I have used a number of apps, more out of curiosity about what they offer than real necessity. Once out of the area close to the cathedrals in both Lisbon and Porto, the Central route is well marked, including where the route might split into different options.
When I walked to Fatima and then from Tomar to SDC in 2022, I used OSMAnd+, and used a browser to access Gronze and the Booking.com app when I needed to. The maps for Portugal and Spain from OSM have the the Camino routes already marked up as a map layer that can be enabled.
Gronze now has a map app for the Android OS using map box maps, but it doesn't seem to cover all the alternative or complementary paths. It gives basic accommodation information in the app, but needs a data connexion to access more complete information about each property. It has reasonable integration with Booking.com through the Gronze website.
I used Wisepilgrim as well this year. It has good coverage of most routes to SDC, but not to Fatima, which is why I didn't use it so much last year. It is probably the best all rounder of the several camino specific guide apps I have tried, and doesn't need a data connexion, but will use one if it is there. It has many useful features integrating it with what I think are the other must have apps - WhatsApp and Booking.com. It doesn't cover some of the complementary routes, but does have a more complete coverage than the other Camino specific guides I have tried. Only OSMAnd+ has more complete route coverage.
I did look at others, and there are some pretty solid apps out there. I found some more cumbersome to use, and others just focus on the
Camino Frances at this stage of their development. Only you will be able to tell if the way an app works suits you.