With Stardew Valley Journal, you can see information about all in-game items, their prices, villagers thoughts on them, and other useful information such as their pricing (including artisan items!) and what recipes they can be used in. You can also add items to a list of favourites to enable you to access them quickly.
The app also helps you keep track of items youve put in a bundle, caught, grown, shipped, as well as items youve added to the museum.