Trust & transparency

A concise overview of Leo, Nox's medical-safety layer: what it does, its published aggregate testing, its limits, and where to find the detailed accuracy report.

Safety at a glance

Leo screens consumer messages for signs that something may need urgent care before Nox answers. If something may be urgent, Nox puts clear care-seeking guidance before its answer. Leo is a safety net, not a diagnosis or a guarantee.

Published aggregate testing

• Overall recall: 100.0% (150 of 150 should-fire cases produced a safety note)
• False-positive rate: 0.0% (0 of 53 benign cases triggered a note)
• Test set: 203 labeled cases · 107 rules across 75 categories

These results cover a maintained internal test set for Leo's safety screening. For the full methodology, scope, and detailed results, <a href="/accuracy">read the Accuracy &amp; testing report</a>.

Limits and accountability

Nox is an educational companion, not a medical device or replacement for a clinician. It does not claim to catch every emergency, and independent clinician review is not yet complete.

Learn more about <a href="/privacy/">privacy</a>, <a href="/how-it-works">how Nox works</a>, and <a href="/accuracy">how Leo is tested</a>.