In musing.io's "introduceyourself" post (link below) on steemit.com it states,
"We plan to open-source the platform once there is clear developer interest. Open-source is the future of blockchain tech and is critical to true decentralization."
I believe we will see someone make apps for Android and maybe iPhone once musing.io is open source.
Source:
https://steemit.com/introduceyourself/@musing/introducing-musing-io-a-decentralized-