# sivchari/kumo

A lightweight AWS service emulator written in Go

Repository: https://github.com/sivchari/kumo
Canonical: https://ross.abutalabs.com/products/sivchari-kumo
Language: Go
License: MIT
License Family: permissive
Topics: aws, cicd, cloud, continuous-integration, developer-tools, go, testing, localstack
Last push: 2026-08-19T05:32:17+00:00

## Health v2 (maintenance only)
Score: 81/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 96, longevity 15
- inputs: {"age_days": 211, "days_push": 14, "days_rel": 26, "gap_med": 1.0, "n_releases_24m": 51}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1448, forks 90 (observed 2026-08-28T04:04:45.493511+00:00)

## What it is
Kumo is a lightweight AWS service emulator written in Go that mimics 82 AWS services such as S3, DynamoDB, SQS, and Lambda. It runs as a single binary or Docker container, requires no authentication, and supports optional data persistence for local development and CI/CD testing.

## Use cases
- emulate AWS services locally without an AWS account
- run integration tests against fake AWS services in CI pipelines
- test Go code using AWS SDK v2 without hitting real AWS
- spin up a local S3 or DynamoDB server for development
- replace Localstack with a lighter single-binary alternative
- persist emulated AWS data across restarts during development

## When to choose
- you need fast, lightweight AWS emulation in CI with no auth setup
- you want a single binary or Docker container instead of Localstack's heavier stack
- your tests use AWS SDK v2 from Go
- you need broad service coverage (82 services) in an emulator

## When to avoid
- you need exact AWS API fidelity or advanced service behaviors
- you rely on AWS services not among the 82 supported ones
- you need multi-account, IAM enforcement, or realistic security semantics

## Facets
- artifact type: cli-tool
- maturity: active
- function: testing, mock-api, http-server, developer-tools
- domain: cloud-computing, testing, developer-tools
- platform: go, cli, cross-platform
- tags: aws-emulator, localstack-alternative, ci-testing, single-binary, aws-sdk, devops, docker

## Member repositories
- sivchari/kumo (main) score 81

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:45.493511+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:36:04.696570+00:00, confidence not recorded.
  - readme: https://github.com/sivchari/kumo (fetched 2026-08-28T04:04:45.493511+00:00, sha 3b7b00ee2020)
- Data as of 2026-08-30T08:39:29.467469+00:00.