Open source alternatives to LocalStack

3 projects on starwire do the same job. Ranked by how much of what LocalStack does each one covers, read from its README and website. Ties go to the most active.

What LocalStack does

Emulate AWS services locallycore
Test without an AWS accountcore
S3, Lambda, DynamoDB and more
Docker based
CI testing
Infrastructure as code support

Each dot in the table is one job, in this order. Square dots are core jobs and count double. Full means yes, half means partly. "See the evidence" under a project shows the line behind each one. Coverage is what a project documents, not how well it works or how hard it is to move to. How we score this

Project	Covers	Stars	Commits, 12 weeks	Last release	Closed vs opened	Setup	License
flociLocal AWS emulator in Java, a free alternative to LocalStack	Replaces it100%	32k+682	3,835	14 days ago	99%	Needs a server	MIT
Covers everything on the checklist.See the evidence Emulate AWS services locallycoreYesfree, open-source local AWS emulator Test without an AWS accountcoreYesNo account. No auth token. No feature gates. S3, Lambda, DynamoDB and moreYesLambda, RDS, Neptune, ElastiCache, MSK, ECS, EC2 Docker basedYesJust docker compose up CI testingYesfor development, testing, and CI Infrastructure as code supportYesTerraform, CDK, OpenTofu
fakecloudLocal AWS emulator for testing services without an account	Replaces it100%	798+15	1,608	27 days ago	97%	Needs a server	AGPL-3.0
Covers everything on the checklist.See the evidence Emulate AWS services locallycoreYesfree, open-source local AWS emulator Test without an AWS accountcoreYesSingle binary, no account, no auth token, no paid tier. S3, Lambda, DynamoDB and moreYesS3, DynamoDB, SQS, SNS, EventBridge, Lambda Docker basedYesUse Docker (default) or native Kubernetes Pods CI testingYesWorks as a drop-in for LocalStack in CI Infrastructure as code supportYeswith Terraform (`endpoints` block), CDK (`cdklocal`)
aws-emulatorLocal emulator of the AWS APIs	Not checked yet	8.1k+1.9k	31,743	today	5%	Uses the terminal	CC0-1.0

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