i have this app on my iphone due i have to purchase it for windows also, if not can i just download the app and use the same login as the phone
Thank you for using Codebook and posting to the discussion forum. Each platform of Codebook is a separate purchase. We offer a 14 day free trial of Codebook for Windows here: https://www.zetetic.net/codebook#download
Once you get Codebook for Windows downloaded and installed you can follow these instructions to add it as a new device: Codebook Help - Syncing with a New Device
Please let us know if you have any further questions.