Total Products under this Category: 307
Last updated: October 11, 2026
Why You Can Trust G2's Software Rankings:
G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.
Highlighted products: Site24x7, UptimeRobot, Uptime.com, Datadog, Better Stack, IBM Instana, Dynatrace, and Pulsetic.
Underlying data: [Grid® JSON](https://www.g2.com/categories/website-monitoring/grids.json?focus%5B%5D=site24x7&focus%5B%5D=uptimerobot&focus%5B%5D=uptime-com&focus%5B%5D=datadog&focus%5B%5D=better-stack&focus%5B%5D=ibm-instana&focus%5B%5D=dynatrace&focus%5B%5D=pulsetic)
NoMore404 checks your sites, API servers, mail servers, name servers and SSL/TLS certificates, and confirm every failure from two other continents before anyone is contacted. Command Line Interface, API and MCP servers are available for integrations.
Notifier monitors your websites, APIs, and servers around the clock and alerts you the moment something goes down. It checks as often as every 30 seconds and sends notifications through email, SMS, voice calls, and Slack so you never miss an outage.
Observer is a comprehensive SaaS web application designed to monitor, analyze, and optimize websites in real-time. It offers a wide range of features including uptime and performance tracking, SEO suggestions, periodic backups, reporting and archiving, and advanced AI-driven insights, all aimed at ensuring your website runs efficiently and remains highly visible to your audience. With Observer, users can register for free and immediately start using the basic version, which provides essential monitoring capabilities. This free option allows users to keep an eye on their website’s uptime and basic performance metrics, making it easy to spot potential issues early and maintain a healthy online presence without any upfront costs. Observer’s intuitive interface and straightforward setup make it accessible for users of all technical backgrounds, enabling anyone to quickly get started with monitoring their website’s health. For those who need more advanced tools, Observer also offers a monthly paid subscription. This premium version includes all the advanced features of Observer, such as in-depth SEO suggestions tailored to your website, comprehensive periodic backups to safeguard your data, detailed reporting and archiving for tracking performance over time, and advanced AI-driven insights to provide actionable recommendations. These features are designed to deliver a deeper level of analysis and optimization, allowing users to maximize their website’s performance, security, and search engine visibility. Observer is ideal for businesses, agencies, and individuals looking to take control of their website’s health and performance with a powerful, user-friendly tool. Whether you’re just starting or managing multiple websites, Observer provides the tools and insights you need to ensure your site is operating at its best. Unlock the full potential of your website with Observer’s real-time monitoring, in-depth performance analytics, and actionable optimization insights today.
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Observu offers website, server and API monitoring solutions.
Odown is a super easy, simple and reliable uptime monitoring service that can check your websites' and API's issues in real time and notify you through multiple alert channels such as e-mail, sms, slack and webhook, Solve your website' and API's issues before your consumers discover them, this will help you protect your company's reputation and keep your customers happy
OffAlerts offers its users with a reliable way to set up an uptime monitoring service for their website and app. OffAlerts uses a network of ping servers distributed around the globe to monitor the websites. In addition users can create branded status pages for their website / app. OffAlerts offers various monitoring tools such as SSL certificate check, HTTP(s) ICMP & Port protocol checks. Users can setup various request methods such as GET, POST, PUT, PATCH, HEAD & OPTIONS. OffAlerts can notify users instantly through Email, SMS or any other service via our Zapier integration!
Omniwatchguard is a SaaS platform for real-time webpage monitoring, detecting changes like price fluctuations, stock availability, content revisions, CSS alterations, and DOM updates. Its intelligent filtering engine removes irrelevant noise, ensuring notifications highlight significant updates. Powered by Cloudflare's global infrastructure, the platform offers low latency and high availability. Users add a URL and select monitoring types, such as pricing, inventory, text content, DOM structure, or API endpoints. Notifications are sent instantly via email, Slack, Discord, Telegram, or webhooks. Omniwatchguard tracks text, pricing, stock levels, visual changes via pixel-level comparisons, DOM/CSS modifications, API responses, and JavaScript-rendered pages. It also supports legal document updates and SSL certificate alerts. Scanning intervals range from hourly to five-minute checks for enterprise plans, scaling to monitor thousands of URLs without hidden fees or complex setups.
OneAPM Browser Insight is a web performance monitoring platform for statistical analysis of site traffic.
Onsite Link Verdict checks the links on a WordPress site and only calls one broken when it can prove it. A link is reported broken in two cases: the server says the page is gone, 404 or 410, and repeats it on a second request by a different method; or nothing answers, three checks in a row. Everything else goes to a separate tab called Couldn't verify, with the reason in plain English. Servers answer a script differently from the way they answer a browser, and that difference is named for what it is instead of counted as a dead link. It runs on your own server. No account, no cloud, no credits. Nothing runs while a visitor loads a page, and every pass has hard ceilings in the code: 100 links, 45 seconds, 2 KB read per response, one request per unique URL. The free version finds and reports. Pro replaces a URL across every post in one pass, after showing the full list, with an undo, plus CSV export and a silence list. Free on the WordPress plugin directory. Pro from 29 EUR a year.
openstatus is an open-source status page and synthetic monitoring platform that helps engineering teams communicate system health to their users and proactively detect downtime. It is designed for SaaS companies, startups, and development teams who need a reliable way to manage incidents and monitor uptime from a single dashboard. The platform provides customizable, public-facing status pages where teams can publish real-time system status, incident updates, and scheduled maintenance windows. Subscribers can opt in to receive notifications about outages and maintenance, reducing support ticket volume and building trust with end users. Key features include: - Status pages with custom domains — brand your status page with your own domain and customize the look to match your product - Incident and maintenance management — create status reports with component-level updates to keep users informed throughout an incident lifecycle - Subscriber notifications — allow users to subscribe to status updates via email or webhook, with filtering by component - Synthetic monitoring from 28 global regions — monitor websites and APIs with checks as frequent as every 30 seconds, with response time tracking and detailed logs - Multi-channel alerting — receive notifications via Slack, Discord, email, SMS, WhatsApp, PagerDuty, OpsGenie, or Grafana OnCall when a monitor detects an issue openstatus supports team collaboration with unlimited members on paid plans, audit logs, and a REST API for programmatic access. It offers three pricing tiers — a free Hobby plan for personal projects, a Starter plan for growing teams, and a Pro plan for organizations that need global coverage, advanced integrations, and extended data retention. The platform is fully open source, giving teams the option to self-host or use the managed cloud service.
Infrastructure and endpoint monitoring made easy!
PageLantern is website, API, and uptime monitoring software for small teams, agencies, SaaS operators, and website owners. Monitor HTTP/HTTPS endpoints, APIs, SSL certificates, domain expiration, DNS records, TCP services, heartbeat and cron jobs, and critical browser flows from one workspace. PageLantern records response times and availability across multiple locations, creates incidents automatically, routes alerts to team channels, and provides hosted public status pages. The free plan includes 15 monitors, five-minute checks, 30 days of history, one status page, and one alert channel with no credit card required. Paid plans add faster checks, browser monitoring, longer history, additional users, reports, and more status pages.
Pathly is a synthetic monitoring tool that replays real customer journeys (cart, login, checkout) in a real browser. When a step breaks, you get an email with a screenshot of the exact failing step — before your client calls. Includes HTTP uptime checks, multi-step API chains, and EU hosting (GDPR). Free plan with 1 daily journey, no credit card required.
Pathly HQ is website journey monitoring without code. Ping checks HTTP uptime, Flow replays critical user journeys in a real Chrome browser with failure screenshots, and Chain validates multi-step API flows. Built for agencies and e-commerce teams who need more than a green uptime light. Hosted in the EU (europe-west1) with a public GDPR DPA. Free tier available; paid plans from $29/month.
