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Robin Hood Bingo is powered by Dragonfish and is part of the Netboost / Tarco network that also includes Gossip Bingo and Sugar Bingo. They used to have a welcome offer that was purely bingo bonus but this has now been replaced with one that includes slot spins and is more in line with (but still better than) the rest of the network.
Robin Hood Bingo is a more attractive proposition than its sister sites for two reasons (not counting the fun design). One is the aforementioned more generous welcome offer, and the other is that it is the only one of the group to have a mobile app which is available for Android as well as for iOS. Incidentally, if you are looking for the Robin Hood Bingo app in the App Store do make sure you have the right one as there are at least two with that name.