I am a writer, and lately I have been focuse on technology reviews. In a world where technology is developing very fast, this topic cannot be missed. Especially right now when the topics of e-learning are popular, or for example, everything that can be transferred from offline to online. I want to share with you one of the trending topic: On demand delivery applications. In this article you will find useful information about the mechanism of operation of such applications and how much it cost to develop an on-demand delivery app .