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Pro Supports realistic gestures & transitions
You can simulate all the typical iOS gestures such as tap, double tap, swipe & long hold. These gestures then can trigger animated transitions such as sliding, fading, pop in, & flip. This enables you to create very realistic interactable demos of your app. Checkout the demo page for some examples.
Pro Awesome version control
Every action you or your team takes automatically creates a revision you can easily revert to.
Pro Free forever for a single project & 10 screens
They have a very reasonable free tier with the paid versions starting at $12/month.
Pro Provides UI assets from all the versions of iOS
The UI library is huge and very high quality. All the UI required to design iO7 apps is included as well as iOS 6 and basic wireframing elements. For example in iOS7 it provides:
- Navigation & status bars
- Layouts (list pickers, maps, keyboards, scroll etc)
Using the app is feels very snappy.
Pro Lets you test on an iPhone as well as in the browser
You can preview your designs live in the browser as well as send them to a mobile device to better simulate the UX.
Pro User friendly
The learning curve is relatively low compared to other software that supports animations/transitions. Both building the wireframes and designing the interactions is all drop and drag.
Pro Makes it easy to plan out the app workflow
Fluid isn't just about wireframing static screens. You can plan out all the user flows and then define the transitions between them. This is really handy for planning out the entire user workflow.
Con Getting worse every day! Stay away!
We were a paying user of FluidUI at the beginning of October 2014, and it seems like weekly there are server outages, our work has been lost, features have been removed (zooming for one). Other times we cannot select controls, cannot edit text, cannot resize items, etc.
Often I simply receive a notice stating 'Too many connections' when trying to view my prototype.
Contacting support is next to useless as bugs are rarely addressed, but new 'features' make their way in the app, such as repositioning the screen on whatever control I click on so my screen is moving around more than the Teacup ride at Disneyland.