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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.

PagerDuty is an alarm aggregation and dispatching service for system administrators and support teams. It collects alerts from your monitoring tools, gives you an overall view of all of your monitoring alarms, and alerts an on duty engineer if there's a problem.

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.

OpsGenie is a cloud-based service for dev & ops teams, providing reliable alerts, on-call schedule management, and escalations. OpsGenie integrates with monitoring tools & services and ensures that the right people are at the right time.

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.

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!

VictorOps is a real-time incident management platform that combines the power of people and data to embolden DevOps teams so they can handle incidents as they occur and prepare for the next one.

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.

Site24x7 is an all-in-one monitoring solution that allows you to monitor every part of your IT infrastructure from Websites to Applications, to Servers (both on-premise and on the cloud) as well as your Network infrastructure.

Healthchecks.io is a monitoring service for your cron jobs, background services and scheduled tasks. It works by listening for HTTP "pings" from your services. You can set up various alert methods: email, Slack, Telegram, PagerDuty, etc.

It is a self-hosted, open-source, fancy uptime monitoring, and alerting system. It can monitor HTTP, HTTP with keywords, TCP, Ping, and even DNS systems!

It gives you insight on how well your site loads and provides actionable recommendations on how to optimize it. It is a free tool that analyzes your page's speed & performance.

It is an all in one uptime monitoring tool which monitors your URL from 10 locations around the globe ensuring that if your website ever goes down again, you get alerted within 60 seconds. It comes with advanced capabilities like SSL Monitoring, Advanced Alerting and more.

Checkly is the API & E2E monitoring platform for the modern stack: programmable, flexible and loving JavaScript. Free for developers!

Bigpanda helps you manage and respond to ops incidents faster. All your alerts: organized, assignable, trackable, snoozeable, and updated in real-time.

Monitoring systems are often complex and require a strong sysadmin background to properly configure and maintain. Cronitor replaces all this with a simple service that anyone can set up. Receive email/sms notifications if your jobs don't run, run too slow, or finish too quickly.

It is an easy way to track the uptime & SSL health for your websites & apps. It's website monitoring without the hassle. Multi-location uptime monitoring, mixed content detection and SSL certificate & transparency reporting. There's an API and kick-ass documentation too.

It is a Slack-native incident response and management tool that scales as your team grows. Hypergrowth companies use it to automate incident processes, focus on fixing the issue, and learn from incident insights to improve site reliability and fix vulnerabilities.

It provides website and server availability monitoring. At its most basic, the service lets users enter a list of addresses of web site addresses or other Internet based services, and then checks to see if that site or service is responding properly

AlertBot's Website Monitoring provides businesses with around the clock testing of their website pages. This monitoring includes the testing of all possible webpage failure points as well as the verification of key performance metrics. This data gives businesses the information they need to ensure their websites are always running error-free and providing a quality user experience.

It is an end-to-end incident response platform that helps tech teams adopt SRE best practices to maximize service reliability, accelerate innovation velocity and deliver outstanding customer experiences.

It is an alert aggregation and incident management service for IT and DevOps teams. It is a real-time SaaS platform that combines collaboration with alert management so you can handle critical incidents as they occur. With our quick escalations, the right alerts are delivered to the right people enabling increased agility to your team. Our mobile app and integrations allow you to get alerts through SMS, push notifications, and email so you never again miss a critical alert.

WebGazer is a monitoring service that checks your website, cron jobs or scheduled tasks on a regular basis. It notifies you with instant alerts in case of a problem.

Spike.sh is an incident response platform built for modern teams. Spike.sh integrates with your monitoring tools and alerts on phone call, SMS, Slack, MS Teams, Whatsapp, and Telegram.

It monitors your website, dashboards, API's, and more and alerts your team when downtime happens. We also give you a Status Page which keeps your customers looped in and improves transparency.

web-alert.io is a simple uptime and API monitoring service built for developers, indie hackers, and small SaaS teams who want clear, reliable alerts without enterprise complexity. It monitors websites and API endpoints, sends instant downtime alerts, checks SSL certificates, and tracks response times — all inside a clean, minimal dashboard. Setup takes under a minute, and there’s a free plan included. Perfect for small projects, micro-SaaS, client sites, and devs who just want to know when something is down.

Modern uptime and performance monitoring for websites and APIs, with rich reporting, flexible alerting, and competitive pricing. More than just HEAD requests: choose an HTTP method, headers, and body for any request.

It provides improvement points to locate the source of problems in hidden areas that were not found in other products.

Uptime.com provides peace of mind to thousands of customers like Apple, Microsoft, IBM, Palo Alto Networks, Kraft, and BNP Paribas who trust us to monitor the performance, health, and downtime of their websites.

Nothing’s more important than a great customer experience, but sometimes services get disrupted. It helps teams resolve issues fast before they impact customers.

It is an easy-to-use on-call management tool that will help reduce toil in on-call management through simpler workflows and interfaces tailored for devs.

Website performance monitoring, simplified for small teams. It's not a expensive APM "solution" or a complex query language to learn. It is the key metrics you need to know to keep your website running fast and your customers happy.

End to end incident management platform for SRE, DevOps, Network Operations, Infrastructure and Security Operations teams

FireHydrant is a modern incident management tool allowing your SRE and DevOps team to resolve, learn from, and mitigate incidents in the future.

When it comes to downtime, seconds count. We monitor your site around-the-clock to make sure it never skips a beat. We offer HTTP, HTTPS, RUM, DNS, ICMP, IMAP, POP3, SMTP, TCP, UDP, and Transaction monitors.

It manages security incidents by deeply integrating with existing tools used throughout an organization (Slack, GSuite, Jira, etc.,) It is able to leverage the existing familiarity of these tools to provide orchestration instead of introducing another tool.

Pingbreak is an original and free monitoring service. Get notified if your website is down. Pingbreak checks all of your websites each minute and alert you instantly by Direct Message on Twitter, WebHook, Discord channel, Slack or Mattermost.

Picreel converts website visitors to customers with custom popups, advanced targeting, segmentation, and A/B testing for maximum campaign optimization.

Build your status pages within minutes. The best FREE status page alternative that provides superior status page customisation along with incident communication features. Seamlessly integrate with other tools via Webhook & APIs.

Receive alerts when your website or API is down through emails, Slack or SMS, integrated with real time data and insights

It is a command line application to monitor every part of your web app using a simple JSON configuration file. Get alert not only when your site is down but also when it's slow.

It is an incident management platform built on Slack. It helps automate manual admin work during incidents like the creation of Slack channels, Jira tickets, Zoom rooms & more.

It is a web monitoring tool that keeps you up to date and up to speed. If you're looking to keep track of updates on any website or social platform, it is the tool you need.

It is an Infrastructure monitoring as a service for public/private cloud, on-prem and hybrid environments. Built for SaaS, e-commerce, service providers and enterprise.

Using our stories feature, you can test many different features of your live, production website. It could be you need to find out if logins are working. Whatever it is, StillAlive can (or will) be able to test it.

It is a web-based service that monitors the availability and loading speed of any website, server, network, basically any network asset you grant access to. After failure detection, it alerts you in numerous ways. It's most distinguishable service is its transaction monitoring and custom scrips.

It is an incident management tool with Status Pages that product owners, developers, teams or startups use to inform their audience about any service related issues with ease. It also includes an Automated Downtime Detection.

It is an open-source monitoring service that provides on-call management, incident alerts, and status pages. It allows users to monitor their website or API, create custom headers, and define the region and frequency of automatic checks.

It is a status page aggregator & outage monitoring tool for all your business-critical dependencies. Easily monitor with a health dashboard with all your external services. Instant notifications on outages. All in one place.

It is the first dedicated incident analysis platform that combines more comprehensive data to deliver more proactive solutions and identify problems.