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.
Easy to set up and use, valuable information to help with fixing client side bugsCons:
A little pricey for small projects
The team at TrackJS are really helpful. This is a quality product that will make any browser based product better.Stuart Bale has used this product for one year.