The Open Source Stack for Onchain Developers
Whether you are launching your first blockchain application or already running an institutional-grade platform, our open source tools give you everything you need to Develop, Secure, and Operate at the industry's highest standards.
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Develop
Contracts Libraries
Accelerate development with production-ready building blocks you can trust. Use the gold standard smart contract libraries powering nearly every onchain application.
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Contracts Wizard
Configure and generate smart contracts in seconds—pick your standard, toggle the features you need, and export the code straight to your development environment.
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Upgrades Plugins
Ship upgradeable contracts with confidence using Hardhat and Foundry plugins that automate proxy deployments, enforce safety checks, integrate onchain verification, and more.
Explore Upgrades Plugins →
Contracts MCP
Develop secure smart contracts that follow OpenZeppelin standards with AI. Enable the MCP server in your favourite AI assistant to automatically enforce security best practices at every prompt.
Try Contracts MCP →
UI Builder
Spin up a front end for any contract call in seconds. Select the function, auto-generate a React UI with wallet-connect and multi-network support, and export a complete app.
Try UI Builder →
Secure
Safe Utils
Never sign a malicious multisig transaction again. With Safe Utils, you can verify Safe transaction hashes before you sign.
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Access Control
Define role-based permissions with multi-level hierarchies and granular admin controls—ideal for DAOs, multisigs, and custom governance.
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Join the OpenZeppelin Community
Every OpenZeppelin tool is built in the open and driven by our global community of developers. Your feedback, bug reports, and code contributions help the whole industry move faster and more securely.
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