Hi! So I've made a little Android app called Zodiac Crypt to help decode the 340-character cryptogram. It is basically a simple tool for symbol substitution with some features like search, checkpoints to remember promising results and export as an image to be able to share it. I've been trying to solve the puzzle myself for quite some time but didn't succeed. Hopefully the app will be helpful to anyone who tries to decode the cipher.
Google play:
https://play.google.com/store/apps/details?id=com.deakishin.zodiac
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Update:
Now Zodiac Crypt lets you also solve ciphers created by other people and create your own cryptograms.

