Review of CatchJS powered by the Slant community.
CatchJS is javascript error tracking service. It logs all uncaught exceptions in the browser, and gives you a log of their circumstances and context. Can take screenshots of when the error happened and collect click trails from the browser.
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Pros
Pro Notifications when things break
Can send emails when new errors happen.
Pro Shows code snippets
Shows code snippets of the error and applies source maps automatically.
Pro Doesn't slow down page loads
Has a very small filesize, so it doesn't slow down page loads.
Pro Screenshots really help debugging
It takes a screenshot of the screen, so you can see what the user was looking at when the error happened.