Picture set: chosen by Haylee Wilson M.S. CCC-SLP.
Symbols: the Mulberry Symbols are copyright Steve Lee, and the emoji images are by OpenMoji, the open-source emoji and icon project. Both are shared under the CC BY-SA 4.0 license. Symbols you add to a card are saved as they are, unchanged.
Emoji on the starter decks are drawn by your device’s own emoji font.
Everything else, including Chirp the bird and the games, was made for Chirp Cards by Prosper Donkey.