When comparing JSNLog vs Errorception, the Slant community recommends Errorception for most people. In the question“What are the best JavaScript client-side error logging services?” Errorception is ranked 10th while JSNLog is ranked 17th. The most important reason people chose Errorception is:
Errorception's script loads incredibly fast on your webpage, without affecting your site's load time at all.
Specs
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Pros
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.
Pro Extremely high performance
Errorception's script loads incredibly fast on your webpage, without affecting your site's load time at all.
Pro Reasonable pricing
Even though the company offers no free plan, their other plans are quite reasonably priced, with the micro plan starting at just $5 a month and a 500 errors/month quota.
Pro Provides all necessary Error tracking features
Errorception, along with its competitors provides the same vast set of tools, to make your life easier. Features include grouping of errors, noise reduction (caused by misbehaving plugins in client browsers), error filtering and Email alerts as well.
Cons
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.
Con No Free Plan
Even though Errorception does offer a Free (No credit Card required) 30 day trial, the bug tracking service does not offer a Free plan, unlike some of the other services in the list.