More about the 5 Best Frontend Error Monitoring Tools.
Rollbar is positioning as an Enterprise APM service with observability tools and a high price tag. DataDog is the larger incumbent in that space with an even higher price tag and broader platform support. For a cheaper, web 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.