On computers, you use programs and not apps. I don't care how good your phone camera is, there is nothing like working on your photos with a good big high res monitor to see what you are doing vs the tiny screens on a phone.
I am personally using a long outdated set of programs for developing my photos on my computer. I only shoot in RAW which allows me much greater latitude in what I can do with the photos before they become jpgs.
There are perfectly good free photo editing programs available for computer use whether you are using a Mac or a Windows computer.