There are a lot of tools that do similar things. I think of the categories as:
*Design creation* • Figma https://www.figma.com/ • Sketch https://www.sketch.com/ • uizard https://uizard.io/ • Penpot https://penpot.app/ • UXPin https://www.uxpin.com/
*Asset creation* • Canva https://www.canva.com/ • Crello https://crello.com/ • Creatopy https://www.creatopy.com/ • Spark https://spark.adobe.com/
*Presentation creation* • Pitch https://pitch.com/ • Ludus https://ludus.one/
*Digital Whiteboard* • Miro https://miro.com/ • Whimsical https://whimsical.com/ • Mural https://www.mural.co/
*Prototyping* • Invision https://www.invisionapp.com/ • Marvel https://marvelapp.com/
*Feedback* • Markup https://www.markup.io/ • Pastel https://usepastel.com/ • Contrast https://www.contrast.app/
*Animation* • Jitter https://jitter.video/
And that just scratches the surface.
I've noticed that the apps listed above are often too prescriptive or too complicated. My goal is to create a simple tool that lets you quickly provide feedback and iterations on websites and web apps. I think of NextUX as similar to Loom but for design mockups.
In my workflow, I typically include a NextUX link along with an exported image in my product management software (Trello). I describe the changes I made contextually with comments in the design. Often, the design looks hacked together and incomplete but it's just enough to communicate a change. My focus with NextUX is to make the iteration process faster.