Prototype mobile experiences that feel real
Design and test native-feeling mobile app flows with realistic touch interactions, navigation patterns, and responsive layouts — before writing a line of native code.
How it works
From idea to tested prototype in four steps
A prototyping workflow designed for speed, real feedback, and confident decisions
Describe your mobile app
Tell Greta your app's core flow — tab navigation, onboarding, search, or any mobile pattern you need built and tested.
Get a mobile-optimized prototype
Receive a prototype with proper mobile constraints, touch targets, navigation patterns, and responsive layout built in.
Test on real devices
Open the prototype on any phone or tablet. Test swipe gestures, tap targets, and navigation in the actual context of use.
Refine and hand off
Iterate quickly based on what you observe on device. Hand off the refined prototype as your iOS or Android build reference.
Platform
Mobile prototyping. Without the mobile overhead.
Build realistic app experiences without native tooling, emulators, or mobile dev.
Mobile-Native Patterns
Tab bars, bottom sheets, swipe navigation, and mobile-specific patterns built in from the start.
Touch-Optimised Targets
Prototype with correct touch target sizing so what you test reflects real usage behaviour.
Test on Real Devices
Open on any phone and interact as a real user would — no emulator, no simulator.
iOS & Android Flexibility
Design for either platform convention without being locked into native tooling.
Responsive from Day One
Layouts adapt correctly across phone sizes so your prototype matches real device diversity.
FAQ
Got more questions?
Everything you need to know before you start prototyping with Greta.
No. Describe what you want and Greta applies mobile-native patterns and constraints automatically.
Yes. Mobile prototypes serve as a clear visual and interaction reference for iOS and Android developers.
Categories
Explore other categories
Greta works across every prototyping use case. See what else you can build and test.
Build Something Real
If you can describe it, you can build it.