Difference between Android 1.0 and Android 5.1.1

1. Android 1.0 :
Android 1.0 is the very first version of Android which was introduced by Google. It had some basic features including web browser support, camera support, Gmail accounts, Google maps and Youtube application. Although it does not have the official version name like further introduces versions but unofficially it is called Apple Pie. The API level in Android 1.0 version is 1. It is not used anymore in the mobile devices. It was released on 23 September 2008.

2. Android 5.1.1 :
Android 5.1.1 is the next version of Android after Android 5.1 which was introduced by Google. It has all the features of its previous versions and some new user features were added in this version. Various bugs were fixed in this version. Speed and various features were improved in this version. No new developer features were added in this version. Its version name is Lollipop. The API level in Android 5.1.1 is 22. It was released on 21 April 2015.

Difference between Android 1.0 and Android 5.1.1 :

S.No.	ANDROID 1.0	ANDROID 5.1.1
1.	It is the first version of Android.	It is the next version of Android after Android 5.1.
2.	It is predecessor to Android 1.1.	It is predecessor to Android 6 and successor to Android 5.1.
3.	It was released on 23 September 2008.	It was released on 21 April 2015.
4.	The API level in Android 1.0 version is 1.	The API level in Android 5.1.1 version is 22.
5.	It has 0 % android market share.	It has 11.5 % android market share.
6.	It does not have official version name.	It has official version name like its other previous versions.
7.	It has unofficial version name ‘Apple Pie’.	It has official version name ‘Lollipop’.
8.	It had limited basic features like google maps, gmail, web browser, camera and youtube.	It had all features of previous versions and some new user features were added in this version.
9.	It had various bugs and issues.	Several bugs and issues were fixed in this version.
10.	It was a slow version.	Speed was improved in this version.