Open source Self-hostable free
LicenseMIT
PriceFree
UsageNo model cost
Model support
Languagesjava
GitHub stars15.1k
Last activity—
VerifiedSat Jul 04 2026 00:00:00 GMT+0000 (Coordinated Universal Time)
Verified byseed
A free, open-source local AWS emulator that exposes 68 AWS-shaped services at localhost:4566 with no account, auth token, or paid gates. It uses real Docker containers where fidelity matters (Lambda, RDS, ECS, EC2, Neptune, DocumentDB) and in-process emulation for the rest, and starts fast enough (~24ms native, ~13MiB idle) for CI and ephemeral test runs. Point the AWS CLI, SDK, Terraform, CDK, or OpenTofu at it unchanged; it is a drop-in replacement for LocalStack Community (whose free tier sunset in March 2026).
Strengths
- Drop-in AWS API compatibility; existing SDK/CLI/Terraform/CDK workflows point at localhost:4566 unchanged
- Free and MIT-licensed with no auth tokens or feature gates
- Real Docker execution for fidelity-critical services (Lambda, RDS, ECS, EC2, Neptune, DocumentDB), not shallow mocks
- Fast native startup and low idle memory suit CI and test pipelines
Tradeoffs
- AWS-only; emulates no other cloud (GCP/Azure)
- Docker-backed services require the Docker socket, adding a runtime dependency
- Newer than LocalStack, with a narrower ecosystem of surrounding tooling