Off-topic but I'd never heard of CatchJS before. As the founder of TrackJS[1] I can't help but feel they were heavily inspired by our product... almost too inspired considering their logo and marketing copy.
(We've been around since 2014, so we pre-date them by 4 years)
(We've been around since 2014, so we pre-date them by 4 years)
[1] https://trackjs.com