NookBook - Animal Crossing is a free iPhone app developed by Azusa Pacific University Computer Science. It is an educational and reference program that serves as a Critterpedia for Animal Crossing New Horizons.

With NookBook, users can quickly search for fish and bugs in the game and access information about their price, seasonality, and where they can be found. This makes it easier for players to keep track of the critters they have already found and those they still need to catch.

The app also offers sorting options, allowing users to sort the critters by price and in alphabetical order, making it convenient to find specific critters.

Overall, NookBook - Animal Crossing is a useful tool for Animal Crossing New Horizons players who want to enhance their gaming experience by keeping track of critters and accessing relevant information.

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