What are some alternatives?
When comparing Screaming Frog SEO Spider and updown.io, you can also consider the following products
Pulno - SEO Audit and Website Analysis. Pull up your SEO.
Pingdom - With website monitoring from Pingdom you will be the first to know when your website is down. No installation required. 30-day free trial.
Moz - Backed by industry-leading data and the largest community of SEOs on the planet, Moz builds tools that make inbound marketing easy.
UptimeRobot - Free Website Uptime Monitoring
Netpeak Spider - A desktop tool for fast and comprehensive technical audit of the entire website.
StatusCake - StatusCake | Website Uptime Monitoring & Alerts – Free Unlimited Downtime Monitoring