There is a new app offering online and offline audio guiding for all interested travelers.
Inside you will find several tours with descriptions of different highlights and corresponding audio guiding. A map with the location of highlights, and some recommendations on bars, restaurants and shopping places according to your location.
Also information on events and festivals happening around.
The guide is free but requires in-app purchases.
So basically one tour (which will for example cover Tbilisi old town) will cost you 3.99USD and a subscription for all 5 tours 14USD.
Honestly we haven't purchased any tours yet but believe they should be interesting.