LocalStack just got a free replacement that starts 250x faster.
It's called floci.
A drop-in AWS emulator built with Quarkus Native that boots in 24ms, idles at 13 MiB, and passes 1,925 of 1,925 AWS SDK compatibility tests.
It lets you run AWS-style services locally on your own machine for development, testing, and CI.
No AWS account.
No auth token.
No paid feature gates.
No surprise cloud bill.
Here's what makes it different from LocalStack:
→ 24ms startup vs ~6,000ms on a typical emulator
→ 13 MiB idle memory vs ~250 MiB for the competition
→ 289 Lambda invocations per second with real Docker execution
→ ~90 MB Docker image size, fits on the smallest CI runners
→ Per-account isolation: dev, staging, and test on a single instance
Basically, Floci gives developers a local AWS cloud that is fast, free, open-source, and built for people who actually ship.
AWS testing just got a lot cheaper.
floci.io/aws/