Yes, some free slot machine apps offer the chance to win real money. These apps often have in-app purchases or advertisements that generate revenue for the developers, and they might also have a system where you can earn virtual currency or tokens by playing the free slot games.
Best overall real money slots games\n\n Best RTP on a real money slot: Mega Joker is a progressive jackpot slot with a 99% RTP and some unique bonus features.