Mirelo, a Tübingen, Germany-based startup developing foundation models for sound in videos, has raised $41 million in a Seed funding round.
Investors
The round was co-led by Index Ventures and Andreessen Horowitz, with participation from Atlantic.vc and TriplePoint Capital, alongside notable angel investors from the AI ecosystem include Yariv Adan (former Google Zürich Site Lead), Alex Berriche (Fleet.co), Léon Bottou (AI scientist, Meta), Burkay Gur (Fal.ai), Thomas Hofmann (AI Professor, ETH Zürich), Antoine Le Nel (Revolut), Coco Mao (OpenArt), Arthur Mensch (Mistral AI), Laura Modiano (OpenAI), Jakob Uszkoreit (Inceptive, co-inventor of the Transformer architecture), and Thomas Wolf (Hugging Face).
Index Ventures is a global, multi-stage venture capital firm headquartered in San Francisco, California, and London, United Kingdom. Founded in 1996, the firm backs exceptional entrepreneurs with the ambition to build large, global, category-defining technology businesses. It invests in early- and growth-stage technology and life sciences startups.
Andreessen Horowitz (a16z) is a venture capital firm that backs bold entrepreneurs shaping the future through technology. Founded in 2009, the firm manages multiple funds across stages, sectors, and geographies, with over $46 billion in committed capital. a16z invests in seed- to growth-stage companies across AI, bio + healthcare, consumer, crypto, enterprise, fintech, gaming, infrastructure, and companies building toward American dynamism.
Mirelo Use of Funds
The funding will support scaling Mirelo’s AI models, expanding its API and web-app offerings, and accelerating development of its video-to-sound-effect platform.
About Mirelo
Founded in 2023 by CJ Simon-Gabriel and Florian Wenzel, Mirelo is an AI-driven audio technology company that builds state-of-the-art AI audio models to bring emotion and impact to visual media. Its platform allows users to generate synchronized sound effects for videos in seconds, leveraging foundation models developed by its founders. The company’s main product, Mirelo Studio, offers content creators the ability to add infinite, spot-on audio and off-screen ambience to their content with a high degree of creative control. Headquartered in Tübingen, Germany, Mirelo’s broader mission is to become the audio layer for all visual content across videos, gaming, social media, films, and beyond.
Funding Details
Company: Mirelo AI GmbH
Raised: $41.0M
Round: Seed
Funding Date: December 2025
Lead Investors: Index Ventures, Andreessen Horowitz
Additional Investors: Atlantic.vc, TriplePoint Capital, Yariv Adan, Alex Berriche, Léon Bottou, Burkay Gur, Thomas Hofmann, Antoine Le Nel, Coco Mao, Arthur Mensch, Laura Modiano, Jakob Uszkoreit, Thomas Wolf
Company Website: https://www.mirelo.ai/
Software Category: AI Audio Technology / Video Tools
Source: Connor Mitchell