The Lightweight, Drop-in Replacement for LocalStack.
Fast, Open Source, and Developer-First.
Website • Key Features • Supported Services • Community
MildStack is a high-performance, local-first AWS emulator designed to streamline your cloud development workflow. Unlike heavy alternatives that require Docker and significant system resources, MildStack is built in Go for maximum efficiency and speed.
Stop waiting for containers to spin up. Start building instantly with a local cloud that feels "mild" on your CPU but "spicy" on productivity.
- 🚀 Instant-On: No Docker required. MildStack runs as a native binary, starting in milliseconds.
- 🖥️ Desktop App: A beautiful, intuitive UI to browse S3 buckets, query DynamoDB tables, and monitor SQS queues without leaving your IDE.
- 🍃 Ultra-Lightweight: Minimal RAM and CPU footprint. Keep your machine cool while simulating complex cloud architectures.
- 🔌 Drop-in Compatibility: Works seamlessly with official AWS SDKs and CLI. Just change your endpoint URL.
- 📡 Offline-First: Build and test your cloud applications on a plane, a train, or anywhere without an internet connection.
- 💰 100% Free: No "Pro" tiers for basic features. Everything you need for local development, open-source and free.
MildStack is rapidly evolving. We currently provide robust support for core AWS services:
| Service | Status | Features |
|---|---|---|
| S3 | ✅ Active | Bucket management, Multipart uploads, Metadata support |
| DynamoDB | ✅ Active | Tables, GSI/LSI support, Rich querying & filtering |
| SQS | ✅ Active | Message queues, DLQ redrive, FIFO support |
| SNS | 📅 Planned | Topic publishing, basic subscriptions |
| Lambda | 📅 Planned | Local execution of serverless functions |
| EventBridge | 📅 Planned | Event-driven architecture simulation |
MildStack isn't just an emulator; it's a complete development environment:
Written in Go, our core provides a high-concurrency, low-latency API that mimics AWS service behavior with precision.
A modern, terminal-based control center (powered by Charm/BubbleTea) to manage your local instances, view logs, and monitor service health.
An Electron-powered visual console that gives you a "Production-like" experience for inspecting your local resources. Browse objects, edit items, and peek at messages with ease.
Our goal is to cover the 80% of AWS services used in 95% of applications. Check our Roadmap to see what's coming next, including Lambda support, IAM simulation, and more.
We love contributors! Whether you're fixing a bug, adding a new service, or improving the documentation, your help is welcome.
- Check out our Contribution Guidelines.
- Join our Discord community to discuss ideas.
- Spread the word! 🌟
MildStack is released under the MIT License. Build freely.
Built with ❤️ for developers.