An open source wireframe to app tool powered by Llama 3.2 vision. Upload a screenshot of a simple site/design & get code.


The best UI Design alternative to POP (Prototyping on Paper) is Napkins.dev, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to POP (Prototyping on Paper) and eight of them are UI Design Tools so hopefully you can find a suitable replacement. Other interesting UI Design Tool alternatives to POP (Prototyping on Paper) are Frame0, Balsamiq Wireframes, Wireflow and quickMockup.
An open source wireframe to app tool powered by Llama 3.2 vision. Upload a screenshot of a simple site/design & get code.


Sketch your app ideas without stress Make hand-drawn style wireframes quickly and easily.




Low-fidelity UI wireframing tool simulating sketching experience, optimized for speed with Quick Add, built for collaboration, drag-n-drop simplicity, exportable wireframes to PNG/PDF, interactive prototypes via linking, hundreds of UI components, reusable symbols, and more.






Feature-rich, open-source Wireflow offers a collaborative platform for online creation of complex user flow prototypes. Ideal for team work in UI design, wireframing, and mind mapping, promoting idea sharing in real-time environment aided by modern whiteboard features.

Online tool for creating mockups in the browser. Use your browser’s save function to save the file (just html for view only, complete save for an editable version) or export to codepen for others to view.

Automatically connects to your Photoshop document and converts your mockups into interactive prototypes using layer comps to organize your documents into screens. Transition between them by defining hotspots in the layer name you want to be tappable.



Briefs is the essential app design tool built for a professional design workflow. Lifeless mockups don’t tell the entire story, but you don’t have time to build a prototype. We’ve been there, too. Your clients needed a clearer picture, so give them something to touch.






POP is an app-based app prototyping tool, to be viewed on a device. Balsamic is not.