| Operating system | Developer | First release | License |
|---|---|---|---|
| IOS | Apple Inc. | 2007 | proprietary license |
| IOS 15 | Apple Inc. | — | — |
| IOS 4 | Apple Inc. | 2010 | Apple Public Source License |
| IPhone OS 1 | Apple Inc. | 2007 | proprietary license |
| IPhone OS 2 | Apple Inc. | 2008 | Apple Public Source License |
| IPhone OS 3 | Apple Inc. | 2009 | Apple Public Source License |