Get to know First Floor Software

First Floor Software, based in The Hague, The Netherlands, was formed in 2008 with the purpose of providing consultancy and building high-quality software products. First Floor Software has a primary focus on cross-platform mobile development.

First Floor Software is a privately owned company with no external funding.

Products and services

First Floor Software is an Independent Software Vendor specialized in cross-platform tools and components. Currently deeply invested in both Xamarin and Flutter.

First Floor Software products make an impact. The company is well-known for it’s (now obsolete) runtime inspector tools such as Silverlight Spy and XAML Spy.

Next to product development, First Floor Software provides consultancy services to customers who require cross-platform expertise. Contact us if you want to learn more about how First Floor Software can help you build great cross platforms apps.


First Floor Software was founded by Koen Zwikstra, who previously has been involved in the development of many complex applications. Koen is a professional developer with over 25 years of experience in software development.