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Free uptime monitoring that tests what matters. Monitor APIs, validate responses, test multi-step workflows, and verify real browser logins. | UptimeSignal is synthetic monitoring built for developers and small teams. Add your URLs, we check them every minute from multiple locations, and alert you via email, Slack, Discord, or Telegram when something breaks. Key differences from other monitoring tools: Generous free tier (25 monitors) that allows commercial use Flat $15/month for unlimited monitors (no per-monitor pricing) Public status pages included free Simple setup - just paste a URL, no complex configuration Built for indie hackers, startups, and small teams who need reliable monitoring without enterprise complexity or pricing. |
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 | status pages, free plan, uptime monitoring, synthetic monitoring, uptime badges |
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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 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!

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.

The #1 status and incident communication tool. Use Statuspage to build trust with every incident.

Cachet is an open source status page system written in PHP, using the Laravel framework.

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.

Applitools delivers the next generation of test automation powered by AI assisted computer vision technology known as Visual AI. Visual AI helps Developers, Test Automation Engineers and QA professionals release high-quality web and mobile