

The error list, filtered to fatal errors, showing the responsible plugin or theme for each one.
Your uptime monitor tells you when the whole site is down. It says nothing when a plugin conflict breaks only your checkout page, your contact form, or your admin dashboard — while the homepage still returns a cheerful 200 OK. Most site owners find out about those failures when a customer complains.
ZeroFatal watches for the failures a status check misses. When PHP hits a fatal error, ZeroFatal records what happened, works out which plugin or theme is responsible, and emails you before anyone else notices.
Freelancers and agencies looking after client sites, and anyone who would rather hear about a site crash from their inbox than from a customer.