Sitespeed.io is described as 'Open source performance measurement and monitoring for web sites'. There are more than 10 alternatives to Sitespeed.io for a variety of platforms, including Online / Web-based, SaaS, Self-Hosted solutions, Android and iPhone. The best alternative is Pingdom. It's not free, so if you're looking for a free alternative, you could try GTmetrix or New Relic. Other great apps like Sitespeed.io are Pingdom Website Speed Test (Free), Request Metrics (Paid), Up Ninja (Paid) and wattspeed (Free).
Pingdom web site monitoring and other infrastructure for you and instantly let you know when anything goes wrong. Measure uptime, downtime, and the performance of your website as experienced by visitors.
Pinpoint and solve performance issues in your Ruby, Java, .NET, PHP and Python apps with real user, application and server monitoring. Free accounts can ping a website every 1 minute, from multiple locations around the globe, and send email alerts.
Use this free Website Speed Test to analyze the load speed of your websites, and learn how to make them faster. Nobody Likes a Slow Website We built this Website Speed Test to help you analyze your website load speed.
Monitor uptime,response timeandapdex indexes of your website or api for free and receive instant updates through e-mail or Slack with real time announcements. Don't leave your customers in the dark during downtime & outages of your website.
Wattspeed is a free tool that generates snapshots - historical captures of your web pages that include Lighthouse scores, a list of technologies, W3C HTML validator results, DOM size, mixed content info, and more.
Unlimited monitors checked from multiple location every minute. Monitor any port or setup a "heartbeat" that works well for cron jobs or any service behind a firewall. Be alerted as soon as your service is offline via email or app integration.