IQFeed is a true, unfiltered, tick-by-tick data feed. It includes several standalone apps (chart, news, SnapQuote, etc.), although it primarily powers dozens of 3rd party software applications with both streaming and historical data.
DTN.IQ is a legacy DTN software product that runs on IQFeed (the data feed). DTN.IQ includes all of the apps from IQFeed in a handy “SmartBar” that can be docked on the desktop. In addition, it has a larger simultaneous symbol limit (1300) than the IQFeed standalone product (500).