cordova

The issue is that because Crypton does crypto with JavaScript in the web view of a Cordova app, it needs to not be stupendously slow.

This has meant some work for the Cordova iOS team to get the WKWebView working.

Nope Cordova over all is not that bad, I was that bad of a programmer though haha.

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.

Making a half decent app in Cordova for some classes was the hardest I have worked at problem solving stuff in programs.

Also, outside the scope of Cordova apps, Node.js uses OpenSSL rather than /dev/urandom for their crypto.getRandomBytes() implementation, so I don't really trust it in that context.

The default iOS web view available for Cordova apps, up until iOS 8, was the UIWebView which is well known for not having access to a JIT (like Nitro in mobile Safari).

Even this will work through a cordova style wrapper, but I would really not recommend it, since you can use a much faster and accurate native OpenCV on android.

I initially had Facebook and Google logins, but since its a meteor app there is a less than desirable user flow (it opens a Cordova browser which looks awful and possibly even looks fake).

It is finally at a stage where it can be used, but some of the changes Cordova had to make to get it working, plus some differences in WKWebView's API, mean some changes had to be made to both Crypton and Encryptr to get it all to work.

Yep, this is why I prefaced my statement with "outside the scope of Cordova apps".

Then it would be to react what Intel XDK is to Cordova/Phonegap.

I believe that's referring to Xamarin and Cordova, which are now built into VS2015.

Our current stack is Node.js / Rails / Angular.js / React.js / Postgres / AWS / Cordova.