Kastanien App is a lifestyle application developed by GrundID GmbH. It is a free app available for Android users that helps you locate chestnut trees in Berlin, Frankfurt, Bonn, Hamburg, Rostock, and Heilbronn. With this app, you can take pictures of chestnuts and share them with others.

The app also comes with a filter function that allows you to search for specific chestnut varieties, such as edible chestnuts. Additionally, you can adjust the app settings to display all trees from the Tree Cadastre. Kastanien App has been featured in Heilbronner Stimme and Radio TON.

The app uses your location to find chestnut trees near you, and the camera permission is required to take pictures of the chestnuts. The app also requires access to your SD card to process photos and save map data.