — all so the Kinect agents truly can speak about a brand. When an agent describes the brand, the version it describes is the one you'd want them to, not whatever it guessed from a public catalog scrape. We expose this data as well in the form of agent storefronts, letting every other AI talk about your brand in the way you would want too. We're building for human shoppers today and the AI agents that shop and discover for them. Either way, the entire website needs to get a lot smarter and personalized. Two surfaces. One layer. Built for scaling DTC ecommerce brands.

Kinro

YCombinator

Autonomous insurance brokerage for small businesses

We are building the first autonomous insurance brokerage. We hit $1M in annual revenue building insurance workflows for brokers. Then we realized the bigger opportunity was replacing them. In the US, there are 36 million SMBs, and 77% are underinsured because distribution is broken. Brokers can’t serve low-premium SMBs profitably: a $2K policy takes almost as much work as a $20K one. Kinro changes that. Our AI agents handle the full broker workflow 24/7, from finding prospects to binding policies. In 3 weeks, we got licensed in 24 states and appointed by 10 carriers. Last week, our agents autonomously bound 9 policies. Before Kinro, Pierre was an AI researcher at DeepMind. Corentin was Chief Insurance Officer at an insurtech. Parth built ML systems at Zoox.

Klaimee

YCombinator

Liability insurance for AI Agents. You deploy agents, we cover you.

Klaimee is the first insurance for your AI agents. It covers what traditional E&O and cyber explicitly carve out, so you can deploy agentic AI at scale with real peace of mind. Built for companies deploying agentic AI, self-serve from day one. The problem: AI agents are taking actions autonomously buying, emailing, modifying sensitive data. AB 316 already holds deployers liable. EU AI Act enforces in August. Cyber and E&O insurance are excluding AI claims. Companies shipping agents have zero coverage and no third-party proof their agent is safe. Enterprise legal asks "who pays if your agent breaks something?" and there's no good answer. We built the answer. Critical-category risk evaluation, certification, financial guarantee, liability insurance and the documentation enterprise procurement needs to sign off. Team: Ines (ex-General Manager at SafetyWing, grew insurance product from $5M to $60M revenue, 5 years launching insurance products from scratch and structuring a TokioMarine MGA into its own carrier) + Julien (AI software engineer + corporate strategy, enterprise compliance). We understand how insurance works, what enterprises require, and why startups can't wait 6 months for either.

Klarify

YCombinator

AI Agent for Therapists

Klarify handles every job a therapist does other than the therapy itself, from clinical notes and treatment plans to insurance claims and finding new clients. Therapists hold the world together. They also run businesses, file insurance claims, write letters, fill forms, supervise new grads, and do hours of paperwork every night. Practice management software has existed for decades. It records what therapists do. It can't actually do any of it. Klara is the AI at the heart of Klarify. She handles notes, treatment plans, clinical letters, insurance claims, between-session resources, supervision prep, and finding new clients. Nearly 8,300 therapists use Klarify today. Our mission is to empower therapists, not replace them. So they can focus on the one thing only a human can do. Be present with their client.