What are some alternatives?
Screaming Frog SEO Spider - The Screaming Frog SEO Spider is a small desktop program (PC or Mac) which crawls websites’ links...
Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
ContentKing - The world's only Real-time SEO Auditing and Content Change Tracking suite.
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Seodity - The complete SEO toolkit for improving your projects.
Checkbot - Checkbot will boost the SEO, speed and security of your site by checking you're following 50+ web best practices. Browser extension with free and paid plans.