JSMonitor.io
Monitor actual user JavaScript errors as they happen.
AppEnlight
AppEnlight provides performance, exception, and uptime monitoring for the web.
Yeller
Yeller enables developers to track the errors their users hit in their application and fix them instantly.
Exceptionless
Don’t let your users walk away in frustration.
Firebase Crashlytics
The most powerful, yet lightest weight crash reporting solution for iOS and Android developers. | Crashlytics.
Datadog
See metrics from all of your apps, tools & services in one place with Datadog’s cloud monitoring as a service solution. Try it for free.