They haven't made an announcement on whether they would be releasing an smartphone app or not.
Please note that musing.io interface is very simple. You can use it very easily from you smartphone internet browser without any trouble.
Please let this not discourage you from using musing.io. Who knows that we might have an announcement from the musing team in future :-)
I for one am looking forward to that release. Hope it will be as minimalistic and simplistic like the one we are currently using.
I do encourage you to join their Discord server if you are still not a member to get updates and possible dates if and when that is released: https://discord.gg/zxw34xj
Can't say specifically.
Musing have not released an app for smartphones but it would be a good development if they can release their apps for smartphones so that mobile users can have access to this platform much easier directly from their mobile phone....
Musing.io have not released an app for smartphones but i do not think that should be a huge priority because
the musing.io is a platform that is well designed for all kinds of users including mobile users,the website is easy
to access from any phone or computer and the features of the website is easy to use on any form of device and it is perfectly well structured and easy to understand...