March 22, 2026

Floci: The Free Local AWS Emulator That's 137x Faster Than LocalStack

Floci is a free, open-source local AWS emulator that just hit the front page of Hacker News — and for good reason. It's everything LocalStack's community edition used to be, before they sunset it in March 2026 with auth tokens, frozen security updates, and no CI support.

Named after floccus — the cloud formation that looks like popcorn — Floci is the no-strings-attached alternative indie hackers have been waiting for.

The Numbers Are Absurd

Let's talk performance. Floci doesn't just beat LocalStack — it obliterates it:

Metric	Floci	LocalStack
Startup time	~24ms	~3.3s
Idle memory	~13 MiB	~143 MiB
Docker image	~90 MB	~1.0 GB
Auth token	No	Yes (since March 2026)
CI/CD support	Unlimited	Requires paid plan
License	MIT	Restricted

That's 137x faster startup and 11x less memory. For indie hackers running on constrained hardware or trying to keep CI costs down, this matters.

20+ AWS Services, No Gatekeeping

Floci supports more services than LocalStack's free tier ever did:

API Gateway v2 / HTTP API — full support
Cognito — LocalStack: nope
ElastiCache (Redis + IAM auth) — LocalStack: nope
RDS (PostgreSQL + MySQL + IAM auth) — LocalStack: nope
S3 Object Lock — full COMPLIANCE/GOVERNANCE modes
DynamoDB Streams — complete implementation
IAM (users, roles, policies, groups)
STS — all 7 operations
Kinesis (streams, shards, fan-out)
KMS (sign, verify, re-encrypt)

408 out of 408 AWS SDK tests passing. That's not a typo.

Get Running in Seconds

Create a docker-compose.yml:

services:
  floci:
    image: hectorvent/floci:latest
    ports:
      - "4566:4566"
    volumes:
      - ./data:/app/data

Then just run:

docker compose up

All services are available at http://localhost:4566. Point any AWS SDK at it:

export AWS_ENDPOINT_URL=http://localhost:4566
export AWS_DEFAULT_REGION=us-east-1
export AWS_ACCESS_KEY_ID=test
export AWS_SECRET_ACCESS_KEY=test

aws s3 mb s3://my-bucket
aws sqs create-queue --queue-name my-queue
aws dynamodb list-tables

Credentials can be anything — no AWS account needed.

Why This Matters for Indie Hackers

Local development of AWS services used to be painful. You either paid for LocalStack Pro, dealt with the community edition's limitations, or — worse — tested directly against production.

Floci changes that equation:

No AWS bills during development. Test Lambda functions, S3 uploads, DynamoDB queries — all locally. Your wallet stays happy.

CI/CD without limits. Run integration tests on every PR without paying for LocalStack's enterprise tier. Unlimited CI minutes.

Security updates that keep coming. LocalStack froze community edition security patches. Floci is MIT licensed and actively maintained.

Native Binary for Sub-Second Startup

Floci ships as a native binary — ~40MB, starts in milliseconds. No JVM warmup, no container overhead if you run it bare metal. Perfect for:

Local development laptops — instant feedback loops
CI pipelines — spin up test infrastructure in milliseconds
Resource-constrained environments — 13MB idle means it runs anywhere

The Bottom Line

LocalStack's community edition sunset left a gap. Floci fills it — and does it better. Faster, lighter, more services, truly free.

For indie hackers building serverless applications, this is the local development tool we've been waiting for. No auth tokens. No CI restrictions. No frozen security updates. Just docker compose up and you're testing against local AWS.

Check it out at github.com/hectorvent/floci.

Free tools like Floci are why I love the indie hacker community. Check out my products for more ways to build smarter — from AI automation guides to local development setups.

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