Pixate is an Accel-funded Y Combinator alum. It's initial focus was to allow developers to style native applications using CSS. Nowadays, it has a much broader approach. It gives a highly visual environment for building android and iOS apps without writing a single line of code.
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Pro Handles complex animations/interactions well
Pixate allows designers to prototype their apps by using complex animations and interactions, all handled flawlessly by Pixate.
Pro Produce native prototypes
While all the work for building prototypes is done through the web browser, Pixate allows for the testing to be done on the devices themselves.
Pro Free plan
Pixate offers a free plan that entails one project and one prototype. While the amount of functionality is limited, it does give a user a chance to trial the software for as long as they want in order to see if it is worthwhile.
Pro Supports drawing assets right in their editor
Pixate's editor allows designers to draw the assets which will later be used in the prototype right in their web editor.
Con Interactive testing must be done on mobile device
Currently Pixate does not offer a way to interact with the design on ones PC, all testing must be done on a mobile device, which may become time consuming or tiresome.
Con Does not integrate with Photoshop or Sketch (yet)
Pixate does not integrate with Adobe Photoshop, although it has been anounced as a feature that will soon be added to it.