Amazon on Wednesday released Amazon Seller, an iOS app that acts as a portable toolbox for merchants with accounts with the Internet sales giant to initiate sales, manage products and communicate with customers. 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.