Vibe coding startup OpenBuilder wants to take on vibe coding giants like Lovable and Replit, arguing that the pricing models of dominant products are unsustainable and profit when non-technical users get stuck.
OpenBuilder participated in Y Combinator’s Fall 2025 batch and has raised $2.2 million in seed funding from Focal, Founder Factor, Pascal Capital, and others.
While vibe coding is transforming software, OpenBuilder’s cofounder and CEO, Paul Li, told Business Insider that bugs leave projects unfinished and drive up costs.
Rather than credit-based pricing, OpenBuilder charges a fixed subscription for unlimited use, with the option to pay for human developer support when needed.
The tool is built on open-source coding models from Z.ai and the Chinese startup DeepSeek, which are cheaper and offer greater flexibility. As AI costs fall over time, Li says pay-per-use business models will become untenable.
“Our bet is that over time, users are going to become educated and aware enough of the landscapes that eventually it will shift to more fixed pricing,” he said.
In addition to OpenBuilder’s three employees, the company works with four contractors to provide developer support. It will use the seed funds for hiring and marketing.
Li and cofounder and CTO James Jiang dropped out of the University of Waterloo to cofound a virtual reality gaming company called Mirage VR, and in 2023 pivoted to a coding assistant for software developers called EasyCode, which attracted roughly 1.5 million installs.
They went through Y Combinator with EasyCode, too, though they opted not to raise funds because the company was growing quickly and had already conducted a raise. Li said he regretted that decision as competition within the field intensified.
OpenBuilder targets non-technical builders, including hobbyists and aspiring entrepreneurs. It largely targets small businesses building tools to avoid pricey software products, Li said.
Here’s a look at the pitch deck OpenBuilder used to raise its $2.2 million seed. Slides have been redacted so that the deck can be shared publicly.
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