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Head-to-head · Smart Contracts Software

Foundry vs Slither

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Foundry #2 in Smart Contracts Software 8.9/10 Free plan Free plan✓ 1 of 4 features Visit Foundry
Slither #8 in Smart Contracts Software 7.9/10 Free plan Free plan✓ 2 of 4 features Visit Slither

Foundry leads on 0 checks, Slither on 1, and 4 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreFoundry · 8.9/10
  • Free planboth
  • Most featuresSlither · 2 of 4

Foundry scores higher on our rubric for smart contracts software: 8.9 against 7.9 out of 10; our editors rank them #2 and #8.

On chain coverage, Foundry gives you Multi-chain where Slither offers Single-chain. Slither offers security analysis; Foundry doesn't.

Foundry is the better fit for solidity teams comfortable with command-line tools. Slither is the better fit for teams adding Solidity and Vyper analysis to CI.

  • Foundry fits best

    Solidity teams comfortable with command-line tools

  • Slither fits best

    Teams adding Solidity and Vyper analysis to CI

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Side by side

Feature Foundry 8.9/10 Visit ↗ Slither 7.9/10 Visit ↗
At a glance
Editor score 8.9 7.9
Ranking #2 in Smart Contracts Software #8 in Smart Contracts Software
Best for Solidity teams comfortable with command-line tools Teams adding Solidity and Vyper analysis to CI
Pricing model Free Free
Starting price Free plan Free plan
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted Self-hosted
Platforms Windows, macOS, Linux Linux, macOS, Windows
Support Community Community, Docs
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Foundry 1/4 · Slither 2/4
Security analysis — ✓ (best)
Visual contract builder — —
API or SDK access ✓ ✓
Contract templates Not checked yet —
Specs
Chain coverage Multi-chain Single-chain
Contract languages Multiple Multiple
Deployment targets Both Not checked yet
Our review
Pros
  • Includes build, test, debug, deploy and contract verification tools.
  • Supports fuzz and invariant tests, plus local chain forking.
  • Open-source and available at no charge on Windows, macOS and Linux.
  • Detects vulnerabilities and points to related source-code locations
  • Supports custom Python analyses through its detector API
  • Integrates with CI, Hardhat, and Foundry builds
Cons
  • Command-line workflow is less accessible than an IDE.
  • Self-hosted deployment requires developers to manage their own environment.
  • No built-in security analysis or visual builder.
  • Focuses on security analysis, not end-to-end contract development
  • Does not include a visual builder or contract templates
  • Support is through community resources and documentation
Our verdict

Foundry is an open-source toolkit from Paradigm for developers building smart contracts for Ethereum and compatible networks. Its command-line tools cover contract development from prototype through deployment: Forge builds, tests, debugs,…

Read the review →

Slither is a Python-based static analysis framework for Solidity and Vyper smart contracts. It is aimed at developers and teams who want to identify vulnerabilities and error conditions in contract code, inspect contract information, or…

Read the review →
  1. FoundrySmart Contracts Software 8.9Free plan
  2. SlitherSmart Contracts Software 7.9Free plan

Strengths and trade-offs

  • Foundry — where it wins

    • Includes build, test, debug, deploy and contract verification tools.
    • Supports fuzz and invariant tests, plus local chain forking.
    • Open-source and available at no charge on Windows, macOS and Linux.

    Where it doesn't

    • Command-line workflow is less accessible than an IDE.
    • Self-hosted deployment requires developers to manage their own environment.
    • No built-in security analysis or visual builder.

  • Slither — where it wins

    • Detects vulnerabilities and points to related source-code locations
    • Supports custom Python analyses through its detector API
    • Integrates with CI, Hardhat, and Foundry builds

    Where it doesn't

    • Focuses on security analysis, not end-to-end contract development
    • Does not include a visual builder or contract templates
    • Support is through community resources and documentation

More comparisons

All smart contracts software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update