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Foundry is a Rust-based toolkit for building and testing Ethereum smart contracts, combining a compiler (Forge), transaction tool (Cast), local development node (Anvil), and Solidity REPL (Chisel). It emphasizes speed, modularity, and cross-platform support for Solidity and Vyper development.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | foundry-rs/foundry |
| Owner | foundry-rs |
| Primary language | Rust |
| License | Apache-2.0 — OSI-approved |
| Stars | 10.5k |
| Forks | 2.6k |
| Open issues | 435 |
| Latest release | v1.7.1 (2026-05-08) |
| Last updated | 2026-07-08 |
| Source | https://github.com/foundry-rs/foundry |
What foundry is
Foundry provides modular Rust components for the Ethereum development lifecycle: Forge handles contract compilation, testing, fuzzing, and deployment; Cast offers EVM interaction and RPC querying; Anvil runs a local EVM node with forking capability; Chisel provides interactive Solidity evaluation. Architecture is built on the Alloy library for Ethereum primitives.
Get the foundry source
Clone the repository and explore it locally.
git clone https://github.com/foundry-rs/foundry.gitcd foundry# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Requires Rust toolchain installation; adds compilation step and dependency management overhead compared to JavaScript-based tools like Hardhat.
- Learning curve steeper for teams unfamiliar with Rust or CLI-driven development; documentation assumes some Ethereum and Solidity proficiency.
- Fuzzing and advanced testing features are powerful but require deliberate test design; poorly written fuzz tests may not surface vulnerabilities effectively.
- Integration with external services (block explorers, RPC providers) relies on Cast; verify RPC endpoint reliability and rate limits before production use.
- Version management via foundryup; pin versions in CI/CD pipelines to avoid unexpected behavior changes across team members.
When to avoid it — and what to weigh
- Non-Solidity/Vyper Smart Contract Ecosystems — Foundry is tightly coupled to Solidity and Vyper; unsuitable for Move, Rust on-chain, or other VM languages.
- Enterprise Support Requirements — This is a community-driven open-source project. No commercial SLA, dedicated support, or vendor backing is available.
- Windows-First Development Environment — While Foundry supports Windows, it is optimized for Unix-like systems; Windows adoption may encounter friction or undocumented edge cases.
- Graphical IDE Preference — Foundry is CLI-centric. Teams requiring visual contract deployment, debugging GUIs, or integrated IDE plugins should evaluate alternatives like Hardhat or Remix.
License & commercial use
Dual-licensed under Apache License 2.0 (primary) and MIT license. Both are OSI-compliant, permissive licenses. Contributions are automatically dual-licensed unless explicitly stated otherwise.
Apache 2.0 and MIT are permissive OSI licenses that explicitly permit commercial use, modification, and distribution without royalty or additional licensing restrictions. No commercial entity owns Foundry; use is unrestricted provided license terms are acknowledged. However, no vendor guarantees, support contracts, or indemnification are included; users assume all liability and maintenance burden.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Strong |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
Foundry itself does not execute untrusted code; it is a compilation and testing framework. Key risks: (1) Private key exposure via environment variables or scripts—apply standard OS-level secrets management. (2) RPC endpoint compromise affects transaction reliability—use trusted, rate-limited providers. (3) Fuzzing and testing do not guarantee contract soundness—formal verification and external audits remain necessary. (4) Anvil's local fork mode does not replicate all mainnet consensus rules; use with caution for state-dependent contracts. Review SECURITY.md for release verification procedures.
Alternatives to consider
Hardhat (JavaScript/TypeScript)
Similar feature set (testing, debugging, local node) with lower barrier to entry for Node.js teams; larger ecosystem of plugins; IDE integration simpler. Trade-off: slower execution and higher memory footprint.
Truffle (JavaScript/Solidity)
Mature ecosystem, extensive Solidity debugging, and native Windows support. Trade-off: declining community adoption, slower builds, less active maintenance than Foundry.
Remix (Web-based IDE)
Zero-setup visual environment for contract development, testing, and deployment. Trade-off: limited scalability for complex projects, no command-line integration, slower for large test suites.
Build on foundry with DEV.co software developers
Ready to accelerate Solidity testing and contract development? Our Ethereum engineering team can help you migrate from Hardhat, establish best practices with Foundry, and integrate it into your CI/CD pipeline.
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foundry FAQ
Is Foundry production-ready?
Can Foundry replace Hardhat entirely?
What is the performance difference vs. Hardhat?
How does Foundry handle contract dependencies?
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Evaluate Foundry for Your Ethereum Development
Ready to accelerate Solidity testing and contract development? Our Ethereum engineering team can help you migrate from Hardhat, establish best practices with Foundry, and integrate it into your CI/CD pipeline.