# kuasar-io/kuasar

A multi-sandbox container runtime that provides cloud-native, all-scenario multiple sandbox container solutions.

Repository: https://github.com/kuasar-io/kuasar
Canonical: https://ross.abutalabs.com/products/kuasar
Homepage: https://kuasar.io
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: cloud-native, cncf, containerd, containers, docker, oci, sandbox, webassembly, microvm, wasmedge, cri, cloud-hypervisor, quark, rust
Last push: 2026-06-05T08:59:36+00:00

## Health v2 (maintenance only)
Score: 78/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 86, release rhythm 55, longevity 100
- inputs: {"age_days": 1493, "days_push": 89, "days_rel": 89, "gap_med": 220.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1443, forks 117 (observed 2026-08-28T04:04:44.853975+00:00)

## What it is
Kuasar is a multi-sandbox container runtime written in Rust that provides a unified sandbox abstraction on top of containerd's Sandbox API. It supports multiple isolation technologies including microVMs (Cloud Hypervisor, QEMU, StratoVirt), WebAssembly runtimes (WasmEdge, Wasmtime), app kernels (Quark), and runC, with an optimized framework that replaces shim processes for faster container startup.

## Use cases
- run containers with microvm isolation on kubernetes
- run wasm workloads alongside regular containers on one node
- reduce container startup time and shim overhead
- unified sandbox management for containerd
- choose between different container isolation levels per workload
- secure multi-tenant container execution

## When to choose
- you need multiple sandbox types (microVM, wasm, runc) managed through one runtime
- you use containerd and want sandbox as a first-class citizen
- container startup speed and shim overhead are critical
- you want a Rust-based, CNCF-ecosystem container runtime

## When to avoid
- you just need a standard container runtime without sandboxing (plain containerd/runc suffices)
- you require Firecracker support, which is still planned rather than shipped
- your stack is Docker-centric rather than containerd/Kubernetes-based

## Facets
- artifact type: infra-config
- maturity: active
- function: container-runtime, security, microservices, deployment
- domain: cloud-computing, security
- platform: rust, cloud
- tags: containerd, cri, sandbox, microvm, webassembly, wasm, cloud-hypervisor, qemu, wasmedge, runc, oci, cncf, containers, devops, linux, docker, kubernetes

## Member repositories
- kuasar-io/kuasar (main) score 78

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:44.853975+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 2026-08-30T04:36:21.349090+00:00, confidence not recorded.
  - readme: https://github.com/kuasar-io/kuasar (fetched 2026-08-28T04:04:44.853975+00:00, sha 3a6d55be3d4c)
  - homepage: https://kuasar.io (fetched 2026-08-29T11:46:28.190561+00:00, sha bfda91a64480)
  - site_page: https://kuasar.io/docs (fetched 2026-08-29T11:46:28.193049+00:00, sha 97e83fb44027)
- Data as of 2026-08-30T08:39:29.467469+00:00.