---
title: Namespace
slug: namespace
url: "https://toolweight.com/options/namespace"
homepage: "https://namespace.so"
categories: sandbox-providers
last_verified: 2026-07-23
license: CC-BY-4.0
---

# Namespace

> Fast microVM instances and CI runners with instant snapshots and cached builds.

Namespace sells fast ephemeral compute, originally as a drop-in replacement for GitHub Actions runners and increasingly as general microVM instances with snapshotting and aggressive build caching. The API is infrastructure-shaped rather than agent-shaped, so it competes with Fly Machines rather than E2B. Teams already using it for CI can reuse the same instances for agent workloads without adding a vendor.

## Identity

|  |  |
| --- | --- |
| Name | Namespace |
| Company | Namespace Labs |
| One-liner | Fast microVM instances and CI runners with instant snapshots and cached builds. |
| Site | https://namespace.so |
| Docs | https://namespace.so/docs |
| Founded | 2022 |
| Funding | Seed |
| Brand | https://toolweight.com/vendors/Namespace |
| Compared in | 1 |

## Where it is compared

### [Sandbox providers](https://toolweight.com/compare/sandbox-providers)
Ranked **#9 of 20** on default weights.
| Field | Value | Confidence | Verified | Source | Note |
| --- | --- | --- | --- | --- | --- |
| Cold start | 1.5 s | Inferred | - | - | Estimate for an instance created from a cached snapshot; CI runner starts are the workload this is tuned for. |
| Cold start (claimed) | 800 ms | Vendor-claimed | 2026-07-23 | https://namespace.so/compute/sandbox | Namespace publishes an actual boot timeline rather than a slogan: microVM allocated 0.1 s, kernel booted 0.2 s, network ready 0.3 s, custom image loaded 0.6 s, agent connected 0.8 s. The end of that timeline is the closest thing to this column's definition anyone here publishes, so 800 ms is recorded. Previously 1000 with no published figure behind it. |
| Isolation | microvm | Vendor-claimed | 2026-07-23 | https://namespace.so/compute/sandbox | "Every sandbox runs in its own microVM. This isn't container isolation, it's a virtual machine with a dedicated kernel." Promoted from inferred now that the vendor states it explicitly. |
| Root in guest | ● | Inferred | - | - | - |
| Egress control | proxy-logged | Inferred | - | - | Egress proxying exists mainly to serve build caching. |
| Max runtime | 1440 min | Inferred | - | - | - |
| Persistent FS | ● | Inferred | - | - | Volumes and cache volumes persist between runs. |
| Snapshot & fork | ● | Vendor-claimed | 2026-01-15 | https://namespace.so/docs | Instance snapshots are a headline feature. |
| Custom images | ● | Inferred | - | - | - |
| GPU | - | Unknown | - | - | - |
| Runtimes | any-oci-image | Inferred | - | - | - |
| Preview URLs | ◐ | Inferred | - | - | - |
| Browser inside | ◐ | Inferred | - | - | Browser images are common in CI use; nothing sandbox-specific is provided. |
| File up/download | ◐ | Inferred | - | - | - |
| Sydney region | ○ | Inferred | - | - | US and EU. |
| Concurrent limit | 100 sandboxes | Inferred | - | - | Plan-dependent. |
| MCP server | ○ | Inferred | - | - | - |
| SDKs | go, rest-api, cli | Inferred | - | - | - |
| Streaming output | ● | Inferred | - | - | - |
| Price / hour | - | Unknown | - | - | Priced per instance shape and per minute of runner time; not published as a directly comparable hourly rate. |
| Meter | per-minute | Inferred | - | - | - |
| Idle cost | free-when-stopped | Inferred | - | - | - |
| GitHub stars | - | Inferred | - | - | - |
| Funding | seed | Community-reported | - | - | - |
| Shipped | 2023 | Inferred | - | - | - |
| Positioning | Fast ephemeral compute for CI, builds and remote development. | Inferred | - | - | - |

**Verdict.** Sold to CI teams, useful to agent teams for the same reason: snapshotted microVMs with genuinely good caching. There is no agent SDK and no MCP server, so it competes with Fly rather than E2B, worth a look mainly if your builds already run here.

## Alternatives

- [ascii](https://toolweight.com/options/ascii), Agent orchestration over Telegram, running on box's VM infrastructure.
- [Blaxel](https://toolweight.com/options/blaxel), Agent-first cloud claiming ~25 ms microVM boots from snapshots.
- [box](https://toolweight.com/options/box), Persistent Linux VMs with SSH, per-VM IPv4 and disk-level forking, priced flat.
- [Cloudflare Sandbox](https://toolweight.com/options/cloudflare-sandbox), Container sandboxes driven from a Worker, addressed through Durable Objects.
- [CodeSandbox SDK](https://toolweight.com/options/codesandbox-sdk), Firecracker VMs with memory snapshots, from the online IDE, now owned by Together AI.
- [Daytona](https://toolweight.com/options/daytona), Sub-second container sandboxes for agent workloads, from a team that built a dev-env manager.
- [Self-hosted Firecracker](https://toolweight.com/options/diy-firecracker), The baseline: Firecracker on your own metal, plus every hard part you now own.
- [E2B](https://toolweight.com/options/e2b), Open-source Firecracker sandboxes with Python and TypeScript SDKs for AI agents.
- [exe.dev](https://toolweight.com/options/exe-dev), Persistent VMs you SSH into, with root, apt and systemd, on a flat monthly plan.
- [Fly.io Machines](https://toolweight.com/options/fly-machines), Raw Firecracker microVMs with a REST API, durable volumes and 35+ regions.
- [Freestyle](https://toolweight.com/options/freestyle), Run untrusted JavaScript and full dev servers, with git hosting and domains built in.
- [GitHub Codespaces](https://toolweight.com/options/github-codespaces), Devcontainer-backed cloud VMs built for humans, occasionally repurposed for agents.

## Licence and attribution

Data from toolweight (https://toolweight.com), licensed CC-BY-4.0.

- Licence: [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/)
- Canonical HTML: https://toolweight.com/options/namespace
- Machine-readable: https://toolweight.com/options/namespace.md · https://toolweight.com/api/v1 · https://toolweight.com/mcp
- toolweight takes no affiliate revenue and sells no placements. Corrections: https://toolweight.com/suggest