Have you asked the people at SonosTube? This community is a Sonos board, I don’t think the developers are allowed to maintain a presence here, or choose not to. Most of what is discussed here is the Sonos software. 

SonosTube App still works okay here (I have just tried it), but do not use it very much - However, I’m using it on iOS (IPad). It’s still available from the Apple Store.

Yup. Contacted the developer. I got an immediate reply - we are on it. Then, nothing. And no response to a second inquiry.

I am asking other Sonos users about their experience.

It's been down for months on android in that i upgraded my phone in June and Sonostube reverted to free version upon transferring the app to my new phone. I contacted the developer over and over again asking them to restore my purchase and got nothing back other than the automated response. I put a review on Google Play slating them for not responding and since then the app has been removed from Play Store

Just now today found out my SonosTube wasn't working. Haven't been using it at all for quite long. After searching on Play store without luck I came here. Just sent them a message, 48h they have to reply. Their words 

I tried to send e-mail to sonos but its impossible…

Sonostube doesn't work :(

Sonos has nothing to do with SonosTube . Sonos has their own app, SonosTube is a completely different company. 

SonosTube is still working with Sonos speakers, but that’s for those that may have iOS devices. It seems the App developers have removed their App from the Android/Google App Store, not sure why, or if it’s just a temporary situation. It’s still available via the Apple App Store and working fine here.

Probably best to speak to the developer (Frontier App).

SonosTube alternatíva:

AirMusic with YouTube.

(I use with Vanced yt., ) (Delay 3-4 sec.)

AirMusic not free, but you can try for free, and not expensive the pro version. (Less than 10€ lifetime.)

I hope you will love it!

Dew

SonosTube app update on Google Play Store a couple of days ago, seems like it is running again, Yay!