https://en.wikipedia.org/wiki/Yo_(app) https://en.wikipedia.org/wiki/Yo_(app) says the company has shut down but the app still works (not too surprisingly given

https://en.wikipedia.org/wiki/Yo_(app) https://en.wikipedia.org/wiki/Yo_(app) says the company has shut down but the app still works (not too surprisingly given its simplicity) with occasional minimal maintenance by the founder.