Floci open-sources an AWS emulator: 13 MiB, 45 services, sub-second boot. No Docker. Replaces LocalStack Pro.

A team open-sourced Floci, an AWS emulator that boots 45 services in under a second with 13 MiB of memory. The single Go binary replaces LocalStack Pro and Docker-based dev environments entirely.

Key facts

13 MiB memory footprint, 200x less than Chrome tab

45 AWS services emulated in single Go binary

Sub-second cold start, no Docker required

Zero dependencies: no Docker, Python, or Java runtime

Pre-built binaries for Linux, macOS, Windows

Key Takeaways

Floci open-sources an AWS emulator: 13 MiB, 45 services, sub-second boot.

Replaces LocalStack Pro.

What Floci Does

Floci is a single Go binary that emulates 45 AWS services locally, including S3, Lambda, DynamoDB, SQS, SNS, IAM, CloudFormation, and Step Functions. It requires zero dependencies — no Docker daemon, no Python runtime, no Java VM.…