Watch Step Functions run — locally
A real-time workflow graph: states color in real time as the execution progresses, Choice branches show their conditions, and Task nodes deep-link to the local resources they invoke.
See your cloud, before you ship your cloud.
A local AWS cloud emulator: 54 AWS-compatible services — S3, Lambda, DynamoDB, RDS, Step Functions, API Gateway, Glue and more — on localhost:4566, with a 27-service web console on localhost:8080, real container-backed engines, and zero AWS account. Free.
$ curl -fsSL https://tanuj24.github.io/mimir/install.sh | shThen run mimir start and open http://localhost:8080 — click “Load sample data” on any console page to explore a populated cloud.
or run it with Docker — see all install options. Needs a container runtime (Docker Desktop, Docker Engine or colima); first download ~1 GB.
A real-time workflow graph: states color in real time as the execution progresses, Choice branches show their conditions, and Task nodes deep-link to the local resources they invoke.
All 27 services in the bundled web console, grouped the way AWS groups them. Click any service to see its page.
Storage · S3 console in Mimir
The bundled web console covers 27 services — every page has a one-click “Load sample data” button, so you can explore a populated cloud immediately.
Lambda runs in real runtime containers. RDS starts a real PostgreSQL, MySQL or MariaDB container — connect with psql or any client, exactly like the real thing. ElastiCache runs real Redis, Valkey or Memcached. OpenSearch is the real engine. EKS boots real k3s. EC2 gives you local instances with a browser SSH terminal.
Create a REST or HTTP API in the console, attach a Lambda integration, and curl it on localhost seconds later — no deploy pipeline, no waiting.
Real PySpark jobs and notebooks — including Apache Hudi — plus MSK/Kafka and ECS, all container-backed.
State persists automatically in a mimir-data Docker volume — surviving stops, container removal and image updates. No flags needed.
Data endpoints live in a dedicated 5500–5550 range — RDS, ElastiCache and Neptune via the published 5500–5524 ports; OpenSearch, EC2 SSH, EKS and ECR bind their host ports automatically. Your local Redis, Postgres and Elasticsearch stay untouched.
CloudFormation deploys real stacks, and every service streams logs to its AWS-convention CloudWatch log group, exactly like the real cloud.
Zero code changes: point your AWS CLI, SDK or app at http://localhost:4566 with access key mimir, secret mimir, region us-east-1 — everything runs locally on your machine.
| Mimir | LocalStack (free) | |
|---|---|---|
| Web console | ✓ 27 services, bundled | Resource browser |
| RDS / ElastiCache | ✓ Real Postgres/Redis, free | Paid tier |
| ECS / EKS | ✓ Real containers / k3s, free | Paid tier |
| Glue job execution | ✓ Real local Spark, free | Paid tier |
| Cognito / Athena | ✓ Included, free | Paid tier |
| Step Functions UI | ✓ Live workflow graph | — |
| Price | ✓ Everything free | Free core + paid tiers |
Install Mimir and point your AWS CLI or SDK at http://localhost:4566 with access key mimir, secret mimir, region us-east-1. No account and no sign-up. Core services work offline once pulled; container-backed engines (Glue, RDS, EKS) download their engine images on first use.
Yes — Mimir is free, including services LocalStack gates behind paid tiers: RDS, ECS, EKS, Cognito, Athena and Glue job execution, plus a full 27-service web console.
Yes. Functions run in real runtime containers with logs, versions, aliases, function URLs and event source mappings.
Yes. State persists automatically in a mimir-data Docker volume — no flags needed. It survives stops, container removal and image updates, and mimir update is lossless.
Yes — the image is multi-arch (arm64 + amd64), Apple Silicon native.
A container runtime — Docker Desktop, Docker Engine or colima. The first download is about 1 GB. See all install options.