Show HN: Fault Sense – An Application Feature Monitor for Web Apps (faultsense.org)

If you’ve ever been asked, “Conversions for XYZ are down. Did something break on the site?” this might resonate.

Fault Sense is the library I wish existed to answer the kinds of questions product analytics and tracing tools can’t: when something should happen, but doesn’t. Tracing tools get close, but they’re heavy and invasive to instrument.

Fault Sense stays lightweight. It’s language and framework agnostic — drop in a script tag, annotate your HTML, and you’re done. It lives at the edge of your application and can be turned off just by removing the script tag.

It’s still a work in progress, but I’d love feedback if you’ve faced similar “is it broken?” moments.