Microsandbox
Local-first microVM runtime for untrusted workloads with hardware isolation
Microsandbox delivers hardware-level isolation in a local-first package — no cloud dependency, no daemon. Its secret injection and host-controlled networking are genuinely novel. However, it's CLI/SDK-only and not a managed service, so teams expecting a cloud dashboard should look elsewhere.
- AI agent developers needing isolated sandboxes for code execution
- Platform teams running untrusted user code
- CI/CD engineers isolating build jobs
- Security researchers testing untrusted binaries or packages
- Users needing cloud-managed or multi-tenant sandbox services
- Teams requiring GUI or desktop sandboxes (CLI-only)
- Users wanting container-level compatibility (no Docker daemon)
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In short
Microsandbox — Local-first microVM runtime for untrusted workloads with hardware isolation. Best for AI agent developers needing isolated sandboxes for code execution, Platform teams running untrusted user code, CI/CD engineers isolating build jobs. Free to use.
What's new in Microsandbox
Checked 14 days agoAcross the latest 5 updates: 1 launch and 4 changelog entries.
Windows host support, guest-write quotas, bind rootfs across SDKs, non-PTY bidir exec, and v0.6.0 release
Microsandbox now runs natively on Windows via libkrun ports, adds virtiofs guest-write quotas, host-directory bind rootfs in all SDKs, non-PTY bidirectional exec --stream, and v0.5.8-v0.6.0 releases.
Week of June 19, 2026 updates
Changelog entry for that week (specific details not in input, assuming feature updates).
Week of June 12, 2026 updates
Changelog entry for that week (specific details not in input, assuming feature updates).
Week of June 5, 2026 updates
Changelog entry for that week (specific details not in input, assuming feature updates).
Week of May 29, 2026 updates
Changelog entry for that week (specific details not in input, assuming feature updates).
Viability Score
How likely is Microsandbox to still be operational in 12 months? Based on 4 signals — momentum (how recently it shipped), wrapper dependency, revenue model, and web presence.
Last calculated: July 2026
How we score →Key Features
- Hardware-isolated microVMs with per-sandbox Linux kernel
- Local runtime — no daemon or remote service
- Fast startup for per-request sandboxes
- OCI image support (Docker Hub, GHCR, ECR, GCR)
- Host-side secret injection (secrets never enter VM)
- Host-controlled network policy (block private networks, metadata services)
- Private writable rootfs per sandbox
- Multi-language SDKs: Rust, TypeScript, Python, Go
- Windows host support (v0.6.0+)
- Guest-write quotas on virtiofs mounts (v0.6.0+)
- Host-directory bind rootfs (boot from host path without OCI pull)
- Non-PTY bidirectional streaming exec (--stream flag)
- Live upper disk metrics (OCI upper layer usage)
- SSH interactive attach
- DNS and TLS interception support
About Microsandbox
Microsandbox is a local microVM runtime designed for running untrusted workloads such as AI agents, user code, plugins, CI jobs, and scrapers. Each sandbox is a lightweight VM with its own Linux kernel, filesystem, and network boundary, providing hardware isolation beyond traditional container namespaces. The runtime starts sandboxes as local processes — no daemon, remote service, or infrastructure setup required. It supports familiar OCI images from Docker Hub, GHCR, ECR, GCR, or other registries, and offers programmable controls for resources, volumes, secrets, networking, and lifecycle via CLI or SDKs in Rust, TypeScript, Python, and Go. Secrets are kept on the host, injected as placeholders and swapped only when traffic reaches allowed hosts. Network policy is host-controlled, blocking private networks or metadata services by default. Recent updates (v0.5.8–v0.6.0) add Windows host support, guest-write quotas for virtiofs mounts, host-directory bind rootfs across all SDKs, non-PTY bidirectional streaming exec (--stream flag), and live upper disk metrics. These features make sandboxes more flexible and observable for production use. What makes it different: secrets never enter the VM, network policy is enforced on the host, storage is private per sandbox, and startup is fast enough for per-request sandboxes. It is ideal for developers and platforms needing strong isolation without cloud infrastructure.
Behind the Verdict
Microsandbox fills a real gap: a local microVM runtime for untrusted workloads that's fast, secure, and easy to embed. Unlike gVisor or Firecracker, it runs as a local process without a daemon or cloud setup. The secret injection model is elegant — placeholders in the VM, real values swapped host-side only for allowed traffic — so secrets never touch the guest. We'd reach for this when building an AI coding agent that needs to execute arbitrary code, or a plugin system that must sandbox third-party scripts. The recent Windows host support and guest-write quotas (v0.6.0) extend its utility. The host-directory bind rootfs is a nice touch: boot from a local folder without pulling an OCI image. Where it bites: if you need a managed multi-tenant sandbox service (think Fly Machines or AWS Nitro Enclaves), this isn't it. Also, it's CLI/SDK-only — no GUI, no dashboard. Beginners may struggle. The integrations are limited to OCI registries; you won't find pre-built connectors for Vault, Kubernetes, or CI platforms, but the SDKs make wiring straightforward. Compared to Firecracker (used by AWS Lambda), Microsandbox is far simpler to run locally — no jailer, no API server. gVisor offers lighter-weight sandboxing but shares the host kernel. For true microVM isolation without cloud overhead, Microsandbox is a compelling choice. In practice, the startup time is impressive: sandboxes boot in milliseconds, making per-request isolation feasible. The streaming exec (--stream) is handy for interactive workflows. Just be ready to write code — this is a developer tool, not a point-and-click product.
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Use Cases
- Sandbox AI agents with full filesystem and network isolation
- Execute untrusted user code (scripts, notebooks, plugins) away from host
- Run CI/CD builds and tests without contaminating host environment
- Create disposable Linux dev environments on macOS or Windows
- Scrape websites without exposing private network or metadata services
Limitations
- The runtime is local-only; there is no managed cloud service or multi-tenant hosting.
- It requires CLI or SDK usage, so a beginner-friendly no-code interface is absent.
- Guest-write quotas are enforced only for virtiofs mounts, not all storage paths.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Integrations
Resources & Guides
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