AI software-building startup Lovable has raised $400 million at a $13.3 billion valuation, more than double the $6.6 billion valuation it received in its December funding round.

Menlo Ventures led the Series C alongside EQT-managed Scaleup Europe Fund in the latest sign of investor appetite for vibe-coding startups.

The Stockholm-based company’s annual recurring revenue has nearly tripled since December, cofounder and CEO Anton Osika said.

Lovable disclosed in March that it had reached $400 million in annual recurring revenue, up from $300 million a month earlier and $200 million at the end of 2025.

In a blog post on Wednesday, Lovable, which…