Difference between Android 1.0 and Android 2.1

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 counts, 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 2.1 :
Android 2.1 is next version of Android after Android 2.0.1 which was introduced by Google. It had all the features of its previous versions and some new features were also added in this version. This version was quite similar to its previous version Android 2.0 and Android 2.0.1. No major features were added in this version. Only user interface was updated. This version had a version name. Its version name is Eclair. The API level in Android 2.1 is 7. It was released on 12 January 2010.

Difference between Android 1.0 and Android 2.1 :

S.No.	ANDROID 1.0	ANDROID 2.1
1.	It is the first version of Android.	It is the next version of Android after Android 2.0.1.
2.	It is predecessor to Android 1.1.	It is predecessor to Android 2.2 and successor to Android 2.0.1.
3.	It was released on 23 September 2008.	It was released on 12 January 2010.
4.	The API level in Android 1.0 version is 1.	The API level in Android 2.1 version is 7.
5.	It is not used anymore in mobile devices.	It is also not used anymore.
6.	It does not have official version name.	It has official version name like its previous version.
7.	It has unofficial version name ‘Apple pie’.	It has official version name ‘Eclair’.
8.	It had limited features like google maps, gmail, web browser, camera and youtube.	It had all the features of Android 2.0 and Android 2.0.1 but some new features were added in this version.
9.	It did not have good user interface.	It had updated user interface than its previous versions.