Your Cart


    ···· ···· ···· 4242
    Test card



    Use a different card?


    pp paypal

    or pay with

    We do not keep any of your sensitive credit card information on file with us unless you ask us to after this purchase is complete.

    or pay with

    Your purchase was successful!

    We charged your card and sent you a receipt


      Gumroad Library

      Download from the App Store or text yourself a link to the app

      Arvid Kahl is a software engineer turned entrepreneur turned writer. He co-founded, ran, and grew FeedbackPanda, an online teacher productivity SaaS company, with his partner Danielle Simpson. They sold the business for a life-changing amount of money in 2019, two years after founding the business. 

      Arvid writes at He writes books, releases courses, publishes articles, and records podcasts. He also tweets a lot at @arvidkahl.
      Powered by Gumroad