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Raygun notifies you when JS errors occur in your app with intelligent grouping and the complete stack trace in real time. Whether your code is running in a data center or on a million mobile devices, Raygun gives you the data you need to fix bugs fast. Discover critical bugs that are visible to the most users, while going unnoticed by your team. Counts of affected users are displayed alongside each error group.
Atatus, a frontend JavaScript error tracking service, lets you capture JavaScript errors on a number browsers such as IE, Firefox, Chrome, Safari, Edge etc. and lets you capture AJAX errors as well. Atatus has 4 plans - basic
JavaScript Error Tracking Tools