AWSimFully Offline AWS Dev Environment

Single binary. 37 services. No auth tokens. No paywalls. No cloud dependency.

Fully Offline

Zero network calls. All state management, crypto, and parsing is local. No internet required.

S3, DynamoDB, SQS, Lambda, Cognito, IAM, and 31 more — all in a single binary under 30 MB.

Cold start in under 500ms with less than 10 MiB idle memory. No Docker required.

SvelteKit-based web UI for browsing and managing all emulated resources.

Actually runs your Node.js and Python Lambda functions as local processes.

Optional snapshot-based persistence. Your resources survive restarts.