The Collins is far better imo, far more species and covers the whole of Europe, whereas the BirdGuides app only covers Northern Europe
Edit: ooooh, now I got it. I thought you were talking about comparing the collins app to the collins book for a second. Never mind my text further down... I've also got the Birds of Northern Europe app, it's far worse, the only thing that was better were the quite detailed descriptive texts, that now somehow got cut on many species.
The app covers over 700 species. I think that's about the same amount as covered by the book.
The illustrations are equally good, the added detail to the maps and the possibility to play the bird calls is fantastic.
IMO, the book is only better if you don't own an iPad and if you are someone who absolutely needs the haptic feeling of a book.
Edit: @JohnFleet:
Touch the search bar, enter e.g. "stilt sand" then touch the golden "Text search for "stilt sand"". A rounded rectangle appears directly below the search bar, so you can see that the text search is active. You just have to get rid of the keyboard, so press the blue "ready" in the low right corner.
You should now get to the search results, as there is only the Stilt Sandpiper as a possible result, you get that species as the only result. Touch the little pictures of the sandpiper or use the slider on the bottom for a detailed description. Voila.
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