FancyTrack vs JSNLog
When comparing FancyTrack vs JSNLog, the Slant community recommends JSNLog for most people. In the question“What are the best JavaScript client-side error logging services?” JSNLog is ranked 17th while FancyTrack is ranked 18th. The most important reason people chose JSNLog is:
Not a hosted option, so you'll store client-side logs along with your server-side logs.
Specs
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Pros
Pro Light
Pro Free
Pro Integrates with your existing server-side logging package
Not a hosted option, so you'll store client-side logs along with your server-side logs.
Pro Stack traces
JSNLog passes exception log messages with its stack trace.
Cons
Con Is not supported by IE Edge
But at the moment it overrides window.onerror handler.
window.onerror is not supported by IE Edge.
Con No hosted option
You'll have to store client-side logs along with your server-side logs.
Con No reporting capabilities
Your server logging solution should provide that, and JSNlog integrates with Elmah, Log4Net, NLog, Serilog, Common.Logging.