OpenMask serves as a web-based wallet for The Open Network (TON) and acts as a gateway for decentralized applications (dApps), offering top-tier wallet capabilities alongside tools for developers. Designed as a modern alternative to MetaMask, it features a functional stack and includes an in-page TON Provider that aligns with Ton Connect 2.0, allowing users to switch effortlessly between the Mainnet and Testnet with just a click. By utilizing a secure key vault, OpenMask provides users with client-only Web 3 access, supporting multiple wallets, incorporating Ledger hardware for added security, and offering biometric authentication for easy and safe logins. Users can effectively manage tokens, Jettons, and NFTs, while also simplifying their interactions with proxy-hosted TON Sites. As a Web 3.0 application, OpenMask generates passwords and keys directly on the user's device, ensuring that they maintain complete control over access and permissions. Additionally, developers can take advantage of a detailed RPC API, as well as sophisticated modules for connection and contract deployment, enhancing their ability to build and interact with the TON ecosystem. Overall, OpenMask not only prioritizes user security and convenience but also fosters a robust environment for developers seeking to innovate within the TON framework.