James Routley

🍿☁️ Light, fluffy, and always free

Named after floccus — the cloud formation that looks exactly like popcorn.

A free, open-source local AWS emulator. No account. No feature gates. No CI restrictions. Just docker compose up.

LocalStack's community edition sunset in March 2026 — requiring auth tokens, dropping CI support, and freezing security updates. Floci is the no-strings-attached alternative.

	Floci	LocalStack Community
Auth token required	No	Yes (since March 2026)
CI/CD support	Unlimited	Requires paid plan
Security updates	Yes	Frozen
Startup time	~24 ms	~3.3 s
Idle memory	~13 MiB	~143 MiB
Docker image size	~90 MB	~1.0 GB
License	MIT	Restricted
API Gateway v2 / HTTP API	✅	❌
Cognito	✅	❌
ElastiCache (Redis + IAM auth)	✅	❌
RDS (PostgreSQL + MySQL + IAM auth)	✅	❌
S3 Object Lock (COMPLIANCE / GOVERNANCE)	✅	⚠️ Partial
DynamoDB Streams	✅	⚠️ Partial
IAM (users, roles, policies, groups)	✅	⚠️ Partial
STS (all 7 operations)	✅	⚠️ Partial
Kinesis (streams, shards, fan-out)	✅	⚠️ Partial
KMS (sign, verify, re-encrypt)	✅	⚠️ Partial
Native binary	✅ ~40 MB	❌

20+ services. 408/408 SDK tests passing. Free forever.

# docker-compose.yml
services:
  floci:
    image: hectorvent/floci:latest
    ports:
      - "4566:4566"
    volumes:
      - ./data:/app/data

All services are available at http://localhost:4566. Use any AWS region — credentials can be anything.

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

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

Point your existing AWS SDK at http://localhost:4566 — no other changes needed.

// Java (AWS SDK v2)
DynamoDbClient client = DynamoDbClient.builder()
    .endpointOverride(URI.create("http://localhost:4566"))
    .region(Region.US_EAST_1)
    .credentialsProvider(StaticCredentialsProvider.create(
        AwsBasicCredentials.create("test", "test")))
    .build();

# Python (boto3)
import boto3
client = boto3.client("s3",
    endpoint_url="http://localhost:4566",
    region_name="us-east-1",
    aws_access_key_id="test",
    aws_secret_access_key="test")

// Node.js (AWS SDK v3)
import { S3Client } from "@aws-sdk/client-s3";

const client = new S3Client({
    endpoint: "http://localhost:4566",
    region: "us-east-1",
    credentials: { accessKeyId: "test", secretAccessKey: "test" },
    forcePathStyle: true,
});

Tag	Description
`latest`	Native image — sub-second startup (recommended)
`latest-jvm`	JVM image — broadest platform compatibility
`x.y.z` / `x.y.z-jvm`	Pinned releases

All settings are overridable via environment variables (FLOCI_ prefix).

Variable	Default	Description
`QUARKUS_HTTP_PORT`	`4566`	HTTP port
`FLOCI_DEFAULT_REGION`	`us-east-1`	Default AWS region
`FLOCI_DEFAULT_ACCOUNT_ID`	`000000000000`	Default AWS account ID
`FLOCI_STORAGE_MODE`	`hybrid`	`memory` · `persistent` · `hybrid` · `wal`
`FLOCI_STORAGE_PERSISTENT_PATH`	`./data`	Data directory

→ Full reference: configuration docs → Per-service storage overrides: storage docs

MIT — use it however you want.

Floci – A free, open-source local AWS emulator

🍿☁️ Light, fluffy, and always free