RainbowKit is fast and free web3 wallet integration toolkit that enables dapp developers an easy way for users to connect their wallet to a decentralized applications frontend user interface.  Developers that use RainbowKit give dapp users the luxury of choosing their favorite wallet, and is the wallet onboarding toolkit preferred by popular web3 teams including Zora, Showtime, the Ethereum Name Service (ENS), and the Optimism Bridge. Compared other wallet toolkits, RainbowKit lets developers customize the user experience with custom themes, wallet lists, chains, and connect buttons.