Floci: Locally emulating any cloud service

148 points by theanonymousone 13 hours ago on hackernews | 29 comments

Any cloud.
Locally.

Run AWS, Azure, GCP, and OCI locally in milliseconds: the fast, credential-free loop your team and its AI agents need to ship faster.

Cloud Emulators

Pick your cloud. Start instantly.

Each emulator is a standalone MIT-licensed binary. No auth tokens, no feature gates, no cloud account needed.

floci

Drop-in replacement for LocalStack. Same port 4566, 119 services, native binary. Switch with zero code changes.

S3SQSLambdaDynamoDBRDSEKS+113 more

floci-az

Covers Blob, Queue, Table, Functions, App Config, Key Vault, Event Hubs and Service Bus. Native speed, MIT license, no Azure account needed.

BlobQueueTableFunctionsKey VaultEvent HubsService Bus+21 more

floci-gcp

Covers GCS, Pub/Sub, Firestore, Cloud Run, Cloud SQL, GKE and more. All 25 services on one port, native binary. MIT license, no GCP account needed.

GCSPub/SubFirestoreDatastoreSecret ManagerIAM+19 more

floci-oci

Covers Object Storage, Identity, Queue, Streaming, KMS, Vault and Functions. All 8 services on one port. MIT license, no Oracle Cloud account needed.

Object StorageQueueStreamingKMSVaultFunctions+2 more

Built for AI-assisted development

Give your AI agents a cloud they can't break.

Coding agents write cloud code faster than ever, but they can't safely run it against a real account. Point them at Floci instead: a local cloud to build, run, and verify against. Instant, free, and credential-free.

No credentials to leak.

Agents connect with throwaway keys. No real cloud secrets in the agent's context or sandbox. Nothing to exfiltrate, nothing to bill.

24ms

Inner-loop fast.

24 ms cold start, 13 MiB idle. Agents spin up, test, and tear down inside the edit loop instead of waiting on round-trips to a remote account.

real

Real signal, not mock theater.

Lambda, RDS, Redis, and Kafka run for real, so code an agent verifies locally behaves the same in production. No mock-shaped false positives.

✗

Zero blast radius.

Let agents iterate aggressively. Worst case, they reset a local container, not your staging environment or your cloud bill.

export AWS_ENDPOINT_URL=http://localhost:4566
pytest tests/

Works with every SDK, CLI, Terraform/OpenTofu module, and test runner your agents already use, with no special integration.

Developer Tools

One toolchain. All clouds.

Manage and explore every Floci emulator from a unified CLI or visual dashboard.

Why Floci

Built for developers who ship.

No gatekeeping. No pricing tiers. No surprises. A local cloud that starts in milliseconds and works everywhere.

MIT Licensed. Forever free.

Fork it, embed it, extend it. No "community edition" sunset, no enterprise feature flags. Every service is available to every developer, always.

✗

No auth token. Ever.

Pull the Docker image and go. No sign-ups, no API keys, no telemetry. LocalStack started requiring an auth token in March 2026. Floci never will.

24ms

Native binary speed.

Compiled with GraalVM Mandrel. Starts in 24ms, idles at 13 MiB, fast enough for inner-loop iteration. Your CI, your laptop, and your AI agents will all thank you.

real

Real engines, not mocks.

Lambda runs in real Docker containers. RDS uses real PostgreSQL/MySQL. ElastiCache runs real Redis. 100% protocol fidelity, no surprises in production.

Use Cases

Where teams put Floci to work.

From the inner loop to CI to the classroom — anywhere a real cloud account is too slow, too risky, or too expensive.

Ephemeral test environments.

Spin up the full stack inside every pipeline job. 24 ms startup adds nothing to the build, each job gets an isolated cloud, and teardown is free.

Local-first development.

Build against S3, Pub/Sub, or Service Bus on your laptop — offline if you want. No shared dev account to trip over, no credentials to rotate.

Infrastructure-as-code dry runs.

Apply Terraform, OpenTofu, or CloudFormation against localhost first. Catch typos, drift, and bad refactors before they ever touch a real account.

101

Workshops & onboarding.

Teach cloud services with zero billing risk. Every student runs the whole stack on their own machine — no accounts to provision, nothing to clean up.

Quick Start

One install. Every service, locally.

No account, no token. Pick your platform and go.

curl -fsSL https://floci.io/install.sh | sh

floci start && eval $(floci env)

aws s3 mb s3://my-bucket

echo "Why pay for S3 when floci is free? 🎉" > hello-floci.txt
aws s3 cp hello-floci.txt s3://my-bucket/

aws s3 cp s3://my-bucket/hello-floci.txt hello-back.txt
cat hello-back.txt

119 AWS services ready on :4566. S3 · SQS · DynamoDB · Lambda · RDS · +114 more