Ikue is an open-source, offline, material design Japanese dictionary application that aims to be fast, intuitive, and lightweight.

Features:

100% Offline
You don't need any internet connection to use the dictionary. The only time you need an internet connection is when you want to send feedback!

Material Design
Follows the Material Design guidelines to offer an intuitive, and pleseant user experience that feels familiar to Android users.

Open Source
See the code here: https://github.com/luke-c/Ikue

All-In-One Search Bar
Universal search bar. You can search in any format you want: Japanese, Romaji, or English.

Word of the Day
See a new random word every day on the home screen. You can also share it with your friends.

Favourites
You can favourite entries to look back at later. You can view a list of all your favorites in the "Favorites" tab.

History
Entries you view are automatically added to your history. You can view these in the "History" tab.

Detailed Entry Information
You can see alternative readings, frequency information, dialect, field of use, and more.

Wildcard Search Support
The search has support for the 0 or many characters wildcard operator * and the ? operator for 1 exact character match. For example: 食* would get every word starting with the "食" character. 食? would get every wordthat starts with "食" and has exactly 1 following character.

No ads
This is a completely free, open-source application, with no strings attached.

No permissions needed
Absolutely no permissions are needed or used by the application. You can rest easy knowing the app isn't doing anything you don't know about!

The dictionary data is provided by the JMdict project, made by the Electronic Dictionary Research and Development Group, with special thanks to Jim Breen and other contributors.