监控 Monitoring

Free tier offers 1 uptime/API monitor with 15-minute check intervals and instant email alerts.

Accesserty Pulse monitors interaction signals and detectable accessibility risks on live websites. Free plans for everyone and 14-day Pro trial.

server security (eBPF agent for Linux), uptime monitoring, on-call alerting/status pages in one product. Free tier includes 10 uptime monitors and heartbeats, 5-minute check intervals, 7-day retention.

Automated API testing and monitoring. Free plans for teams and individuals.

Uptime monitoring, incident management, on-call scheduling/alerting, and status pages in a single product. The free plan includes ten monitors with 3-minute check frequency and status pages.

Free for 3 servers, 5 uptime monitors, unlimited users, unlimited dashboards, unlimited alerting rules.

Open source E2E / Synthetic monitoring and deep API monitoring for developers. Free plan with one user and 10k API & network / 1.5k browser check runs.

Find Core Web Vitals history for a url or a website.

Heartbeat monitoring for cron jobs, plus HTTP uptime and TLS expiry checks, and a Laravel package that creates checks from your scheduler. Free tier with 10 checks, HTTP interval from 5 min, 30 days of history, 50k pings/mo.

Performance insights and uptime monitoring for cron jobs, websites, APIs and more. A free tier with five monitors.

Cron job monitoring with heartbeat pings and alerts. Free tier with up to 5 monitors and email notifications.

Free for up to 5 nodes

Rails APM with request-based pricing: live traces, slow SQL, N+1 detection, and error tracking. Free forever for 50k requests/month, 7-day retention, 1 app, 1 uptime check, and email alerts. No credit card required.

Monitoring for cron jobs. One free snitch (monitor), more if you refer others to sign up

60 uptime monitors, 5-minute interval. Email, Slack alerts.

Cron, heartbeat, and uptime monitoring with incident management and status pages. Free for up to 50 monitors with 1-min interval and unlimited team seats.

Economize helps demystify cloud infrastructure costs by organizing cloud resources to optimize and report the same. Free for up to $5,000 spent on Google Cloud Platform every month.

Linux server monitoring with real‑time dashboards and alerting - free forever for up to 5 monitored servers at 60-seconds interval. No credit card required.

Uptime, content, dependency, and SSL monitoring with multi-region verification and status pages. Free plan includes 15 monitors, 5-minute checks, and 90 days of history.

Grafana Cloud is a composable observability platform that integrates metrics and logs with Grafana. Free: 3 users, ten dashboards, 100 alerts, metrics storage in Prometheus and Graphite (10,000 series, 14 days retention), logs storage in Loki (50 GB of logs, 14 days retention)

Monitor your cron jobs and background tasks. Free for up to 20 checks.

Cloud and SaaS status page aggregator - 20 monitors and 2 notification channels (Slack and Discord) are free forever.

A complete Real-Time monitoring dashboard in less than one minute with a free forever tier.

Get a beautiful status page in 10 seconds. Free forever with unlimited subs and unlimited teams. isitdownstatus.com – Free public JSON API returning real-time status for 500+ popular services (GitHub, Stripe, AWS, etc.). No auth required, CORS enabled.

Dead man's switch for AI agents, cron jobs and CI. Free for individuals with unlimited monitors and destinations. Let AI agents build monitoring for everything including themselves.

Online broken link checker, free for small websites up to 100 pages, completely free for open-source projects.

Free load testing tools with limitations

Server monitoring, public status pages, and service uptime monitoring.

Middleware observability platform provides complete visibility into your apps & stack, so you can monitor & diagnose issues at scale. They have a free forever plan for Dev community use that allows Log monitoring for up to 1M log events, Infrastructure monitoring & APM for up to 2 hosts.

Server health monitoring for Linux (bare metal, VMs, LXC): host and Docker metrics, systemd services and SMART disk health, with alerting, OpenTelemetry Collector agent. Free for 3 servers, no card required.

Minimalist uptime monitoring with beautiful status pages. The Forever Free plan offers HTTPS, Keyword, SSL and Response-time monitorming for 10 websites or api-endpoints, and provides 2 dashboards/status pages.

Netdata is an open-source tool to collect real-time metrics. It's a growing product and can also be found on GitHub!

New Relic observability platform built to help engineers create more perfect software. From monoliths to serverless, you can instrument everything and then analyze, troubleshoot, and optimize your entire software stack. The free tier offers 100GB/month of free data ingest, one free full-access user, and unlimited free primary users.

OnlineOrNot provides uptime monitoring for websites and APIs, monitoring for cron jobs and scheduled tasks. Also provides status pages. The first five checks with a 3-minute interval are free. The free tier sends alerts via Slack, Discord, and Email.

Check if a website is blocked in China by the Great Firewall. It identifies DNS pollution by comparing DNS results and ASN information detected by servers in China versus servers in the United States.

Hosted uptime monitoring and status pages. Free tier includes 3 active monitors with 5-minute check intervals, 26,000 checks and 100 emails per month, and 30 days of check history.

Monitor website changes, free for up to 6 monitors with daily checks.

Simple interface for alerting and on-call management. Free up to 5 users.

Uptime Monitoring free for up to 100,000 events for unlimited projects and unlimited status pages.

Modern uptime monitoring service. Check unlimited URLs and get downtime notifications via Discord, Slack, or email.

5 uptime monitors with 10-minute interval. Monitor SSH, HTTP, HTTPS, and any custom TCP ports.

Advanced status page platform with monitoring. The free tier includes one public customizable status page with an SSL subdomain. Pro plan is offered to open-source projects and non-profits free of charge.

Free REST API (GET /api/v1/statuses) returning real-time operational status for 75+ AI services including OpenAI, Anthropic, Gemini, Mistral, and more. No authentication required. [Free tier available with Pro at $10/month]

10 monitors, 6 Months of historical Uptime/Logs, unlimited status pages, and custom domains included! For infinite time and unlimited email alerts for free. You don't need a credit card.

Continuous website monitoring - Relvato rechecks all your site vitals (performance, critical user journeys, visual design, security, SEO, legal compliance, accessibility etc) after every code update. Free for one site, no card needed. MCP also available.

Powerful Kubernetes monitoring based on Prometheus. Bring your own Prometheus or install the all-in-one bundle. The free tier includes up to 20 Kubernetes nodes. Alerts via Slack, Microsoft Teams, Discord, and more. Integrations with PagerDuty, OpsGenie, VictorOps, DataDog, and many other tools.

On-call alerting, incident management, and public/private status pages. The free plan includes up to 5 users, 1 team, 1 on-call schedule, basic status pages, incident lifecycle, and Slack-native incident response.

Advanced uptime monitoring with support for large projects and teams. Provides HTTP monitoring, Browser based monitoring, DNS monitoring, domain monitoring, status pages and more. The free tier includes 10 HTTP monitors, 1 DNS monitor and one status page.

Powerful server monitoring in a unified platform for metrics and logs, with no setup complexity. Free for one server.

Website and cron monitoring - 2 monitors free

Free for first 100,000 requests (Rails only)

Website monitoring, unlimited tests free with limitations

Status page monitoring, 3 monitors free

Synthetic monitoring from 20+ global regions. The free tier includes 1,000 browser checks/mo with AI-driven self-healing and automated test generation.

Open-source OpenTelemetry observability (traces, logs, and metrics) with AI-agent incident investigation. The free tier includes 1M spans, 5M logs, and 10M metric points per month with 30-day retention, no credit card required. Fully open-source and self-hostable.

Server monitoring, uptime monitoring, DNS & domain monitoring. Monitor 10 server, 10 uptime, and 10 domain for free.

Noncommercial free server monitoring service, alerts and metrics.

Get 20 uptime monitors with 5-minute intervals and a customizable status page-even for commercial use. Enjoy unlimited, real-time notifications via email and Telegram. No credit card needed to get started.

Free monitoring for five websites, 3-minute intervals, public statuspage.

monitor five pages, checks every 24 hours.

Cron job and heartbeat monitoring and status pages for scheduled tasks, backups and background jobs, MCP server available. Free tier: 10 checks, 200 ping log entries, email/chat/webhook alerts, no credit card. Open Source support program for qualifying OS projects.

Uptime monitoring: 20 free, Linux and Windows Server monitoring: 5 free, Status page: 1 free - Mobile app, multiple notification channel, and much more!

Free uptime monitoring for hobby projects. Includes 50 monitors with 5-minute check intervals, supports HTTP, ping, port, and keyword monitoring.