Not free.
You have to open an account on their site and prices start at $199 per year.Great app for Amazon OA Sellers
Great info provided with SellerAMP. This app is one of the most crucial parts of my business. If you want to scale up then you need this appNot Free
His app requires a subscription purchase that is outside of the App Store, which is a violation of terms of service. If you subscribe to this app, it could get pulled by at anytime and they’re under no obligation to refund you the subscription fee.
Also requires PC to use and set up. Not mobile standalone.