What are some alternatives?
When comparing SEO Crawler and VWO, you can also consider the following products
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Hotjar - Hotjar is a new and easy way to truly understand your web and mobile site visitors.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Optimizely - A/B testing you'll actually use.
Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.