Recs.
Updated
Monitor application errors to improve customer experiences and code quality with Bugsnag. Quickly filter errors by occurrences or users impacted so you can decide if an error needs to be fixed now or snoozed for later. Troubleshooting and reproducing errors is easier with automatically collected diagnostic data which saves you time scouring log files. Over 3,500 of the world's best engineering teams from organizations like Airbnb, Eventbrite, and Shopify use Bugsnag to build better software.
SpecsUpdate
Pros
Pro Custom filtering
There is is a filter building bar at the top of the main view to filter down to only bugs you are interested in, but there is also a feature to add a filter on custom information.
Pro Great documentation
Clear, concise documentation. Plus docs on cross-domain script errors and enabling CORS.