E-ZPass and iPass are two separate electronic toll collection systems that are used in different parts of the United States.
E-ZPass is an electronic toll collection system that is used on most tolled roads, bridges, and tunnels in the northeastern United States, as well as in Illinois, Indiana, Kentucky, Ohio, Pennsylvania, and West Virginia. It is operated by the E-ZPass Group, which is a consortium of toll agencies in these states.
iPass is an electronic toll collection system that is used on toll roads, bridges, and tunnels in several states in the United States, including Illinois, California, and Texas. It is operated by iPass Inc., which is a privately-held company that provides electronic toll collection services for toll roads, bridges, and tunnels in multiple states.
While E-ZPass and iPass are both electronic toll collection systems, they are not compatible with each other. Each system uses its own proprietary technology, and transponders from one system will not work on the other.
If you have an E-ZPass transponder, it will only work on E-ZPass-compatible toll roads, and if you have an iPass transponder, it will only work on iPass-compatible toll roads.