2 self-guided audio tours in Vienna, Austria, in English, Spanish, Portuguese, French, Italian. No group, no fixed schedule: start whenever you want and go at your own pace. Works offline.
Doing every Trevurs tour in Vienna takes about 4 h 45 min in total. A relaxed way to split it:
No fixed schedule: start whenever you want, skip stops, or spread a tour over several days.
The Trevurs app is free and has 2 audio tours in Vienna: 34 min of narration across 21 stops and 15.8 km of walking routes. Download them over wifi and listen offline, with no mobile data. Entry tickets to museums, churches or monuments along the way are not included. Premium, from USD 1.99, adds unlimited offline downloads, every tour and no ads.
Each tour starts at stop 1 and you go stop by stop at your own pace: pause, rewind or skip any stop. No booking and no fixed start time, and it works offline once downloaded.
In one day you can do Dark Vienna: 1914 and the End of an Empire of 50 Million (~2 h 30 min) and The Habsburgs: 600 Years of Power, Madness, and Fall (~2 h 15 min): about 4 h 45 min of touring with audio and walking. That covers every Trevurs tour in Vienna.
Trevurs is a free app for iOS and Android. There is also an optional Premium version, from USD 1.99, with unlimited offline downloads, access to every tour and no ads. It also helps keep an independent app alive.