When comparing MockFlow vs UX-App, the Slant community recommends UX-App for most people. In the question“What are the best mockup and wireframing tools for websites?” UX-App is ranked 26th while MockFlow is ranked 29th. The most important reason people chose UX-App is:
UX-App uses a drag and drop puzzle like JavaScript representation. Unique and expressive
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Pros
Pro Export to PNG, PDF, HTML
Export to PNG, PDF and HTML formats.
Pro Easy to learn
Easy to pick-up. In few minutes you can sketch your first pages.
Pro Online software
You can use it online. No download, no install, no mess.
Pro Free basic account
The free basic account give you a lot of features, all for free, forever.
Pro HTML5 rendering
Use many Bootstrap components and get the HTML5 view quickly. Sketch, see, repeat.
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.
Cons
Con Need a Flash plugin
Flash is a technology of the past. Unfortunately, they use it. "MockFlow requires Flash Player 10 or above."