ProtoPie vs FluidUI

As the interface is very clean and simple, it enables you to create interactions by combining objects, triggers and responses just like that. No need for wireframing or shitty mockups, just get to hi-fi prototyping right away.

Deploy prototypes on any device right away. What's the point of prototyping mobile apps if you cannot deploy it on your mobile devices easily?

Create prototypes e.g. chat platforms, payment apps etc. and deploy them on multiple devices and have them communicate with each other.

Easily control the sensors of smart devices in your prototype, such as tilt, sound, compass, proximity sensor, vibration motor and 3D Touch sensors.

It offers the same features on both MacOS and Windows. Plus, you can switch machines as long as you are logged in to ProtoPie Studio.

Sharing is very easy via the cloud. Open the prototype in desktop or mobile browser, or deploy the prototype on the ProtoPie Player app. All is possible.

No coding needed to do interactions for your prototypes. You just choose the objects and link them with the triggers and responses you want to based on your preferred interactions.

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.

Work with your team on a design. Connect on live video calls and chat or add comments.

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.

Every action you or your team takes automatically creates a revision you can easily revert to.

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:

• Backgrounds
• Navigation & status bars
• Layouts (list pickers, maps, keyboards, scroll etc)
• Controls
• Typography
• Icons

Using the app is feels very snappy.

They have a very reasonable free tier with the paid versions starting at $12/month.

You can preview your designs live in the browser as well as send them to a mobile device to better simulate the UX.

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.