gVisor vs Kuasar
gVisor
gvisor.devKuasar
kuasar.ioSide by side
| Figure | gVisor | Kuasar |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Linux | Yes | Yes |
| API | — | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 1 | 0 |
| Spec score · Container Runtime Software | 8.3 (#7) | 7.5 (#18) |
| Architecture | A sandbox includes a Sentry application kernel that handles system calls and a Gofer process that mediates filesystem access. | Kuasar consists of Kuasar-sandboxer for sandbox lifecycle and resource allocation management and Kuasar-Task for container lifecycle and resource allocation management. |
| Product | gVisor is an open-source Linux-compatible sandbox for running containers. | Kuasar is a low-level, multi-sandbox container runtime for managing container and sandbox lifecycles. |
Plans
In their own words
gVisor
gVisor is a free, open-source Linux-compatible sandbox and application kernel for running containers while isolating the host from untrusted code. It is intended for workloads such as user-uploaded, LLM-generated, and third-party code. Instead of passing sandboxed applications’ system calls directly to the host, its Sentry handles them; a Gofer process mediates filesystem access. The project describes a least-privilege design with a restrictive system call filter. It documents use with Docker, Kubernetes, containerd, and OCI runtimes, including Kubernetes configurations using GKE Sandbox, Minikube, or containerd with the gVisor shim. gVisor can stream application trace points to an external threat detection engine such as Falco, and can checkpoint and restore containers. Most CUDA applications can run unmodified in the sandbox with selected NVIDIA driver versions, but GPU support is restricted to certain models, drivers, capabilities, device files, ioctl calls, and platforms. Installation requires Linux 5.6 or later on x86_64 or ARM64. Compatibility is best-effort, and some applications may not work because not every system call, /proc file, or /sys file is implemented. Hardware side-channel protection is generally not provided.