Floci emerges as free open-source AWS emulator after LocalStack ends community edition

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Floci is a free, MIT-licensed local AWS emulator that runs services like S3, Lambda, DynamoDB, and SQS inside Docker, requiring no account or authentication token. The tool gained relevance after LocalStack retired its open-source Community edition in March 2026, when version 2026.03.0 began requiring a paid account token to run. Built on Quarkus and compiled as a GraalVM native binary, Floci claims a roughly 24-millisecond startup time and 13 MiB idle memory footprint, significantly lighter than LocalStack's reported figures. Lambda functions execute inside real Docker containers using genuine AWS runtime images, and services such as API Gateway, Cognito, and IAM-authenticated databases are included without paywalls. Teams using LocalStack in local development or CI pipelines can migrate by replacing a single image reference in their existing Docker Compose configuration.

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