LocalStack Core

LocalStack Core is the foundational Python library and runtime for LocalStack, a robust cloud service emulator that allows developers to run AWS applications and Lambdas entirely on their local machine or in CI environments without connecting to a remote cloud provider. The library underpins the LocalStack CLI and Docker container, providing the core emulation capabilities. As of the 2026.03.0 release, LocalStack has adopted calendar versioning (YYYY.MM.patch) and follows a monthly release cadence.