"Checkbot is a Chrome extension that tests 100s of pages at a time to find SEO, speed and security problems before your users do. Test unlimited sites as often as you want including local development sites to find and eliminate broken links, duplicate content, invalid HTML/CSS/JavaScript, insecure pages, redirect chains and 50+ other common website problems."
I frequently think about doing writing an app or web service, but then talk myself out of it by thinking that the effort is much greater than it sounds and those efforts would be better off trying to progress my career.
It's a lot of effort to launch stuff but with that you get a lot of rounded experience and perspective from it you might not get elsewhere even if you don't make a profit. For example, you'll have to do at least a little marketing, content generation, web design, UI design and product design on top of regular programming. This all helps your next app launch be successful and maybe your future career is working for yourself. Not everything is about money either.
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I bootstrapped this myself:
https://www.checkbot.io/
"Checkbot is a Chrome extension that tests 100s of pages at a time to find SEO, speed and security problems before your users do. Test unlimited sites as often as you want including local development sites to find and eliminate broken links, duplicate content, invalid HTML/CSS/JavaScript, insecure pages, redirect chains and 50+ other common website problems."
It's a lot of effort to launch stuff but with that you get a lot of rounded experience and perspective from it you might not get elsewhere even if you don't make a profit. For example, you'll have to do at least a little marketing, content generation, web design, UI design and product design on top of regular programming. This all helps your next app launch be successful and maybe your future career is working for yourself. Not everything is about money either.