Is CodeSandbox secure?

Legit.Show measured CodeSandbox's Security frame at 25/100. No Content-Security-Policy and no HSTS. Served over HTTPS with a valid certificate.

How does Legit.Show measure CodeSandbox?

Legit.Show scores seven frames — Performance, Accessibility, Security, Privacy, Reliability, Standards and Discoverability — deterministically from the public surface (URL, HTTP headers, real Lighthouse), with no LLM in the scoring path. See legit.show/methodology.

Developer Tools

CodeSandbox

Last updated 2026-08-03 · benchmark measured 2026-09-15 — deterministic & reproducible

Cloud development environments for AI agents, coding playgrounds, and teams.

60/100

7/7 frames

Top 91% of 14,138 measured · #12 of 12 in online code editor

Legit Benchmark — the simple average of 7 measured frames. Frames we could not measure are left out of the average, never counted as zero. Every frame is shown below with its evidence.

Checked 2026-09-15 · scores move as sites change

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To cite this score: legit.show/s/codesandbox-io/2026-09-15. That address never changes; this page moves with every re-measure.

Legit.Show scored CodeSandbox 60/100 on 2026-09-15, measured across all 7 frames from its public surface. legit.show/s/codesandbox-io/2026-09-15

Is CodeSandbox production-ready?

Legit.Show scores CodeSandbox 60 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on CodeSandbox (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Accessibility; its weakest is Privacy. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

Performance — 55/100
Accessibility — 95/100
Security — 25/100
How this compares across the catalogue: The Web Security Baseline
Privacy — 25/100
How this compares across the catalogue: The Privacy Gap
Reliability — 70/100
Standards — 89/100
Discoverability — 60/100

What we measured

No Content-Security-Policy and no HSTS.
Served over HTTPS with a valid certificate.
Real Lighthouse performance run — 491 ms to first byte.
Returns a proper 404 for unknown routes.
0 of 3 sampled routes reachable.
No privacy policy found.
Sets cookies / loads scripts with no consent prompt.
Discoverable: OpenGraph image.

Who built it

product account @codesandbox

Who it's for

AI agents · Developers · Students · Teams · Educators

Sources and updates

Description: Taken from codesandbox.io's own website on 2026-08-03.
Operator: CodeSandbox BV, as named in codesandbox.io's terms, privacy page or footer.
Benchmark: Measured by Legit.Show from the live site, the way any visitor sees it — with no access to its code or accounts. Same method for every product, and no AI decides the score. Last checked 2026-09-15.

Put together from public information, without CodeSandbox's involvement. If anything here is wrong, tell us and a person will check it.

Visit CodeSandbox → · Alternatives to CodeSandbox → · How this was measured →