Den
YC X25San Francisco, US · Founded 2025 · 2 employees · 2 known investors
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480 people in our graph share verified history with the Den team — schools, employers, funds. One of them is your warm intro.
Garry Tanunlockedknows Justin Lee · together at Y Combinator (overlapped)
×11knows the team · via Y Combinator
Den builds AI agents that learn from individual conversations and can respond to messages on behalf of their owners via text or phone. The product targets individuals who want a digital representation that can handle communications when they are unavailable.
Also known as Mortar
AI & Machine LearningConsumerDeveloper ToolsEnterprise SoftwareFuture of WorkSaaSUnited States of AmericaAmerica / Canada
Founders & leadership· Y Combinator alumni (X25)
Den was founded in 2025 by Linus Talacko, Justin Lee, and Nicole Lu.
LT
Linus Talackoin𝕏Co-FounderCo-founder of Den, which develops AI agents that learn from user conversations and respond to messages on behalf of their owners via text or phone.
JL
Justin Leein𝕏Co-FounderCo-founder of Den, which develops AI agents that learn from user conversations to handle communications on behalf of their owners via text or phone.
NL
Nicole LuCo-founder & CEO
Investors · 2
Competitors · 7
by search overlapDensity7 shared keywordsDensity AI designs custom AI accelerators optimized for frontier-scale large language model inference, combining near-memory compute architecture with high-bandwidth memory density. The company builds silicon-to-software solutions tailored for production inference workloads.
Density7 shared keywordsDensity makes Waffle, a self-installable real-time radar sensor for anonymous people counting in rooms, phone booths, and desks. It provides occupancy data through a real-time and historical API for workplace and space management.
PromptLoop5 shared keywordsPromptLoop is a spreadsheet platform that enables users to integrate and run AI models on tabular data to generate insights and automate research workflows. The tool is designed for spreadsheet users seeking flexible, verifiable AI capabilities.
Nodes4 shared keywordsNode AI operates a decentralized GPU marketplace where hosts can lend GPU compute and clients can rent it on a pay-as-you-go basis to train and deploy AI and machine learning models. The platform serves individuals and enterprises, with hosts earning rewards paid in Ethereum.
Startuphub4 shared keywordsStartupHub.ai is an open data and intelligence directory covering AI-ecosystem companies, founders, and capital, accessible to both people and AI agents. It offers a free browsable database of AI startups, with paid tiers for API, MCP, and bulk-export access.
Latent AI4 shared keywordsLatent AI builds tools and services for deploying, optimizing, and updating machine learning models at the edge, including in disconnected real-world environments across varied hardware and device fleets. It serves enterprise AI teams and defense customers, aiming to move AI processing off the cloud to reduce compute costs and enable field-updatable models.
Defined4 shared keywordsDefined.ai provides commercially-safe visual and language content datasets for training generative AI models, ensuring creator rights protection and regulatory compliance. The company serves AI/ML developers and enterprises building AI solutions across creative, social, and ecommerce sectors.
Companies competing with Den for the same Google search keywords, organic and paid, via search-intersection analysis.
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Frequently asked questions
- What does Den do?
- Den builds AI agents that learn from individual conversations and can respond to messages on behalf of their owners via text or phone. The product targets individuals who want a digital representation that can handle communications when they are unavailable.
- Who founded Den?
- Den was founded by Linus Talacko, Justin Lee, Nicole Lu in 2025.
- Who are Den's investors?
- Den's investors include Y Combinator, Transpose Platform Management.
- Where is Den headquartered?
- Den is headquartered in San Francisco, US.