Uptime and synthetic monitoring
Check sites and APIs from outside: HTTP, ping, port, TLS certificate and keyword checks, and scripted browser or API journeys.
Read first: What to alert on.
Lists: Uptime monitoring tools in 2026 Best uptime monitoring tools in 2026 Open source uptime monitoring tools in 2026 Uptime monitoring tools with a free plan in 2026 Self-hosted uptime monitoring tools in 2026
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On-call rosters, escalation policies and paging by mobile push, SMS, WhatsApp, Telegram, Slack and email, with uptime, heartbeat and SSL checks and hosted status pages. Priced per server rather than per user.
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API testing and monitoring: define HTTP requests with assertions, run them on a schedule or after each deploy, and get alerted when a check fails.
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Observability suite that pairs uptime checks, logs and metrics with on-call schedules, escalation policies, phone and SMS alerts and hosted status pages.
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Prometheus exporter that probes endpoints over HTTP, HTTPS, DNS, TCP, ICMP and gRPC and exposes the results as metrics you can alert on.
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Enterprise internet performance monitoring: synthetic tests run from backbone, cloud and ISP nodes worldwide, alongside real user and BGP monitoring.
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Self-hosted open source monitor for HTTP, ping, TCP and DNS uptime, server metrics and SSL expiry, with incident tracking and public status pages.
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Synthetic monitoring for developers: API checks and Playwright browser checks written as code, deployed from CI and run from many regions.
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Self-hosted open source monitor from BlueWave Labs for HTTP, ping, TCP port, DNS, WebSocket and gRPC checks, with an optional agent for server hardware metrics and status pages.
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Active prober that started at Google: runs HTTP, DNS, ping, TCP, gRPC and custom probes and exports latency and success metrics to Prometheus and other backends.
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Synthetic monitoring for websites, web applications, APIs and servers, including recorded multi-step browser transactions and load testing.
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Website uptime monitoring with downtime alerts and a generous free plan, aimed at small sites and people watching many client websites.
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Uptime, SSL, DNS and page-content monitoring that confirms an outage from several regions before alerting, with cron checks and status pages.
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Health dashboard configured in YAML: checks HTTP, TCP, DNS, ICMP and other endpoints against conditions on status, body and latency, and alerts to many channels. Also sold as a hosted service.
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Uptime monitoring for websites and servers checked every minute from 12 locations, with an optional server agent, status pages and IP/domain blacklist monitoring.
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Uptime, browser and cron job monitoring bundled with status pages and incident updates, plus a small server monitoring agent.
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Self-hosted uptime and SSL certificate monitor with brandable public or private status pages, maintenance windows and alerts to common chat and email channels.
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Uptime, SSL, domain, cron and agent-based server monitoring aimed at agencies, with client-facing status pages.
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Command-line synthetic monitor from Hyperjump: define HTTP, TCP, ping and database probes in a YAML file, run them anywhere, and send alerts to many channels.
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Uptime monitoring for websites and API endpoints with SSL, keyword, HTTP status and response-time checks, plus shareable dashboards.
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Server and website monitoring with many check types such as HTTP, DNS, SMTP, SSH and TCP ports, confirmed from multiple locations before alerting.
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Website monitoring that covers uptime, SSL certificates, broken links, mixed content, DNS, cron jobs and Lighthouse scores, with status pages.
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Uptime monitoring for websites and APIs, browser checks, cron job heartbeats and status pages, run by a small independent team.
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Self-hosted uptime monitor written in Go with a React UI, built as an alternative to Uptime Kuma, with status pages and pluggable notification channels.
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Uptime monitoring with incident management and status pages, billed by the number of check requests rather than per monitor.
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SolarWinds website monitoring: uptime and multi-step transaction checks from global probes, plus real user monitoring of page performance.
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Uptime monitoring for HTTP, HTTPS, SSH and custom TCP ports, with SMS and voice alerts on paid plans.
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Website uptime and SSL monitoring with status pages, incident notes and pay-per-alert SMS and phone calls.
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Uptime monitoring with HTTP, browser, DNS and domain checks and status pages, built for larger projects with many teams.
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Zoho's monitoring suite for websites, servers, networks, applications and cloud, with synthetic transactions and RUM; plain uptime checks have a free plan.
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Website monitoring with uptime, page speed, domain and SSL checks from test locations around the world.
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Uptime, domain, SSL and server monitoring from DiCloud, with status pages and downtime alerts.
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Cisco's network and internet visibility service: synthetic tests from cloud and enterprise agents trace the network path to your apps and SaaS providers.
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Pay-as-you-go website monitoring with HTTP, SSL and Apdex tracking, public status pages, and alerts by email, SMS and webhooks.
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Self-hosted monitor for HTTP, keyword, TCP, ping, DNS, Docker and push checks, with status pages and dozens of notification integrations.
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Uptime and transaction monitoring with API and page speed checks, real user monitoring, status pages and SLA reporting.
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Serverless uptime monitor and status page that runs on Cloudflare Workers, checking HTTP and TCP endpoints and sending notifications.
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Uptime, SSL and domain monitoring with a customizable status page and email and Telegram alerts, free plan allowed for commercial use.
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Uptime monitoring for websites, APIs, ports, ping, keywords, SSL, DNS and cron heartbeats, with status pages and team alerting.
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Website, API and multi-step transaction monitoring from a global checkpoint network, plus real user monitoring.
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Uptime monitoring plus agent-based Linux and Windows server monitoring, with status pages and SMS or phone call alerts.
No tools match every filter. to see the full list.