Chat Startups funded by Y Combinator (YC) 2026

RowFlow replaces clunky web forms with natural conversations that run over text, slack, or wherever your users are. Our platform increases your form’s response rates while cutting your internal overhead in half. With RowFlow, you can take any existing form and instantly convert it into an AI-powered conversation. New flows launch in minutes and reach respondents over your preferred channel or embedded chat. We guide the exchange, follow up automatically, and return clean structured data without extra work from your team. Forms power billions of business interactions yearly. Whether it’s forms for client intake, registrations, compliance, feedback, or surveys, they all follow the same painful pattern: low conversion, messy data, and frustrated users. Teams have long tolerated forms only because there's been no scalable alternative for collecting structured information from people - until now. Our goal is for RowFlow to become the new default way for how organizations collect user data in an AI-first world.

assistant-ui helps frontend developers add AI chat to their apps. Our product is used by several dozen companies, like LangChain, Stack AI, Browser Use, and Athena Intelligence. We're building an open source Typescript/React library and a backend as a service, with first class integrations into popular agent frameworks like LangGraph and Vercel AI SDK.

Olark is easy-to-use live chat software that lets you talk to customers on your website. Olark can help you track leads, drive sales, increase conversions, and provide great customer service. Real-time visitor information like login name, geographic location, purchase history and cart contents help you personalize every interaction and strengthen customer relationships. Sign up and start making your customers happier today! Click here to sign up for a demo: https://hello.olark.com/sales

Guilded upgrades your group chat and equips your server with integrated event calendars, forums, and more.