By installing one of the following Dict Apps, JAccent or Takoboto respectively, you can turn your Android, iPhone or iPad into an electronic Japanese Dictionary. Of course “Offline Workable”. However older Android OS always tends to display deformed Chinese characters instead of standard Japanese Kanji (常用漢字) which would be required in JLPT. To solve this problem, Android users have to manually change the interface language to Japanese. The route is: Android Setting > Device Option > Keyboard & Language > JAPANESE
JAccent is an offline workable Japanese Dictionary with accent guidance. According to the developer's claim, this Dict app:
Takoboto is an offline workable Japanese Dictionary with accent guidance. According to the developer's claim, this Dict app: