Pysa vs Semgrep Code

Pysa is a free, open-source Python static analysis tool that uses taint analysis to identify potential security issues. It follows data from configured sources toward dangerous sinks, such as user-controlled request data reaching an eval call. Users configure sources, sinks, features and rules in taint.config, and annotate code with .pysa model files; built-in and common Python libraries have prewritten models and rules. Sanitizer models describe data that should lose taint, including function parameters and return values. Pysa analyzes the target repository and directories in the configured search_path, but not dependency source outside that scope. When it cannot access a function’s source, it assumes the return value retains taint, which can lead to false positives. Analysis may freeze on similarly sized projects if the machine lacks enough memory. The quickstart installs it with pip install pyre-check in a Python virtual environment. Pyre supports the Language Server Protocol, and a VSCode extension connects to a running server. SAPP can ingest results for viewing and filtering in a local web UI; a GitHub Action can run Pysa in CI and show findings in GitHub’s Security code scanning UI. Pysa requires Python 3.9 or later and relies on type information from Pyrefly. The project says it can analyze codebases with millions of lines. Its repository is MIT-licensed; the Pyre repository was archived on June 26, 2026, and says Pysa moved to its own repository.

Semgrep Code is a cloud-based static application security testing product for finding vulnerabilities in source code and helping developers address them. It combines deterministic analysis for issues such as XSS and SQL injection with AI analysis aimed at complex flaws, including IDOR and business logic vulnerabilities. Pull requests can carry tailored, step-by-step remediation instructions, and the product supports 35 programming languages. Semgrep lists integrations with GitHub, GitLab, Bitbucket, Jenkins, CircleCI, Azure and Buildkite, plus VS Code and IntelliJ extensions and Slack, email and webhook notifications. The Free Edition includes Code and Supply Chain, with scanning for up to 10 repositories and a limit of 10 contributors. Teams supports up to 500 private repositories; Enterprise has no repository or contributor limit. For local or fully CI-based scans, code stays on the user's computer or CI environment; opting into AI processing sends part of a file containing a finding to a model. The Free Edition costs nothing. Teams — Code is listed at $30 a month.