Accel is doubling down on Fibr AI, betting that the next evolution of the web won’t be about better ads or prettier landing pages, but about websites that adapt to every visitor in real time.
The venture firm has led a $5.7 million seed round in the startup, marking a deeper commitment to Fibr’s vision of using AI agents to turn static websites into personalized, one-to-one experiences. The round also includes participation from WillowTree Ventures, MVP Ventures, and several angel investors from large enterprises. With this latest raise, Fibr has now brought in $7.5 million since launching in 2023.
At the heart of Fibr’s pitch is a familiar frustration for modern businesses: while marketing teams can precisely target ads based on who a user is and where they come from, the moment that user lands on a website, the experience usually resets to something generic. Every visitor, regardless of intent, context, or source, often sees the same homepage, the same copy, and the same call to action.
Fibr aims to close that gap. Its software sits on top of a company’s existing website and connects to analytics tools, ad platforms, and first-party data. From there, AI agents dynamically generate and test variations of content, from messaging and layout to visuals, based on how and why a visitor arrived. Instead of running slow, manual A/B tests, the system continuously adapts, learning from live traffic and optimizing experiences on the fly.
The idea is to make personalization something that happens automatically and persistently, rather than through deliberate campaigns that require engineers, marketers, and long testing cycles. Once the system is set up, companies don’t need to micromanage it. The agents keep refining the experience in the background.
That approach initially made some large organizations cautious. Fibr spent much of its early life working with a small number of customers, particularly in highly regulated sectors like banking and healthcare, where changes to websites are scrutinized heavily. Adoption was slow at first, but that same caution eventually became a signal of validation.
Over the past year, enterprise interest has picked up. Fibr now works with roughly a dozen large U.S. customers, many of which have signed long-term contracts and embedded the platform into their core web infrastructure. For Accel, that traction in conservative industries helped justify leading another round.
The firm sees Fibr as part of a broader shift in how the web itself is evolving. As AI tools increasingly mediate how people discover products and services, and as autonomous agents begin acting on users’ behalf, static websites become a liability. In that future, sites will need to respond not just to human visitors, but to richer signals about intent that may come from other AI systems upstream.
Fibr operates in a crowded market that includes established players like Adobe and Optimizely, which offer personalization and experimentation tools to enterprises. But those platforms often rely on rule-based systems and human-driven workflows. Fibr’s bet is that autonomous agents can move faster and scale personalization in ways traditional tools can’t.
The company plans to use the new funding to expand its sales and customer success teams in the U.S. while continuing product development from its engineering base in India. It is targeting around $5 million in annual recurring revenue and up to 50 enterprise customers by the end of the year.
For Accel, the investment reflects a belief that the website itself is overdue for reinvention. In a digital landscape where expectations are increasingly shaped by personalized feeds and AI assistants, Fibr is betting that businesses will no longer accept one-size-fits-all web experiences, and that the next competitive edge will come from sites that adapt as quickly as their users do.
