Floci: The Free, Open-Source LocalStack Alternative That Runs AWS on Your Laptop (2026)

Floci launched as an MIT-licensed local AWS emulator: S3, DynamoDB, Lambda, SQS and other services run in Docker without an account or token. It is positioned as a LocalStack replacement after LocalStack closed its Community version in March 2026 and requires LOCALSTACK_AUTH_TOKEN.

• Claimed ~24 ms startup and ~13 MiB memory vs ~3.3 s and ~143 MiB for LocalStack
• Lambda runs in real Docker containers with official runtime images
• Cognito, API Gateway v2, RDS and ElastiCache are free, with no paid tiers
• Migration: swap the docker-compose image to hectorvent/floci, port 4566