Frischluft Fensterbrett was founded by Benedikt Hartmann and Lukas Benkhoff and offers a mobile window board that moves with an opening window so items need not be cleared away. The founders are students in Munich (Hartmann studies mechanical engineering; Benkhoff studies business administration). Without a marketing budget they generated roughly €160,000 in revenue within six months, driven largely by viral social media reach. On television investors praised the practical simplicity but some criticized the design and potential insulation impact. The company completed an equity deal on Die Höhle der Löwen with investor Ralf Dümmel, who acquired a 15% stake for €199,000.

Total raised

$0M

Funding rounds

1

Latest round

Equity

Latest activity

Apr 2026