Amazon Web Services
AWS API
S3, EC2, IAM, SQS, RDS, DynamoDB, Lambda, API Gateway, VPC — every endpoint Vyomi simulates, documented inline.
⌨ CLI · boto3 · Java · Go · TerraformKnowledge Center
Interactive Swagger consoles, SDK + CLI usage, coverage tables, and the architecture story behind the vyomi simulator.
API REFERENCE
Google Cloud
GCP API
Compute, Storage, Cloud SQL, Pub/Sub, Firestore, Functions, API Gateway, VPC, IAM — every endpoint Vyomi simulates.
⌨ gcloud · gsutil · Java · Go · Terraform
Microsoft Azure
Azure API
Virtual Machines, Blob Storage, SQL, Service Bus, Cosmos DB, Functions, APIM, VNet, Entra / RBAC.
⌨ az CLI · Java · Go
REFERENCE & TRANSPARENCY
Coverage
Service matrix
35 services across 3 clouds with real-backend / simulated tags and an SDK compatibility table.
Architecture
Real backends, not mocks
Postgres · MinIO · Vault · NATS · DynamoDB-Local · Cedar — what powers each cloud surface.
Conformance
SDK pass rates
88% latest. Java · Go · Python tests against unmodified SDKs. Honest gaps documented.
NATIVE-SDK DEEP-DIVES
Azure · Messaging
Azure messaging, natively
Service Bus speaks AMQP — unserveable locally. How the unmodified azure-storage-queue SDK gives you real queue round-trips over HTTP on Azurite, and what that trades away.
GCP · KMS & Secrets
GCP KMS & Secrets, natively
Google's SDKs default to gRPC with no emulator. How their own newHttpJsonBuilder() REST transport keeps the unmodified client working against the appliance over HTTPS.
COMPARISONS
Comparison
Emulator landscape
All the local cloud options side by side — LocalStack, Moto, Azurite, GCP emulators and Vyomi.
Comparison
vs LocalStack
Multi-cloud digital twin vs AWS-only mocks — three clouds, real backends, Terraform export.
Comparison
vs Moto
A full running environment vs in-process AWS mocks for Python unit tests.
Comparison
vs Azurite
The whole cloud vs the Azure Storage emulator — which Vyomi embeds for Blob.
Comparison
vs GCP emulators
One endpoint for all of GCP (plus AWS and Azure) vs a separate emulator per service.
Comparison
vs Firebase Suite
Multi-cloud infrastructure vs the Firebase app platform — an honest, overlapping fit.
HOW-TO GUIDES
How-to
Run AWS locally
Point boto3, the aws CLI and Terraform at a local endpoint — no account, no bill.
How-to
Run Google Cloud locally
google-cloud-storage, Firestore and Terraform against one local endpoint.
How-to
Run Azure locally
azure-storage-blob, Cosmos DB and Terraform locally — Azurite-backed Blob included.
How-to
Test cloud apps offline
Run your cloud test suite with no network and no secrets — locally and in CI.
FROM THE BLOG
Blog · localstack
If your stack outgrew AWS-only, moving from LocalStack to Vyomi is mostly a one-line endpoint change. Here's what carries over, what's different, and how to do it.
Blog · iam
An emulator that rubber-stamps every call can't catch the policy that denies you in production. Here's how to evaluate real authorization locally.
Blog · s3
Most ways to get a local S3 hand you a mock that re-implements the API. Here's how to develop against real S3 semantics locally — ETags, pagination, presigned URLs and all.
Blog · dynamodb
Local NoSQL testing usually means a different tool per cloud. Here's how to run DynamoDB, Firestore and Cosmos DB locally and hit each with its real SDK — no cloud account, no per-cloud emulator zoo.
Blog · terraform
A local environment is only half the story if you can't ship it. Here's how Vyomi turns the stack you built locally into Terraform HCL you can apply to real cloud.
Blog · testing
Mocks re-implement a cloud API's shape; a digital twin runs the real backends behind it. The gap between them is exactly where 'passed locally, failed in prod' lives.
Blog · multi-cloud
The whole trick to local multi-cloud development is smaller than people expect: change the endpoint, keep the SDK. Here's the pattern across all three clouds.