When it comes to smart contract compatibility, Arbitrum and zkSync offer different levels of support. Arbitrum is fully compatible with the Ethereum Virtual Machine (EVM), allowing developers to deploy existing Ethereum smart contracts with minimal modifications. This compatibility extends to development tools and languages such as Solidity, making it easy for developers to transition their applications to Arbitrum. zkSync, on the other hand, while offering EVM support, initially required some modifications to smart contracts due to its reliance on zero-knowledge proofs. However, zkSync 2.0 aims to provide full EVM compatibility, simplifying the process of porting Ethereum dApps to zkSync. Both platforms are working towards seamless integration with Ethereum’s ecosystem, but Arbitrum currently offers a more straightforward path for developers looking to leverage their existing Ethereum contracts without significant changes. zkSync’s evolving support for EVM compatibility promises future ease of use, particularly a