Adobe's answer to Sketch is Adobe Experience Design (XD). For many years sketch has been the pioneer tool for UI/UX designers, and has created a community which includes a set of plugins, forums, and integration with tools like Figma and InVision. The only issue Sketch has that its exclusive to Mac users. Windows users still used to create UI/UX sets on tools like Adobe Photoshop.
If you are an old existing Sketch user and are not interested in what XD has to offer, do yourself a favor and keep reading the below post. Adobe itself has claimed in the Adobe Max Cofrence 2018 that XD is going to be bigger than Photoshop. To be noted that, Photoshop is the largest platform for designers to create artworks globally. There is just no alternative.