Developer Tools

501see

Last updated 2026-08-26 · benchmark measured 2026-08-26 — deterministic & reproducible

Self-serve API for nonprofit and IRS 990 data, no sales process required.

Is 501see production-ready?

Legit.Show scores 501see 78 out of 100 — the simple average of its 7 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on 501see (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Reliability; its weakest is Security. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

• Performance — 73/100
• Accessibility — 93/100
• Security — 25/100
• Privacy — 75/100
• Reliability — 100/100
• Standards — 92/100
• Discoverability — 85/100

What we measured

• No Content-Security-Policy and no HSTS.
• Served over HTTPS with a valid certificate.
• Real Lighthouse performance run — 132 ms to first byte.
• Returns a proper 404 for unknown routes.
• 3 of 3 sampled routes reachable.
• Has a reachable privacy policy.
• Sets cookies / loads scripts with no consent prompt.
• Discoverable: sitemap, OpenGraph image, canonical URL.

Who it's for

Developers · Researchers · Nonprofit power users · Data teams · Analysts

Pricing

Free tier available; Basic $49/month; Pro $99/month

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