| Operating system | Developer | First release | License |
|---|---|---|---|
| IOS 4 | Apple Inc. | 2010 | Apple Public Source License |
| IOS 5 | Apple Inc. | — | Apple Public Source License |
| IOS 7 | Apple Inc. | 2013 | Apple Public Source License |
| IOS 8 | Apple Inc. | 2014 | Apple Public Source License |
| IOS 9 | Apple Inc. | 2015 | end-user license agreement |