Freestyle
Run untrusted JavaScript and full dev servers, with git hosting and domains built in.
Overall in sandbox providers
13of 19 · score 63.9
Data coverage
92%
24 of 26 fields sourced
Best for
- •Building an AI app builder with live previews
- •You want git hosting and custom domains bundled with execution
- •JavaScript and TypeScript workloads only
Strong on
None stand out.
Weak on
- −Custom images No 17/19Better: E2B: Yes
- −Max runtime 1h 15/18Better: E2B: 24h
- −Concurrent limit 40 sandboxes 14/15Better: Vercel Sandbox: 2,000 sandboxes
- −Browser inside No 15/18Better: E2B: Yes
vs Blaxel
- •Ahead on Egress control: allowlist vs open
- •Ahead on Persistent FS: Yes vs Partial
- •Behind on Custom images: No vs Yes
- •Behind on Max runtime: 1h vs 24h
How Freestyle scores among 19 sandbox providers24 of 26 fields known
Runtime13
Cold start
700ms
7/16
Leader: Riza · 120ms
Cold start (claimed)
—
Max runtime
1h
15/18
Leader: E2B · 24h
Persistent FS1st
Yes
1/19
Snapshot & fork
Partial
6/19
Leader: Daytona · Yes
Custom images
No
17/19
Leader: E2B · Yes
GPU
No
6/15
Leader: Modal · Yes
Runtimes
javascript-typescript, python
10/18
Leader: boat · python, javascript-typescript, bash, go, rust, java, ruby, php, any-oci-image
Browser inside
No
15/18
Leader: E2B · Yes
File up/download1st
Yes
1/19
Sydney region
No
8/18
Leader: Fly.io Machines · Yes
Isolation & network3
Isolation1st
microvm
1/19
Root in guest
Partial
16/19
Leader: E2B · Yes
Egress control1st
allowlist
1/19
Agent integration3
MCP server
Partial
6/18
Leader: Daytona · Yes
SDKs
typescript, rest-api
11/19
Leader: Runloop · python, typescript, rest-api, cli
Streaming output1st
Yes
1/17
Pricing3
Meter2nd
per-request
2/19
Leader: Cloudflare Sandbox · per-10ms
Idle cost
storage-only
9/19
Leader: Fly.io Machines · free-when-stopped
Traction2
GitHub stars
—
Funding
seed
9/15
Leader: Fly.io Machines · series-c-plus
Positioning1
Positioning
The backend for AI app builders: run code, host git, serve previews, attach domains.
Timeline1
Shipped
2024
5/16
Leader: Daytona · 2025
Blaxel
boat
Cloudflare Sandbox
CodeSandbox SDK
Daytona
Self-hosted Firecracker
E2B
exe.dev
