TrackJS JavaScript Error Monitoring - Discover the bugs in your web applications and fix them fast
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TrackJS gives you context about what's happening in your end-users' browsers. The Telemetry timeline recreates all the application, network, and user activity that leads to an error. The stack trace processing shows you the code you need to investigate.

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Reply.io
The team at TrackJS are really helpful. This is a quality product that will make any browser based product better.
Pros:Easy to set up and use, valuable information to help with fixing client side bugs
Cons:A little pricey for small projects
AudioAlerts.io
TrackJS has been very helpful for finding bugs on a production sites before they are reported by users. I haven’t used the competition recently but when I first settled on trackjs was because it was by far the easiest to set up and get started on for browser-based js apps.
Pros:Easy to install, clear & detailed info about errors
Cons:No screenshots or mouse tracking. May need to set up come custom tracking to trackjs for unusual cases.
TrackJS is definitely the best browser errors reporting tool I have ever used! I have tried Newrelic, Muscula and custom solutions but none of them could compete with TrackJS.
The most valuable feature for us is "Users impacted" overview, which basically defines the priority of error, also it helps to filter our the noise that comes from different browser extensions that users have. Great product!
Pros:Clean stack traces, telemetry timeline, users impacted overview, different reports and notifications
Cons:Minor thing - source map support can be better.