floci
Light, fluffy, and always free - AWS Local Emulator
The Lens
Floci is a drop-in replacement for LocalStack that's actually free. This matters because LocalStack is sunsetting its free community tier in March 2026.
Floci starts in ~24ms, uses ~13 MiB of memory, and the Docker image is ~90 MB vs LocalStack's ~1 GB. It runs on port 4566 (the same port LocalStack uses), so switching requires zero code changes. Built in Java with Quarkus, compiled to a native binary via GraalVM.
MIT licensed. Already supports CloudFormation, Step Functions, DynamoDB Streams, Kinesis, Cognito, KMS, Secrets Manager, EventBridge, CloudWatch, API Gateway v2, and more.
The catch: it's new and playing catch-up on AWS service coverage. LocalStack has years of edge cases handled. If you use an obscure AWS service, Floci might not emulate it yet. And 'no auth token required' means no telemetry, but also no commercial support if things break.
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Free vs Self-Hosted vs Paid
fully freeFully open source under MIT. No paid tier, no auth token, no usage limits. Unlimited CI/CD usage. The explicit counter-positioning to LocalStack's paid pivot is the entire point of the project.
Free. Forever. That's the whole pitch.
License: MIT License
Use freely, including commercial. Just keep the license.
Commercial use: ✓ Yes
About
- Owner
- Hector Ventura (User)
- Stars
- 4,889
- Forks
- 343