BlockApps says:
Customized, permissioned private Blockchain ledger to your specifications. Based on Turing-complete Ethereum standards, your Blockchain has full Smart Contract support built-in.
How can BlockApps be used with Ethereum? How can these customized, private blockchains be used with Ethereum? How can contracts in a private BlockApps chain invoke a contract on Ethereum?
CPO of BlockApps here.
BlockApps exposes a REST API and Javascript and Mobile SDK to Ethereum "compliant" blockchains. This includes the public Ethereum network.
Basically you write an app with bloc [ https://github.com/blockapps/bloc ] and/or blockapps-js [ https://github.com/blockapps/blockapps-js ] and can deploy it to a developer sandbox, private / consortium network or the Ethereum livenet just by changing the API url that your app is pointed at.
