Quillmark

Quillmark is a mobile product studio in Berlin. We design and build iOS and Android apps for consumer startups, from first prototype to App Store launch and beyond.

Our team of designers and engineers works in small squads of four to six people, so every client gets senior people from day one. We build natively in Swift and Kotlin, or cross-platform with React Native when speed to market matters most.

We focus on retention, not just launch. Every app ships with analytics, onboarding experiments and a clear plan for the first 90 days. Since 2018 we have shipped more than 40 apps in fitness, personal finance and delivery, with a combined 3 million downloads.