gVisor alternatives
The 5 alternatives below are grouped by kind of sandbox, and each says what it does differently from gVisor. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond gVisor
The most widely adopted non-VM sandbox boundary; choose it when a VM per workload is impractical or you need sandboxed GPUs.
- Syscall interception costs performance for syscall-heavy workloads; the KVM platform needs bare metal or nested virtualisation to perform well
- Only a limited set of NVIDIA ioctls and driver versions are supported, and gVisor "doesn't introduce any additional hardware-level isolation" for GPU driver bugs
- Not every Linux feature is implemented, so some applications need compatibility checks
- Linux x86_64 and arm64 hosts only
gVisor alternatives, by kind
Compute platforms with sandboxes
General serverless or app platforms that also offer sandboxes, often with GPUs.
Modal Sandboxes
Sandboxes on Modal’s serverless compute platform for running untrusted code at very high scale, with GPUs, snapshots and tunnels.
- gVisor or VM
- GPU
- Pause/resume
How it differs: High-concurrency and GPU-backed sandboxes — RL rollouts, evals and coding agents at scale. The best fit when scale or GPUs matter most, especially for teams already on Modal.
Open-source runtimes to self-host
Open-source sandbox runtimes you run on your own servers or Kubernetes.
Kubernetes Agent Sandbox
Open-source Kubernetes controller and CRDs for isolated, stateful sandbox pods for AI agents, with first-class support on GKE.
- gVisor or Kata
- Open source
- Self-hostable
- BYOC
- GPU
- Pause/resume
How it differs: Platform teams that want to run agent sandboxes on their own Kubernetes or GKE clusters. The leading open, Kubernetes-native way to self-host agent sandboxes, especially on GKE.
Isolation primitives and runtimes
The hypervisors, user-space kernels, OS sandboxes and WebAssembly runtimes that sandbox platforms build on.
Firecracker
The KVM-based microVM monitor from AWS that underpins Lambda and Fargate, and the sandboxes of E2B, Vercel, Fly.io, Koyeb and Northflank.
- KVM microVM
- Open source
- Self-hostable
- Pause/resume
How it differs: Building your own microVM sandbox fleet on Linux hosts with KVM. The reference microVM primitive for sandbox platforms; choose it when you are building a platform rather than consuming one.
Kata Containers
An OCI runtime that runs each Kubernetes pod in a lightweight VM with its own kernel, on QEMU, Cloud Hypervisor, Firecracker, Dragonball or StratoVirt.
- VM per pod
- Open source
- Self-hostable
- GPU
How it differs: Kubernetes clusters that need VM isolation per pod without leaving the container toolchain. The standard way to put a VM boundary around Kubernetes pods; choose it when your sandboxes are already pods.
nsjail
A Linux process isolation tool combining namespaces, cgroups, rlimits and Kafel seccomp-bpf policies, with listen, once and rerun modes for untrusted programs.
- Namespaces + seccomp
- Open source
- Self-hostable
How it differs: Running untrusted programs or network services under tight syscall, memory and CPU limits on Linux. A strong OS-level jail for execution APIs and CTF-style workloads; pair it with a VM when you need a kernel boundary.
gVisor vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| gVisor | User-space kernel | Yes | Yes / No | ms (claim) | Not documented | Yes / Not documented | Yes | CLI |
| Firecracker | KVM microVM | Yes | Yes / No | <125 ms (spec) | Not documented | Yes / Yes | No | REST API, CLI |
| Kata Containers | VM per pod | Yes | Yes / No | Not documented | Not documented | Not documented / Not documented | Yes | CLI |
| Kubernetes Agent Sandbox | gVisor or Kata | Yes | Yes / Yes | <1 s (warm pool) | Not documented | Yes / Yes | Yes | Kubernetes CRDs, Python, kubectl |
| Modal Sandboxes | gVisor or VM | No | No / Not documented | <1 s | Up to 24 h | Yes / Yes | Yes | Python, JavaScript/TypeScript, Go |
| nsjail | Namespaces + seccomp | Yes | Yes / No | Not documented | Configurable | No / No | Not documented | CLI |
Frequently asked questions
What are the main alternatives to gVisor?
Is there an open-source alternative to gVisor?
Cite this page
Agent Sandboxes. (2026). gVisor alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/gvisor/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.