Rollbar vs Errorception

This feature is quite an interesting technical feat, considering that it shouldn't really be possible to get error information form 3rd party scripts. See this and this for discussions.

Free plan allows for up to 5000 events/month, customizable rate limits, integrations (e.g. with Slack), multiple users, and 30 day retention.

Rollbar can be integrated with Slack to send notifications of various event to a set Slack channel based on customizable rules.

Stack trace with function calls and line numbers.

At least as of 2015-July-14. Many other prominent loggers are blocked, e.g. Loggly and LogEntries.

Rollbar allows sending any log messages to Rollbar not just exceptions enabling you to go back and check for missed exceptions.

You can easily send "deploy" events with curl, so that you know to which version the errors apply. Errors are grouped automatically by name/type, but if the re-occur after a deploy, they'll be shown again above the deploy in the timeline.

Asana - Create and resolve Asana tasks

Bitbucket Issues - Create and manage Bitbucket Issues

Campfire - Get alerts in your Campfire room

Flowdock - Get messages in your flow

GitHub Issues - Create and manage GitHub Issues

HipChat - Get alerts in your HipChat room

JIRA - Create, resolve, and reopen JIRA issues

PagerDuty - Trigger and resolve incidents in PagerDuty

Pivotal Tracker - Create and manage Pivotal Tracker stories

Slack - get alerts in a chatroom or group

Sprintly - Create and manage Sprintly items

Trello - Create and manage cards in Trello

VictorOps - Trigger and recover alerts in VictorOps

Webhook - Post JSON payloads to arbitrary URLs

Email - get notifications and daily summaries

Source map support is used to reference original source code in cases where the code is minified.

Rollbar allows ignoring specific exceptions simply by adding the error message to the ignoredMessages array.

Errorception's script loads incredibly fast on your webpage, without affecting your site's load time at all.

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.

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.