Testomato!

Monitors your websites every 5 minutes, totally free. Get alerts by e-mail, SMS, Twitter or RSS. Add up to 50 websites. Monitors can be refreshed for an instant check with a click. Supports https and authentication with user/password.

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.

Comprehensive website and web application monitoring:* simulate a real browser (Firefox) to check performance* services monitoring (FTP(S), DNS, PING, TCP, SSL, SMTP, POP)* user experience monitoring (browser load time per user-agent, response time in various platforms* response time and throughput of each web transaction with graphical representation for quick performance insight* performance stats by ISP* application performance monitoring (monitor Java, .NET and Ruby on Rails web transactions and drill down to offending code and pinpoint root cause of issues from the cloud)* cloud monitoring (Amazon EC2, RDS instances and S3 Bucket)* VMware Monitoring* server Monitoring (Linux, Windows)* On-Premise Poller to monitor intranets* monitor from 3G/4G carriers* DNS server monitoring* SSL certificate expiration monitoring* notifications via SMS, Email, Push Notifications, Twitter and RSS Feeds* mail server, Exchange, FTP monitoring* API, user management* Root Cause Analysis - a comprehensive report based on trace route, ping output, DNS reports and web page screenshots that gives you a conclusion on what caused the issue »

Uptime monitor for server. Currently fully free (beta) so it is subjected to change. Allows to monitor unlimited servers and websites. With custom CNAME you can create live status pages.

Free & Simple website monitoring

Make sure that your website remains available for your customers at any time! Monitor all of your web services (database, servers, web site, ...) 24/7 thanks to our check locations in Europe/USA. Be the first to be alerted (via email, SMS, Twitter, Slack, ...) as soon as your website is down.Track and Analyze your website performance with reports available in PDF (load time, availability %, ...).Platform available in 5 languages: Dutch, English, French, German and Spanish.Many protocols available: http, https, smtp, ftp, dns, pop, imap, smtp, nntp, tcp, udp, ping, mysql »

Netthrob’s servers take their job very seriously. They buzz vigorously from five strategic locations across the world and track the uptime of your website. The coordinated monitoring action from different geo locations gives a very accurate status of your website’s uptime and downtime. Netthrob can precisely point out geography-specific visitor experiences so that you can alter your Content Delivery Network (CDN) resourcing accordingly.

We offers paid website monitoring services. Monitor websites remotely and receive instant email alerts if your website becomes unavailable.