@creaket
They use a proprietary format only readable by the Monokakido Dictionaries app. There are people that have reverse engineered it such as some people on the freemdict forum and a program to dump the data here https://github.com/stephenmk/monokakido (fork). As far as I know the underlying format is just html/css underneath. You would need to dump the data and convert it to a useable format such as MDict or Yomichan. https://github.com/stephenmk/jitenbot can take a dump of Shinmeikai 8 and Daijirin 4.0 and convert it to Yomichan.
Comments - 2
creaket
shoui520