Substrate Contracts UI is a sophisticated web application designed for deploying and managing WASM smart contracts on Substrate blockchains incorporating the FRAME Contracts Pallet, specifically compatible with nodes utilizing WeightV2. The platform supports ink!, ask!, and solang smart contracts, and is optimized for local development using a Substrate Contracts Node or the Contracts parachain on the Rococo Testnet. Key features include contract instantiation via two methods: “Upload New Contract Code” for first-time deployments requiring a .contract code bundle with metadata and WASM code, and “Use Existing Contract Code” for re-instantiations using in-chain code hashes and metadata. Post-instantiation, users can engage with contract messages directly via the intuitive UI. The open-source project encourages contributions, with guidelines available for developers aiming to enhance functionality or resolve issues.