Stripe uses something similar too. I'd say it's almost a "round" version of material design. It is present in the artwork too. Solid block colours and focus on

Stripe uses something similar too. I'd say it's almost a "round" version of material design. It is present in the artwork too. Solid block colours and focus on geometric shapes. There are varients too (Facebook and Google do something similar, but their UX controls are sharper, but artwork similar design to this). I think it's just a current trend in the SaaS world. Search for "SaaS website templates" and you'll find most of them have this same style.