Lucent

Lucent is an AI company founded by solo founder Alisa Wu (listed on Y Combinator as Alisa Rae) and based in San Francisco. At the time of its October 2025 pre-seed announcement, the company positioned itself as a supplier of behavioural datasets for frontier AI labs, grounded in real-world product usage and real web interactions, with a focus on training data for AI agents that operate web browsers to complete tasks such as booking travel, filling in online forms and e-commerce shopping. The company described itself as being in private beta and, per the founder, had no shipped product and no team at the time of the raise.

Y Combinator's company page describes Lucent as an "AI product manager" that automatically improves products based on user behaviour: it connects to a customer's PostHog account, uses AI to watch and interpret session replays continuously, and detects bugs and UX issues, routing findings to Slack or Linear as users encounter them. The company was founded in 2025, is part of Y Combinator's Winter 2026 batch with Gustaf Alstromer as primary partner, has a team size of 2, and operates the site lucenthq.com.

Founding story

Lucent was founded by Alisa Wu (also listed as Alisa Rae), aged 22 at the time of the October 2025 funding announcement. Wu previously bootstrapped and sold an Australian EdTech startup, Stella AI, which was built and exited within nine months and acquired in 2024 by an NSW-based education company. Before that she was a founding engineer / employee #2 at MagicBrief, an AI advertising platform acquired by Canva for over $20 million, and worked as an engineer at Atlassian. Per the YC launch post, Wu's long-standing interest in session replays — valuable data that mostly goes unwatched — motivated building Lucent.

Business model

Lucent supplies data and AI-driven product analysis. Its stated approach is to provide behavioural datasets derived from real web/browser interactions to frontier AI labs that need unique datasets for specific use cases, and, per its Y Combinator launch, to offer an AI service that watches customers' session replays and reports detected bugs and UX issues into their workflow tools.

Traction

As of the October 2025 raise, Lucent had closed an oversubscribed $2 million pre-seed within 36 hours and described itself as in private beta with no shipped product and no team. Its Y Combinator launch states the product is used by more than 30 Y Combinator companies, and YC lists a team size of 2.

Latest developments

Lucent appears in Y Combinator's Winter 2026 batch with an active status, a team size of 2 and Gustaf Alstromer as primary partner, and has launched an AI service that monitors session replays via PostHog integration and reports issues to Slack or Linear.