The Amazon Seller app allows merchants affiliated with Amazon to search for new products to sell, check rankings and estimate profits, among other useful seller tools.
For example, the app's search function taps into Amazon's database to find prices, sales rankings and customer reviews. Users can type in keywords or "scan in" barcodes with an iPhone's camera.
Aside from the usual product listing creation tools available through other merchant-facing apps, Amazon Seller includes a unique tool that estimates profitability of an item before posting by factoring in Selling on Amazon and Fulfillment by Amazon fees. In addition, sellers can interact with customers via a dedicated Communication pane.
Amazon Sellers comes in at 5.8MB and is free to download from the App Store, though users have a U.S. Amazon Sellers account to activate services.