*iOS7, 4inch display supported.*
*On iOS7, deleting group, swiping group cell direction is completely opposite direction from previous iOS.
Simple app making group at your "default" contacts source on your device. This app is good for person who use "Contacts" basically, and just needs group function.
Using iOS5 new function, easy to use. Tapping "New" makes new group, Tap a group name and then select the member. Swipe to delete, Long press to rename.
Even an exchange account like gmail (Gmail new account by exchange access is no longer available.) , you can make groups on your device at "Contacts". (It will not refrect to exchange however.)
How to make groups for gmail account.
Changing devices contacts default account to Gmail is required.
From Setting > Mail, Contacts, ... >Contacts >Default Account, change the default account to Gmail account. if you set it to iCloud account, you can edit iCloud account contacts group.