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microsandbox

microsandbox.dev

From $49/mo Free plan WindowsmacOSLinuxAPISelf-hosted
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Spec score 8.2 #8 of 26 in Sandbox Software

What it is

Microsandbox runs untrusted workloads inside microVMs, each with its own Linux kernel, filesystem, and network boundary rather than sharing the host kernel. It can run AI agents, user code, plugins, CI jobs, scrapers, and automation. The local runtime starts on a user's machine without a daemon, root service, or account; it can also run on personal servers or clusters, and its cloud platform can be deployed in the user's infrastructure. Microsandbox offers SDKs for TypeScript, Rust, Python, Go, and Ruby, plus a CLI and MCP workflows, and accepts OCI images from container registries. By default, sandboxes can reach the public internet, while private, host-local, link-local, and metadata destinations are blocked; egress can be allowlisted or disabled. The runtime is open source under Apache 2.0. The Free plan is $0 per month, while paid plans start at $49 per month. Microsandbox Cloud is in private beta and requires an access request.

Spec sheet

What it does
Microsandbox is a local-first microVM runtime for running untrusted workloads, including AI agents, user code, plugins, CI jobs, scrapers, and automation.Read 30 Sep 2026 · docs.microsandbox.dev
Support
The product FAQ directs users with questions to its Discord community.Read 30 Sep 2026 · microsandbox.dev
License
The runtime is open source under the Apache 2.0 license.Read 30 Sep 2026 · microsandbox.dev
Company
Microsandbox is designed and engineered by Super Rad Company, whose stated purpose is building tools for the agentic future.Read 30 Sep 2026 · superrad.company
Cloud availability
Microsandbox Cloud is in private beta and requires users to request access.Read 30 Sep 2026 · docs.microsandbox.dev
Credential handling
Bound secrets are represented by placeholders inside the sandbox and substituted host-side for supported intercepted requests to approved destinations.Read 30 Sep 2026 · microsandbox.dev
Credential limitation
Secret substitution requires intercepted TLS by default, and body substitution is opt-in with format and size limits.Read 30 Sep 2026 · microsandbox.dev
Images
The runtime accepts OCI images from Docker Hub, GHCR, ECR, GCR, or another registry.Read 30 Sep 2026 · docs.microsandbox.dev
Integrations and languages
The product supports SDKs for TypeScript, Rust, Python, Go, and Ruby, plus a CLI and MCP workflows.Read 30 Sep 2026 · microsandbox.dev
Isolation
Each sandbox is a microVM with its own Linux kernel, filesystem, and network boundary, rather than a container sharing the host kernel.Read 30 Sep 2026 · docs.microsandbox.dev
Local runtime
The local runtime starts on the user's machine without a daemon, root service, or account.Read 30 Sep 2026 · microsandbox.dev
Network controls
By default, sandboxes can reach the public internet while private, host-local, link-local, and metadata destinations are blocked; egress can be allowlisted or disabled.Read 30 Sep 2026 · microsandbox.dev
Self-hosting
The runtime can be run on the user's own servers or clusters, and the cloud platform can be deployed in the user's infrastructure.Read 30 Sep 2026 · docs.microsandbox.dev
Snapshots
Local full snapshots can preserve disk, memory, and running processes; managed cloud currently supports disk snapshots from stopped persistent sandboxes and disk restore.Read 30 Sep 2026 · microsandbox.dev

Plans and prices

Free Free $0 per month 5 vCPU-hours · 20 memory GiB-hours · 20 disk GiB-hours · up to 3 sandboxes · each capped at 1 vCPU, 512 MiB memory, 8 GiB writable disk · 1 GiB durable storage · no overage rates Read 30 Sep 2026 · microsandbox.dev
Builder $49 a month $49 per month 500 vCPU-hours · 2,000 memory GiB-hours · 2,000 disk GiB-hours · 50 GiB durable storage · 1,000 ephemeral-running · 50 persistent-running Read 30 Sep 2026 · microsandbox.dev
Teams $299 a month $299 per month 2,000 vCPU-hours · 8,000 memory GiB-hours · 8,000 disk GiB-hours · 250 GiB durable storage · 25,000 ephemeral-running · 500 persistent-running Read 30 Sep 2026 · microsandbox.dev
Enterprise Priced on request custom agreement 4,000 vCPU-hours · 16,000 memory GiB-hours · 16,000 disk GiB-hours · 500 GiB durable storage · ephemeral and persistent running limits set together · committed or BYOC model Read 30 Sep 2026 · microsandbox.dev

Every microsandbox plan and price →

Strong points and limits

Strong points

  • Each sandbox has its own kernel and network boundary.
  • Local runtime needs no daemon, root service, or account.
  • SDKs cover five listed programming languages.
  • Supports OCI images and configurable egress controls.
  • Free plan; runtime is Apache 2.0 open source.

Limits

  • Cloud access requires a request during private beta.
  • Secret substitution requires intercepted TLS by default.
  • Free plan caps workloads at three sandboxes.
  • Builder costs $49 per month.

Who it suits

It suits developers and teams that need to run untrusted workloads locally or on their own infrastructure. Cloud users must request access while the service is in private beta.

Verdict

Microsandbox specifies its isolation model, runtime options, integrations, and network defaults in detail. Check the plan limits and credential-substitution requirements against your workload before choosing a paid tier.

Where Specifiction places it

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