Creating custom apps like an Upwork clone requires expertise, and your recommendation of Apptunix as an established company is insightful. If you're interested in learning more about the nuances of on-demand app development and the strategies for creating successful apps, I recommend reading this article from Cleveroad's blog (https://www.cleveroad.com/blog/on-demand-app-development/). It provides valuable insights and practical advice that would complement your understanding of the on-demand app development process.