When comparing Moqups vs UX-App, the Slant community recommends Moqups for most people. In the question“What are the best mockup and wireframing tools for websites?” Moqups is ranked 1st while UX-App is ranked 25th. The most important reason people chose Moqups is:
Ranked in these QuestionsQuestion Ranking
Pro Fast and doesn't require any plugins
Pro Supports 960gs
As well as a standard snap-to-grid, Moqups supports the 960 gridsystem.
Pro Free tier
The Free Plan offers 2 active projects with at most 300 stencils each and 5 MB of storage. This plan does not include: Master Pages, Real Time Collaboration, Privacy Settings, Unlimited Revisions, Unlimited Project Archiving and Teams.
Pro Clean design and very intuitive
Pro Keyboard shortcuts
Moqups has an extensive list of keyboard shortcuts. Simply type some A-Z letters to search for components. F1 for an overlay help screen.
Pro Modern Material elements
Pro Free upgrades for nonprofit/education
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.