Search Startups funded by Y Combinator (YC) 2026

Shepherd automatically ingests every tool your team uses into one unified memory you can index, and your agents can act on.

Cerenovus is a company brain. We aggregate every kind of file a company produces — documents, PDFs, emails, Slack messages, spreadsheets, meeting notes — and convert them into a single markdown knowledge graph with native AI-agent integration. A company's information becomes uniformly readable both by humans and by the AI agents working inside the graph. On top of that foundation, Cerenovus maps the company as a system, drawing connections between the people, processes, and tools that make up real workflows. From that systems map, it infers where operations are inefficient and how to improve them. In practice, this tool will help executives make better decisions. Whenever a leader has to act on a question — how to restructure a team, whether to keep a vendor, or where handoffs between teams are breaking down — Cerenovus will give them an evidence-backed answer in minutes rather than weeks. Today, that work is done by consultants, by internal analysts, or by the executive asking around informally. Each of those approaches is slow, partial, and goes stale the moment it is delivered. Cerenovus produces the same answers faster, at a fraction of the cost, and keeps them live as the company evolves.

Serafis is building super-intelligence for financial markets. We mine petabytes of unstructured data to identify narrative inflections before they become consensus. Think building early conviction in Bitcoin (2014), Tesla (2018), or Nvidia (2022). We are already live with 12 organizations managing over $70B in capital.

We spend our lives in messaging apps. Slack. iMessage. WhatsApp. We face a constant stream of information, introductions, and things we need to do. What if you could bring together every message, from every platform, in a Superhuman-like experience, with AI agents that automatically complete your action items? That’s exactly what we’re building at Pally; a future where you never need to check another inbox again.

Find & connect with your perfect leads by prompting in Origami. origami.chat has 100+ data sources - use it to find more of your perfect customers, enrich a CSV, or launch a sequence to connect with decision makers. Try it out and start connecting with your perfect leads in minutes, start free → origami.chat Used by sales teams at CBRE, Clipboard Health, Remote.com, and more.

At Undermind, we're building a search engine that can handle extremely complex questions. It’s geared at experts, like research scientists and doctors, who need to find very specific resources to solve high-stakes problems. We’ve rebuilt search from the ground up to address this. Our new approach employs high-quality LLMs to adaptively explore a database, mimicking how a human researcher carefully discovers information. This approach dramatically outperforms (by 10-50x) traditional keyword search and other modern AI-based retrieval methods. Our first target users are the 50 million researchers searching for scientific literature on PubMed and Google Scholar every month. We’ve have paying users across fields like medicine, ML, biotech, finance, and more.

Onyx is the open source chat UI connected to your company’s docs, apps, and people. We ingest and sync from all sources of information (Google Drive, Slack, GitHub, Confluence, Salesforce, etc.) to provide a centralized place for users to ask about anything. Imagine your most knowledgeable co-workers, all-rolled into one, and available 24/7! Check us out on Github: https://www.github.com/onyx-dot-app/onyx Or visit our website: https://www.onyx.app/

Reducto is the agentic document platform for leading AI teams building systems to automate document workflows at enterprise scale. Our platform provides a comprehensive toolkit for working with documents the way a human would, combining custom in-house and leading frontier models to power efficient and accurate document workflows. Reducto is trusted by leading AI teams at companies like Harvey, Scale AI, and Vanta. We are built for enterprise workloads with flexible deployment options from the cloud to fully air-gapped environments, SOC II and HIPAA compliance, and zero data retention. Learn more: https://reducto.ai/ Find our YC deal: https://reducto.ai/yc

Webhound builds long-horizon AI research agents that scale quality with time and budget. Our agents can create either structured datasets or fully cited research reports.

Waldium is an AI-driven platform for researching, writing, and publishing technical knowledge in formats that both humans and AIs can understand. We help developers create technical guides, resources and tutorials — structured, durable knowledge that AIs can learn from, cite, and build upon.

Artemis Search is a vector database search with a twist. We use special-purpose deep-learning models instead of using textual / semantic similarity to evaluate how good a search result is. This enables us to actually reason how well search results match the intent of the search query, eliminating the problems that come from evaluating search results on how much they look like the search query.

Connect your data. Train your models. Query text, user or session context and retrieve relevant results in milliseconds. Explore our case studies to see how we’ve helped leading brands drive significant engagement and revenue: https://www.shaped.ai/case-study.

Instead of just links, Andi AI gives you answers - like chatting with a smart friend. Andi is a new type of search engine that uses generative AI and language models combined with live data to generate factually correct answers to questions, and to explain and summarize information combined from the best sources. Andi works as a search chatbot that's ad-free and privacy-focused. Ask Andi to... ✅ Answer questions 🧠 Find, summarize and explain information 🔍 Navigate and search the web Search is broken because of SEO spam, ads, and surveillance capitalism. Andi cuts through the clutter to get you straight to the knowledge you need. It presents results visually in a way that's easy to understand with a simple chat interface, and protects you from ad tech and distraction. You can try the search app at https://andisearch.com

Exa is a search engine built for AIs. We enable developers to filter the internet's content with complex queries in order to bring the world's knowledge into their AI apps.

Infrastructure for search teams building retrieval and RAG. Trieve combines search language models with tools for tuning ranking and relevance. Building excellent search is difficult and can take months to implement then even more time to maintain. Trieve offers production-ready infrastructure that works out of the box to help search teams build adjustable AI search and RAG into their products. With tools for custom models, relevancy weighting, date-recency biasing, semantic full-text hybrid search, recommendations, and more Trieve covers the full spectrum of what a team wants from their discovery infrastructure.