Crypto Cost Average Apps

Is there any crypto apps or just apps in general that help you figure out the cost average relatively easy? I’m doing everything on my iPhone calculator app and then copy and pasting on to the notes app and it takes up time. For instance I have $60k in doge @ $.22 and want to buy some if it reaches $.07. I have to average it all out and add everything constantly back and forth from the notes app and calculator app.