---
title: Freestyle
slug: freestyle
url: "https://toolweight.com/options/freestyle"
homepage: "https://freestyle.sh"
categories: sandbox-providers
last_verified: 2026-01-15
license: CC-BY-4.0
---

# Freestyle

> Run untrusted JavaScript and full dev servers, with git hosting and domains built in.

Freestyle targets the specific shape of app-builder products: execute untrusted JavaScript, run a dev server the user can see, host the git repository, and attach a domain. That vertical integration is the point, the sandbox, the repo and the preview URL are one product rather than three vendors. The tradeoff is a JavaScript-centric runtime story and a much smaller surface than general-purpose providers.

## Identity

|  |  |
| --- | --- |
| Name | Freestyle |
| Company | Freestyle |
| One-liner | Run untrusted JavaScript and full dev servers, with git hosting and domains built in. |
| Site | https://freestyle.sh |
| Docs | https://docs.freestyle.sh |
| Founded | 2024 |
| Funding | Seed |
| Brand | https://toolweight.com/vendors/Freestyle |
| Compared in | 1 |

## Where it is compared

### [Sandbox providers](https://toolweight.com/compare/sandbox-providers)
Ranked **#11 of 20** on default weights.
| Field | Value | Confidence | Verified | Source | Note |
| --- | --- | --- | --- | --- | --- |
| Cold start | 700 ms | Inferred | - | - | Estimate for the code-execution API; dev servers with a repo checkout take considerably longer. |
| Cold start (claimed) | - | Unknown | - | - | No consistently published figure. |
| Isolation | microvm | Inferred | - | - | - |
| Root in guest | ◐ | Inferred | - | - | Dev servers give you a shell; the execute API does not. |
| Egress control | allowlist | Inferred | - | - | Network access for executed code is opt-in per call. |
| Max runtime | 60 min | Inferred | - | - | Execution calls are short; dev servers persist while in use. |
| Persistent FS | ● | Inferred | - | - | Repos are hosted as git, which is the persistence layer. |
| Snapshot & fork | ◐ | Inferred | - | - | Git branching substitutes for VM forking. |
| Custom images | ○ | Inferred | - | - | Managed runtime rather than arbitrary images. |
| GPU | ○ | Inferred | - | - | - |
| Runtimes | javascript-typescript, python | Inferred | - | - | - |
| Preview URLs | ● | Vendor-claimed | 2026-01-15 | https://docs.freestyle.sh | Dev server previews and custom domains are core to the product. |
| Browser inside | ○ | Inferred | - | - | - |
| File up/download | ● | Inferred | - | - | Filesystem and git APIs. |
| Sydney region | ○ | Inferred | - | - | - |
| Concurrent limit | - | Unknown | - | - | - |
| MCP server | ◐ | Inferred | - | - | - |
| SDKs | typescript, rest-api | Inferred | - | - | - |
| Streaming output | ● | Inferred | - | - | - |
| Price / hour | - | Unknown | - | - | Priced per dev-server hour and per execution; no comparable vCPU/RAM rate is published. |
| Meter | per-request | Inferred | - | - | Executions are per-call; dev servers are metered by uptime. |
| Idle cost | storage-only | Inferred | - | - | - |
| GitHub stars | - | Inferred | - | - | - |
| Funding | seed | Community-reported | - | - | - |
| Shipped | 2024 | Inferred | - | - | - |
| Positioning | The backend for AI app builders: run code, host git, serve previews, attach domains. | Inferred | - | - | - |

**Verdict.** Not a general sandbox and not pretending to be. If you are building a Lovable-shaped product, Freestyle collapses four vendors into one and the preview-and-domain plumbing alone justifies it. For anything outside JavaScript app-building it is the wrong shape.

## 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.
- [GitHub Codespaces](https://toolweight.com/options/github-codespaces), Devcontainer-backed cloud VMs built for humans, occasionally repurposed for agents.
- [Islo](https://toolweight.com/options/islo), Per-agent isolated cloud sandboxes with enterprise policy controls, from Incredibuild.

## 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/freestyle
- Machine-readable: https://toolweight.com/options/freestyle.md · https://toolweight.com/api/v1 · https://toolweight.com/mcp
- toolweight takes no affiliate revenue and sells no placements. Corrections: https://toolweight.com/suggest