1 self-guided audio tour in Bilbao, Spain, 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 Bilbao takes about 5 h 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 1 audio tour in Bilbao: 22 min of narration across 12 stops and 18 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. One route is longer than 12 km: split it over several days or use public transport between some stops.
In one day you can do Bilbao: the City of Iron That Reinvented Itself with a Titanium Museum (~5 h): about 5 h of touring with audio and walking. That covers every Trevurs tour in Bilbao.
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.