Although there are some similarities, these two are different in most aspects such as body structure, powertrain, horsepower, fuel economy, market segment, starting price, and ground shadow size. First of all, there is a significant difference between body structures and exterior dimensions. The 2018 Honda Clarity Plug-in Hybrid is a Sedan, while the 2018 Hyundai Ioniq Electric is a Hatchback. It is also slightly larger. Also, the 2018 Clarity Plug-in Hybrid has a more powerful engine than the 2018 Ioniq Electric, and it gets 94 fewer miles on a gallon of fuel. In addition, there is a notable difference in the starting price of the Ioniq Electric, which is $3,900 less than the base MSRP of the Clarity Plug-in Hybrid. Among similarities is the maximum occupancy.