Today, we're beyond excited to share that Mirelo has raised a $41 million seed round, co-led by Index Ventures and Andreessen Horowitz, with participation from Atlantic.vc and TriplePoint Capital. The funding is a huge milestone on our journey to reimagine how the world creates and experiences audio in videos and games, from the ground up. 

Mirelo is a company born of love and frustration. The love is a love of sound & music, and its unique emotional power. Sound doesn’t simply accompany images — it shapes emotion, tension, and meaning. The frustration came from watching technology race ahead in language and image models, while audio was left behind, and is still treated as an afterthought in creative workflows.

As video itself is changing, that gap becomes impossible to ignore. Generative video is making visual content faster, cheaper, and more abundant than ever. But as video scales, sound becomes the bottleneck. While default audio is starting to emerge, it rarely serves creative intent. Sound shapes at least half of how video is experienced, so it deserves tools built with the same depth and ambition as visual models. Even in a future where every video model produces sound by default, creators will still demand depth, flexibility, and expressive control.

Listen how sound shapes the atmosphere…

That belief is why my cofounder Florian and I built Mirelo. We’re AI researchers who’ve worked alongside some of the best computer scientists in the world — but we’re also musicians at heart. We knew AI could transform sound design for video, not by replacing creators, but making high-quality sound design accessible to anyone, while unlocking deeper control for professionals. Instead of hunting through stock libraries and syncing effects frame by frame, creators should be able to generate a perfectly synced first draft in seconds — and then shape it: add tension, change tone, explore alternatives until it feels right.

Our state-of-the-art video-to-audio model creates synced sounds out-of-the-box and let's you take it from there.

Today, our state-of-the-art models already let creators upload any video and generate high-quality, perfectly synchronized sound effects in seconds. But speed alone isn’t the goal. We’re building a specialized foundation model for the sound layer of video, designed to scale from quick creative exploration to professional workflows — enabling everything from auditioning different soundscapes to maintaining consistency across entire projects.

Our bigger mission is to become the audio layer for all visual content, across video, gaming, social media, and film. We’re now looking for people who want to build towards that future – where Mirelo revolutionizes how everyone works with sound, and helps bring more emotion and impact to audiovisual content around the world.

Mirelo is now hiring across research, engineering, go-to-market, and product.

Creating sound and music for your videos in Mirelo Studio.