Square: Best overall Image: Square When it comes to using free card readers for iPhones, Square’s card reader is hard to beat. In addition to issuing a free card reader on your first order ...

The best credit card readers for iPhones are: Square Reader for Contactless and Chip: Best overall SumUp Plus: Best hassle-free option Shopify Tap & Chip: Best for ecommerce Clover Go: Best ...