Based in Portugal

We build apps people love to use

Castles Bay is a software studio focused on crafting thoughtful mobile experiences — from concept to launch and beyond.

Native-quality apps built with React Native. Cross-platform performance with a single codebase for iOS and Android.

Modern web applications and APIs built with scalable, reliable architectures ready for growth.

Product thinking from day one. We shape ideas into viable, user-centered digital products.

Rigorous testing, clean code, and meticulous attention to every interaction detail.

App Store optimization, analytics integration, and continuous iteration. We don't just build — we help your product grow and find its audience.

Let's talk about your next project — info@castlesbay.com