Zero21 Solitaire is an Android app developed by Zynga (699 8th Street, San Francisco. CA). Others apps created by Zynga are: Onnect, Cashier 3D, Tangle Master 3D, Golf Rival, Words With Friends 2, Spades Plus.

Zero21 Solitaire first became available on 07 Aug 2019. It is estimated that Zero21 Solitaire has been downloaded between 5000000 and 10000000 times from the Play Store.