Floci provides a lightweight alternative to LocalStack for local AWS development and testing. The emulator supports the same port and endpoint conventions as LocalStack Community Edition, meaning existing development configurations and test suites work without modification. Supported services include S3, SQS, DynamoDB, RDS, ElastiCache, API Gateway, Cognito, IAM, STS, Kinesis, KMS, and over twenty additional AWS services that cover the most common development workflows.
The performance and resource advantages are substantial. Floci's Docker image weighs approximately ninety megabytes compared to LocalStack's roughly one gigabyte. Cold start time is twenty-four milliseconds with approximately thirteen megabytes of idle memory consumption. For development teams running emulators on developer laptops or in CI/CD pipelines where container size and startup time directly impact iteration speed, these improvements translate to faster feedback loops.
Released as a free open-source project with no authentication tokens required unlike LocalStack's commercial features, Floci removes the friction of local AWS development entirely. The tool targets teams that need AWS service emulation for integration testing without the resource overhead or licensing considerations of larger emulation platforms.
