iCalculator for Records, History

Features:
1 Auto sync calculator history from iPhone to iPad or from iPad to iPhone
2 Login Facebook to sync iPhone and iPad

Functions:
1 History: record and check calculator history in chronological order
2 Step: auto display calculating steps and expression to check its correctness, for example, 3+2+1=
3 Statistics: auto list all records each day, delete those useless ones by one key or one by one
4 Replication: long press calculating result to copy
5 Skin: provide various skins for free