<a href="https://www.sketch.com/" target="" rel="">Sketch</a> (Mac OS only) Paid, free trial available UI designing will be crazy with this app. Sketch is a mix of Adobe Illustrator and Photoshop in a lightweight (About 55MB) version. It is easy to use, has powerful vector editor, hundreds of plugins and has a wide range of resources. All UI design software supports sketch format. Note: Sketch it is only for Mac OS. Download link: <a href="https://www.sketch.com/" target="" rel="">https://www.sketch.com/</a> <a href="https://icons8.com/lunacy" target="" rel="">Lunacy</a> (For Windows) Free Finally, found a Sketch alternative for Windows. It’s like a copy of Sketch app.Lunacy has native support for sketch files. Lunacy can view, edit and save sketch files. It is easy to use, has powerful vector editor and has all the necessary features. Lunacy updates regularly and it is getting better. I personally use this app since I use Windows. Download link:&nbsp;<a href="https://icons8.com/lunacy" target="" rel="">https://icons8.com/lunacy</a> <a href="https://www.adobe.com/products/xd.html" target="" rel="">Adobe XD</a> (Windows, Mac) Free Adobe XD is full featured UI design tool, where you can create design, add animations and collaborate with others. XD is easy to use like Sketch, Lunacy. But It is heavy app and takes a lot of resources. XD has many unnecessary features. Also Adobe customer support is terrible. Download link:&nbsp;<a href="https://www.adobe.com/products/xd.htm" target="" rel="">https://www.adobe.com/products/xd.htm</a>l Invision Studio (Windows, Mac) Free InVision Studio is new released. InVision Studio focuses interactive animation and design collaboration. But it has many bugs because it is new. You can try it out. Download link:&nbsp;<a href="https://www.invisionapp.com/studio" target="" rel="">https://www.invisionapp.com/studio</a> What I use I use Lunacy as I’m a Windows user. If you use Mac OS, I recommend Sketch. I&nbsp;used Adobe XD, InVision Studio before but Lunacy, Sketch is better.

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