More about the 5 Best Frontend Error Monitoring Tools.
Rollbar and BugSnag are both Enterprise APM and observability platforms with metered usage and high price tags. BugSnag has better tools to manage error data, but Rollbar provides better support. For a cheaper, front-end error tracking alternative, consider TrackJS.
With TrackJS, the focus is on errors occurring on the browser. Filtering is second to none, and the quick views of trending errors are helpful in digging past the 3rd party script noise. It filters down to the core issues.