The Human Rights Campaign wants to make gay-friendly buying easier with a new iPhone app that allows shoppers to access its "Buying for Equality" guide.

The new technology allows shoppers to enter a store to see how hundreds of American brands are rated based on the businesses' treatment of their gay employees. The technology divides businesses into red (brands to avoid), yellow (brands that have made some progress), and green (brands to support). The color codes are based on the HRC's Corporate Equality Index.

Both Apple and AT&T, which is the iPhone's exclusive service provider, scored 100% on the Corporate Equality Index.