The Open Source Stack for Onchain Builders
Whether you are launching your first blockchain app or already running a
top-tier protocol, our stack
provides with everything you need to Build,
Secure, and Operate—always to the industry’s highest standards.
Build
Contracts Libraries
Accelerate development with production-ready building blocks you can trust. Use the gold standard smart contract libraries powering nearly every onchain application.
Explore Contracts →
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.
Try Wizard →
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 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.
Secure
Safe Utils
Never sign a malicious multisig transaction again. With Safe Utils, you can verify Safe transaction hashes before you sign.
Try Safe Utils →
Access Control
Define role-based permissions with multi-level hierarchies and granular admin controls—ideal for DAOs, multisigs, and custom governance.
Try Access Control →
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.
Contribute on GitHub →