I am using Aedict 2.9 because I want an open source Japanese dictionary which works even when offline.

However, recently, Aedict 3 has switched to a proprietary model it seems, and I would like to stick to open source.

Apart from sticking with Aedict 2.9 forever and maintaining it for myself as a fork, what other open source options are there?


  • Open source
  • Runs on Android
  • I can look up a Japanese word, and it shows the definition in English.
  • English to Japanese not strictly necessary
  • I don't know why there's still no answer. Maybe you've not been clear concerning your requirements (functionality etc)? Can't hurt to edit that in, as in a side-effect your question pops up on page 1 then (activity) :)
    – Izzy
    Commented Jun 18, 2014 at 14:11
  • How could an open source app turn into a proprietary app? That's not possible by the definition of open source.
    – Turion
    Commented Mar 6, 2015 at 15:33
  • 1
    @Turion The copyright holder doesn't have to abide by the terms of the open source license, so they can make a new closed source version.
    – mic
    Commented Aug 7, 2019 at 13:13

2 Answers 2


You'll find that QuickDic has an excellent interface, works offline and you can download English-Japanese and lots of other dictionaries, which are generated from http://wiktionary.org.

In general, if you're looking for open source android apps, you should look on F-Droid.


Akebi Japanese Dictionary


  • Search for Kanji and words and define them in English
  • English to Japanese search
  • Offline

I don't see why it wouldn't be open source, because it has:

  • No DRM

Because it just makes everyone angry!

  • No Ads

Because they kill battery life!

It's ambiguous whether it's maintained. The last update was in March 7, 2014. Still, the app developer replies to recent comments.

  • It is not open source. This is a central requirement.
    – Nicolas Raoul
    Commented Jan 5, 2015 at 1:16

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