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Professional website monitoring service - Monitor uptime, content changes, DNS health, and security threats. | Free uptime monitoring that tests what matters. Monitor APIs, validate responses, test multi-step workflows, and verify real browser logins. |
website monitors, AI, DNS Monitor, Ping Monitor, Malware Scan, Blacklist, SSL | Browser Login Checks, Multi-Step API Monitoring, Response Body Validation, JSON Path Assertions, Failure Screenshots, Email Alerts, Slack Alerts, Webhook Alerts, PagerDuty Integration, Free Commercial Use |
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Pingdom is an uptime monitoring service. When problems happen with a site that Pingdom monitors, it immediately alerts the owner so the problem can be taken care of.

Better Stack is a radically better infrastructure monitoring platform that calls the right person on your team if anything goes wrong. Schedule on-call duties, receive helpful alerts, and collaborate on solving incidents faster than ever.

It is a free, automated, and open certificate authority brought to you by the non-profit Internet Security Research Group (ISRG).

It is all about helping you to keep your websites up. It monitors your websites every 5 minutes and alerts you if your sites are down.

Monitoring a website is one thing – finding the best way to alert you to downtime another. At StatusCake we give you as many options as possible to decide when & how often you’re contacted. Whether it’s by email, SMS, push notifications for iOS & Android or integration with third party apps including Zapier and PagerDuty – you decide how you want to be alerted and when!

Sqreen is a security platform that helps engineering team protect their web applications, API and micro-services in real-time. The solution installs with a simple application library and doesn't require engineering resources to operate. Security anomalies triggered are reported with technical context to help engineers fix the code. Ops team can assess the impact of attacks and monitor suspicious user accounts involved.

updown is an online service that checks your website's status by periodically sending an HTTP HEAD request to the URL of your choice. It then notifies you by email or sms when your website is not responding correctly.

Add a powerful, simple and flexible 2FA verification view to your login flow, without making any DB changes and just 3 API calls.

Catch visual bugs in static & dynamic UI components with Percy. Ensure your website’s UI reliability in dynamic environments. Detect and resolve bugs at speed for each component across browsers and viewports.

It lets you create and manage UI tests that check specific functionality in your website or application. We execute these automated browser tests continuously from the cloud and alert you if anything breaks.