Developer Tools·Standings

Compare Cloud Service Emulators

Cloud service emulators imitate cloud services for development and other work. Compare the signal score out of 10, the platforms you need, and the API, open-source, and free-plan marks.

The board covers tools such as AWS SAM CLI, Azurite, and LocalStack. Its platform labels include Linux, macOS, Windows, self-hosted, API, and web.

  • 15 platforms
  • 1 with a public API on this page
  • 12 with a free tier
  • Checked 28 Oct 2026
  1. 1
    L
    LocalStacklocalstack.cloud

    An open-source cloud emulator that runs on your infrastructure; free and paid plans are available.

    7.7 APIOpenFree Free tier
  2. 2
    E
    ElasticMQSoftwareMill

    ElasticMQ is an in-memory message queue system with an Amazon SQS-compatible interface.

    6.3 APIOpenFree Free tier
  3. 3
    A
    Azuritegithub.com

    A free, open-source Azure Storage emulator for local use, with Blob and Queue support and Table in preview.

    6.2 APIOpenFree Free tier
  4. 4
    CB
    Cloud Bigtable emulatorGoogle Cloud

    A free local Bigtable emulator that works with its client libraries; data disappears when it stops.

    6.2 APIOpenFree Free tier
  5. 5
    AS
    AWS SAM CLIAmazon Web Services

    A free, cross-platform command-line tool for building and testing serverless apps locally before deployment.

    6.1 APIOpenFree Free tier
  6. 6
    DL
    DynamoDB Localdocs.aws.amazon.com

    DynamoDB Local lets developers develop and test applications without accessing the DynamoDB web service.

    6.1 APIOpenFree Free tier
  7. 7
    FL
    Firebase Local Emulator SuiteGoogle

    A free local suite of Firebase service emulators for building and testing apps.

    6.1 APIOpenFree Free tier
  8. 8
    AC
    Azure Cosmos DB Emulatorlearn.microsoft.com

    A free local Cosmos DB emulator for offline development; the Linux version runs in a Docker container.

    6.0 APIOpenFree Free tier
  9. 9
    FS
    Fake S3Fake S3 Project

    A free local server that mimics S3 calls for offline development and testing, including put, get, and list.

    6.0 APIOpenFree Free tier · from $2,500/yr
  10. 10
    CS
    Cloud Spanner emulatorGoogle Cloud

    The emulator is for local application development and testing, not production deployments.

    6.0 APIOpenFree Free tier
  11. 11
    S
    S3rverS3rver Project

    A free, local server that imitates Amazon S3 for apps that store and retrieve files.

    4.6 APIOpenFree Free tier
  12. 12
    SO
    Serverless OfflineServerless Framework

    A free Serverless Framework plugin that runs apps locally with an API Gateway-like endpoint.

    4.6 APIOpenFree Free tier
  13. 13
    K
    KinesaliteKinesalite Project

    A local emulator for Amazon Kinesis that lets apps use its data-stream service on your computer.

    3.8 APIOpenFree —
  14. 14
    MS
    Moto ServerMoto Project

    A local server that imitates Amazon Web Services for testing apps without connecting to AWS.

    3.8 APIOpenFree —
  15. 15
    SA
    ScyllaDB AlternatorScyllaDB

    A ScyllaDB feature that supports the Amazon DynamoDB API for apps using that service.

    3.8 APIOpenFree —

Places #1, #2, #3, #4, #5 on this board are open to sponsors. Take #1 · Other ways to advertise

How to choose

Which platforms does it need to run on?

Choose a tool whose platform marks match your setup. The board includes Linux, macOS, Windows, self-hosted, API, and web labels.

If you need to run software on your own systems, check for the self-hosted mark. AWS SAM CLI lists Linux, macOS, and Windows; Cloud Spanner emulator also lists an API.

Can I use a cloud service emulator for free?

Check the free-plan and free-trial marks on the tool before choosing. AWS SAM CLI, Azurite, and DynamoDB Local are marked as having free plans.

A free trial and a free plan are separate marks, so check which one applies to the tool you are considering.

Does it have a public API?

Check the API mark if you need a public API. Cloud Spanner emulator is listed with an API platform label.

Can I inspect or change the code?

Check the open-source mark and the tool's licence before relying on code access or modification. Azurite and ElasticMQ have GitHub pages, but a GitHub page alone does not establish an open-source licence.

Questions

What does a cloud service emulator do?

It imitates a cloud service for development or other work. Compare the platform labels and the API, open-source, and free-plan marks.

Which cloud service emulators have a free plan?

AWS SAM CLI, Azure Cosmos DB Emulator, Azurite, Cloud Bigtable emulator, Cloud Spanner emulator, and DynamoDB Local are marked as having free plans.

How do I check whether an emulator works on Windows or macOS?

Check its platform labels. AWS SAM CLI lists both Windows and macOS; Cloud Bigtable emulator also lists both.

What does the signal score out of 10 mean?

It reflects published information about usage, a public API, documentation depth, open-source code, and a free tier to try.

How can I tell if a cloud service emulator is open source?

Check its open-source mark and licence. A GitHub page by itself does not confirm the licence.

Some top positions on this board can be paid placements, standing where they were sold. The facts on each platform are not for sale. How we rank · Disclosure