Slither review
A focused, no-cost option for adding Solidity and Vyper analysis to CI.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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 add analysis to existing build workflows. It can run on individual files or projects using supported compilation frameworks, and its self-hosted deployment fits teams that want analysis in their own development environment. Its role is security analysis, not a complete environment for designing and developing contracts.
The analysis combines built-in detection with SlithIR, an intermediate representation used for analysis, and a Python detector API for custom analyses. Detected issues can include source-code locations, helping connect findings to the relevant code. Built-in printers expose contract information, while checklist-style Markdown export offers a report format for review. This depth is most relevant to teams that want to extend or inspect static analysis; teams seeking a visual builder or contract templates will need a different tool for those tasks.
Slither is open source under the AGPL-3.0 license and is available at no cost. The project integrates with CI workflows and builds using Hardhat or Foundry; listed integrations also include GitHub Actions, Dapp, Brownie, and pre-commit. It is available for Linux, macOS, and Windows. Support channels are community resources and documentation, so teams that require a dedicated support channel should weigh that against their needs. Choose Slither when Solidity and Vyper security analysis, extensibility, and CI integration are priorities; look elsewhere if the central requirement is end-to-end contract development or a visual authoring workflow.
Slither pros and cons
- 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
Slither fact sheet, pricing and score →
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