Optimal app's for sending & accepting cargo

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I often had to order delivery from some address to my address, so that the courier picked up the cargo there. But it was very uncomfortable. It was necessary to call in a taxi and they were picking up a car for me that was supposed to pick up at times an ordinary envelope. Therefore, I thought how to solve this problem using modern technological tools. In the end, I created this application. I would like to receive feedback, criticism. I'm ready to respond to everything.