Welcome to help.semmle.com

CodeQLCodeQL is a variant analysis engine allowing product security teams to quickly explore code to find zero-days and variants of vulnerabilities.

Learn to write CodeQL queries

CodeQL training and variant analysis examples

Exploring CodeQL queries

CodeQL language and library references

Languages and frameworks supported by CodeQL & LGTM analysis

LGTMLGTM is the platform for delivering the variant analysis results, combining deep semantic code search with data science insights to help developers ship secure code.

Administrator help

System architecture (PDF)

Installation and upgrade guide (PDF)

System requirements (PDF)

What is CodeQL? It's the new name for applying the QL language to codebases.

For information on other products, see Discontinued products.