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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AudioAlerts.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
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.