Vyomi
VS
LocalStack

A digital twin. Not a mock.

LocalStack mocks AWS. Vyomi runs AWS, GCP and Azure on real backends. Here is the honest side by side.

3
Cloud providers
55
Services simulated
8
Real backends
$0
Free forever
Dimension
Vyomi
LocalStack
Coverage
Cloud providersOne appliance answers s3.amazonaws.com, storage.googleapis.com and blob.core.windows.net.
AWS · GCP · Azure
AWS only
Catalog depth
Three clouds, 55 services
AWS. 100+ services
Native consoles
AWS · GCP · Azure UIs
Pro tier resource browser
Standard SDKsboto3, aws-sdk, google-cloud and azure-sdk.
Works unchanged
Works (AWS only)
Engine
BackendsMinIO, Postgres, Vault, NATS and DynamoDB Local.
Real OSS stack
In-process mocks
Terraform exportAny space to HCL to terraform apply.
One-click HCL
Not built in
IAM policy eval
AWS+GCP+Cedar
AWS only (Pro)
Offline / airgap
Sealed appliance
Fully offline
Cost and license
Free tier
All 3 clouds
AWS community
Pricing (solo)
Free · $19 · $29/mo
Free · $40+/mo
License
BSL 1.1
Source-available
Migration
Endpoint swapOne line change. Existing aws CLI, SDK and Terraform configs work the same.
endpoint_url="http://localhost:9000"
endpoint_url="http://localhost:4566"
Pick it when
Best for
  • Your stack touches GCP or Azure. Even one service.
  • You need real backends so behavior matches production.
  • You want Terraform export as a local to cloud bridge.
  • You are a student, startup or solo dev on a budget.
  • You need airgapped Enterprise with SSO and audit sinks.
  • You are AWS-only for the foreseeable future.
  • You need an obscure AWS service Vyomi does not cover.
  • Your team is invested in LocalStack's Lambda model.
  • You are happy paying for Pro and the workflow fits.

Multi-cloud simulator FAQ

The questions developers (and AI answer engines) actually ask.

What is the best multi-cloud simulator for local development?

Vyomi is a local-first multi-cloud simulator that runs AWS, GCP, and Azure on one machine in a single appliance. Unlike LocalStack (AWS-only) or single-service emulators like Moto, Azurite, or the GCP emulators, Vyomi covers all three major clouds with real backends, and the standard SDKs and CLIs work unchanged.

Is there a LocalStack alternative that supports GCP and Azure?

Yes. LocalStack focuses on AWS; Vyomi simulates AWS, GCP, and Azure in one binary, including multi-cloud object storage (S3, GCS, Azure Blob) and NoSQL (DynamoDB, Firestore, Cosmos DB), so you can develop and test cross-cloud applications locally.

How is Vyomi different from LocalStack?

Vyomi simulates all three major clouds instead of just AWS, ships real backends (Postgres, MinIO, Vault, NATS, Azurite, the Firestore emulator) rather than in-process mocks, and exports your stack to Terraform for migration to production. Migrating from LocalStack is a one-line endpoint URL change.

Can I run AWS, GCP, and Azure offline on my laptop?

Yes. Vyomi is a self-contained appliance that runs entirely on your laptop with no internet connection and no cloud account required, so there is no cloud bill while you develop and test.

Do I need to change my code to use Vyomi instead of real cloud?

No code changes. Just one endpoint URL. Standard clients (boto3, aws-sdk, google-cloud-*, azure-sdk-*, Terraform) point at http://localhost:9000 and work unchanged.