The above is a chronological listing of every iOS device ever released, along with certain hardware details (to do with compute performance) for each unit.

I have pulled this data from many different web sources out there, including some of my own creation in the time since the iPhone debuted. In some instances, I encountered conflicting data and made a call based on what seemed best supported by other data. (I don't plan to compile a link list of sources, as confirmation of the various data pieces came from a dizzying number of websites and I've not logged what from where and, as I mentioned, some of these data points are judgement calls between conflicting reports.) Some data points are missing, but it is my intention to work towards making the chart as complete as possible, and keeping it up to date and adjusted in the case of an inaccuracy come to light. The original purpose of this chart was to give myself a yardstick to help in assessing the potential application performance of Apple's evolving iOS hardware lineup. As such, it lacks details such as wireless protocols, connectors, camera specs, case colors, and the like.

After assembling this data, I've decided to share it as a reference for others. Take it for what it's worth.