Firejail alternatives
The 5 alternatives below are grouped by kind of sandbox, and each says what it does differently from Firejail. Start from whatever made you look: missing GPUs, session limits, self-hosting, pricing or isolation.
Why teams look beyond Firejail
The convenient choice for confining desktop applications on a Linux laptop; not designed as a server-side sandbox primitive.
- A SUID root binary, which widens the trusted computing base compared with unprivileged user-namespace tools
- Shares the host kernel; not a VM or user-space kernel boundary
- Desktop-oriented: no API, snapshots or orchestration for running sandboxes at scale
- Linux only
Firejail alternatives, by kind
Isolation primitives and runtimes
The hypervisors, user-space kernels, OS sandboxes and WebAssembly runtimes that sandbox platforms build on.
bubblewrap
The unprivileged Linux namespace sandboxer behind Flatpak and Anthropic's sandbox runtime; you assemble the policy from command-line flags.
- Linux namespaces
- Open source
- Self-hostable
How it differs: Lightweight process sandboxing on Linux where you control the policy and do not need a kernel boundary. The right primitive for a laptop or CI sandbox on Linux when you can write the policy yourself; not a substitute for a VM.
gVisor
Google's user-space application kernel for containers, with the runsc OCI runtime, GPU passthrough via nvproxy and checkpoint/restore; used by Modal, Beam, Anthropic, OpenAI and Google Cloud.
- User-space kernel
- Open source
- Self-hostable
- GPU
- Snapshots
How it differs: Sandboxing containers on hosts where you cannot or do not want to run a VM per workload, including GPU workloads. The most widely adopted non-VM sandbox boundary; choose it when a VM per workload is impractical or you need sandboxed GPUs.
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.
Local sandboxes for coding agents
Isolation for agents like Claude Code, Codex or Gemini CLI on your own laptop.
Anthropic Sandbox Runtime
Open-source CLI and library (`srt`) that restricts filesystem and network access for any local process at the OS level, without a container or VM.
- OS-level (Seatbelt / bubblewrap)
- Open source
- Self-hostable
How it differs: Lightweight local sandboxing of coding agents and CLI tools. Excellent lightweight guardrail for local agents; pair with a VM for untrusted multi-tenant code.
nono
Kernel-enforced OS-native sandbox for coding agents that runs each tool call in its own ephemeral sandbox, brokers credentials and keeps a tamper-evident audit chain.
- Landlock / Seatbelt
- Open source
- Snapshots
How it differs: Running Claude Code, Codex and other coding agents on your own machine with kernel-enforced file and network allow-lists and brokered credentials. A strong choice for per-tool-call policy and credential brokering around local coding agents, provided OS-level isolation is enough for your threat model.
Firejail vs alternatives
| Sandbox | Isolation | Open source | Self-host / BYOC | Cold start (vendor) | Max session | Snapshots / pause | GPU | SDKs |
|---|---|---|---|---|---|---|---|---|
| Firejail | Namespaces + seccomp | Yes | Yes / No | Not documented | Not documented | No / No | Not documented | CLI |
| Anthropic Sandbox Runtime | OS-level (Seatbelt / bubblewrap) | Yes | Yes / Not documented | Process start | Not documented | No / No | Not documented | CLI (srt), TypeScript (npm) |
| bubblewrap | Linux namespaces | Yes | Yes / No | Not documented | Not documented | No / No | Not documented | CLI |
| gVisor | User-space kernel | Yes | Yes / No | ms (claim) | Not documented | Yes / Not documented | Yes | CLI |
| nono | Landlock / Seatbelt | Yes | No / No | Not documented | Not documented | Yes / Not documented | Not documented | CLI, Rust, 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 Firejail?
Is there an open-source alternative to Firejail?
Cite this page
Agent Sandboxes. (2026). Firejail alternatives. agentsandboxes.org. Last reviewed November 9, 2026. https://agentsandboxes.org/alternatives/firejail/
Found an error or a missing sandbox? Submit a correction — every entry links to the sources it relies on.