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CodeSandbox SDK

Firecracker VMs with memory snapshots, from the online IDE, now owned by Together AI.

codesandbox.io/docs/sdkcodesandbox.io/docs/sdk
Overall in sandbox providers
8of 19 · score 72.9
Data coverage
100%
26 of 26 fields sourced

Best for

  • •You fork one prepared environment many times
  • •Long-lived per-user environments that hibernate between sessions
  • •You need processes and memory preserved, not just the disk

Strong on

  • +Snapshot & fork Yes 1/19
  • +Runtimes python, javascript-typescript, bash, any-oci-image 2/18

Weak on

  • −Egress control open 15/19
    Better: Daytona: allowlist
  • −MCP server No 13/18
    Better: Daytona: Yes
  • −Cold start (claimed) 1s 8/12
    Better: Blaxel: 25ms

vs E2B

  • •Ahead on Snapshot & fork: Yes vs Partial
  • •Ahead on Persistent FS: Yes vs Partial
  • •Behind on MCP server: No vs Partial
  • •Behind on Browser inside: Partial vs Yes

How CodeSandbox SDK scores among 19 sandbox providers26 of 26 fields known

Runtime13

Cold start
1.2s
10/16
Leader: Riza · 120ms
Cold start (claimed)
1s
8/12
Leader: Blaxel · 25ms
codesandbox.io · 2026-01-15
Max runtime1st
24h
1/18
Persistent FS1st
Yes
1/19
codesandbox.io · 2026-01-15
Snapshot & fork1st
Yes
1/19
codesandbox.io · 2026-01-15
Custom images1st
Yes
1/19
GPU
No
6/15
Leader: Modal · Yes
Runtimes2nd
python, javascript-typescript, bash, any-oci-image
2/18
Leader: boat · python, javascript-typescript, bash, go, rust, java, ruby, php, any-oci-image
Preview URLs1st
Yes
1/19
codesandbox.io · 2026-01-15
Browser inside3rd
Partial
3/18
Leader: E2B · Yes
File up/download1st
Yes
1/19
codesandbox.io · 2026-01-15
Sydney region
No
8/18
Leader: Fly.io Machines · Yes
Concurrent limit
100 sandboxes
5/15
Leader: Vercel Sandbox · 2,000 sandboxes

Isolation & network3

Isolation1st
microvm
1/19
codesandbox.io · 2026-01-15
Root in guest1st
Yes
1/19
Egress control
open
15/19
Leader: Daytona · allowlist

Agent integration3

MCP server
No
13/18
Leader: Daytona · Yes
SDKs
typescript, python
11/19
Leader: Runloop · python, typescript, rest-api, cli
Streaming output1st
Yes
1/17
codesandbox.io · 2026-01-15

Pricing3

Price / hour
$0.15/hr
7/17
Leader: boat · $0.018/hr
codesandbox.stream · 2026-11-07
Meter2nd
per-second
2/19
Leader: Cloudflare Sandbox · per-10ms
Idle cost
storage-only
9/19
Leader: Fly.io Machines · free-when-stopped

Traction2

GitHub stars
13,000
4/7
Leader: Daytona · 71,000
Funding
acquired
5/15
Leader: Fly.io Machines · series-c-plus

Positioning1

Positioning
The VM infrastructure behind CodeSandbox, sold as an SDK.

Timeline1

Shipped
2024
5/16
Leader: Daytona · 2025

Alternatives8

Compare

Sources2

CodeSandbox SDK logo & brand colours

Logo assets

LogoSVG
Download
MonochromeSVG
Codesandbox logo

Flattened to currentColor, what Toolweight renders in tables and nav.

Download

Codesandbox brand colours

#DCFF50