Spades Credits
Court cards
The Jacks, Queens and Kings use the English-pattern court figures drawn by Dmitry Fomin, released under CC0 1.0 (public domain) on Wikimedia Commons. Thank you! The corner indices, the number cards, the aces, the jokers and the card back were made for this app.
Fonts
Playfair Display, Nunito Sans and Oswald, all under the SIL Open Font License 1.1, via Google Fonts.
Sounds
All sound effects were synthesized for this app.