UptimeRobot is a website monitoring service with a forever free plan that lets you register with just an email and monitor up to 50 websites, servers, or keywords with 5-minute intervals. Setup takes only a few clicks.
For faster checks and advanced features, paid plans offer 1-minute or 30-second intervals, along with SSL certificate, domain expiry, and heartbeat (cron job) monitoring. You can also create up to 100 status pages, customize them to match your brand, protect them with a password, and allow subscribers to receive updates.
Get notified instantly via email, SMS, voice calls, or integrations with Slack, Zapier, PagerDuty, Splunk On-Call, Telegram, Webhooks, Discord, Mattermost, Pushbullet, Microsoft Teams, Google Chat, Pushover, and more. Mobile push notifications are available through the iOS and Android apps.
Other features include maintenance windows, incident tracking with root cause analysis, tags, comments, and filters. Share account with other team members.
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Overmonitor is cloud-based infrastructure, website, and endpoint monitoring built for teams that want fast setup without enterprise complexity. Monitor websites, servers, processes, Windows services, event logs, uptime, response time, SSL certificates, and internal network health from a lightweight 2.1 MB agent that reports a heartbeat every minute. Configure checks quickly, target monitoring by city-level geography, define maintenance windows that actually suppress noise, and receive alerts through push notifications and audible dashboards. Overmonitor includes process rollups, embeddable performance graphs, endpoint health visibility, and flexible à la carte pricing so you only pay for the monitoring you need. Use Overmonitor to detect outages, analyze website performance, track server availability, and improve end-user experience before small issues become downtime.
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upsonar.io
Most uptime monitors only check if your server responds. upsonar goes further — it loads your page and discovers every external dependency: CDN-hosted files, third-party scripts, web fonts, and API endpoints. If any of them fail, you get alerted before your users notice.
Availability checks run from multiple global regions simultaneously, so regional CDN failures and localized outages don't go undetected. Beyond uptime, upsonar monitors SSL certificates approaching expiration, tracks domain expiry dates to prevent renewal failures, and detects DNS record changes that could indicate unauthorized modifications.
All five monitoring types work together in one dashboard. Notifications reach you through email, Telegram, or webhooks compatible with Slack, Discord, and PagerDuty. Get started free with 3 websites — all features included, no credit card needed.
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