When comparing UX-App vs Keynote, the Slant community recommends Keynote for most people. In the question“What are the best mockup and wireframing tools for websites?” Keynote is ranked 24th while UX-App is ranked 26th. The most important reason people chose Keynote is:
Can import all kinds of assets (images, videos, PDFs, sounds) into mockup without hassle.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Prototype with graphical JavaScript
UX-App uses a drag and drop puzzle like JavaScript representation. Unique and expressive
Pro Mock up & prototype in the browser
Allows you to mock up with real HTML, and present expressive prototypes in the browser. Has lots of conveniences like team chat, notes, and a share link to present prototypes.
Pro Long free trial & cheap subscription
It's possible to start without creating an account. Creating a free account extends the trial, and the memberships are cheap @ $5/month.
Pro Imports nearly every type of asset
Can import all kinds of assets (images, videos, PDFs, sounds) into mockup without hassle.
Pro Animations and transitions
Keynote currently is one of the very few tools that supports animation of elements and transition of views without programming.
Pro Text Styles makes it easy to create typography systems
Pro Smart Snaps
Keynote has alignment grids (aka snap to grid feature) that snaps to end, midpoints, baselines etc of objects and grids. They are super useful when you want to follow a structured layout for your wireframe.