Developing apps for the operating systems
Widgets, programming languages and release datesThe Android allows widgets and the iOS does not except in NotificationCenter. As you may know, the Android was developed by Google and the iOS was developed by Apple. The operating system family for the Android is Linux, and the operating system for the iOS is OS X and UNIX. The first release of the iOS was in 2007, and to most people’s surprise the Android was only released a year after in 2008.
Apple still had a monopoly over the Smartphone world in those days, which is why the Android was barely heard of. As Smartphone manufacturers started to catch up to Apple they started to use the Android more. That is why you hear about that Android more these days, which has lead people to believe it was actually are far more recent creation than it was.
Open source or not?As mentioned, the Android is open source and the Apple iOS is Apple exclusive, which is why you will only see the iOS on Apple produced products. However, before people start writing in to complain, there are some elements of the iOS, which are open source, but for the most part it is an Apple exclusive thing.
The Android has an auto-respond call feature. The iOS has that too, but also has a do not disturb feature and a call back feature. If you wanted those features on your Android too then you either buy a device where the manufacturer has added in the technology, or you buy the appropriate app for it.