In theory, sure. Crypton.io itself is available on github and you could build your own server.
On the Encryptr app side, src/app.js uses window.crypton.host and _.port to specify the crypton endopint to connect to. I think the app store build of encryptr uses a crypton endopint at devgeeks.org.
You could just use (apache) cordova to roll your own build of the android app with app.js set to point to your preferred self-hosted endpoint.
YMMV.
Note: this is definitely a product at the MVP stage. The platform is capable of implementing data sharing, but that is not currently used by the Encryptr application.
Indeed, you can do this and we encourage it. We are also building a private "feed" application called "Kloak", which resembles Twitter but is private and "un-dataminable".
On the Encryptr app side, src/app.js uses window.crypton.host and _.port to specify the crypton endopint to connect to. I think the app store build of encryptr uses a crypton endopint at devgeeks.org.
You could just use (apache) cordova to roll your own build of the android app with app.js set to point to your preferred self-hosted endpoint.
YMMV.
Note: this is definitely a product at the MVP stage. The platform is capable of implementing data sharing, but that is not currently used by the Encryptr application.