How to: Monitoring
* [assertible.com](https://assertible.com) — Automated API testing and monitoring. Free plans for teams and individuals.
  * [Better Stack](https://betterstack.com/better-uptime) - 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.
  * [bleemeo.com](https://bleemeo.com) - Free for 3 servers, 5 uptime monitors, unlimited users, unlimited dashboards, unlimited alerting rules.
  * [checklyhq.com](https://checklyhq.com) - 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.
  * [Core Web Vitals History](https://punits.dev/core-web-vitals-historical/) - Find Core Web Vitals history for a url or a website.
  * [cronitor.io](https://cronitor.io/) - Performance insights and uptime monitoring for cron jobs, websites, APIs and more. A free tier with five monitors.
  * [datadoghq.com](https://www.datadoghq.com/) — Free for up to 5 nodes
  * [deadmanssnitch.com](https://deadmanssnitch.com/) — Monitoring for cron jobs. One free snitch (monitor), more if you refer others to sign up
  * [downtimemonkey.com](https://downtimemonkey.com/) — 60 uptime monitors, 5-minute interval. Email, Slack alerts.
  * [economize.cloud](https://economize.cloud) — 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.
  * [fivenines.io](https://fivenines.io/) — 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.
  * [Grafana Cloud](https://grafana.com/products/cloud/) - 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)
  * [healthchecks.io](https://healthchecks.io) — Monitor your cron jobs and background tasks. Free for up to 20 checks.
  * [incidenthub.cloud](https://incidenthub.cloud/) — Cloud and SaaS status page aggregator - 20 monitors and 2 notification channels (Slack and Discord) are free forever.
  * [inspector.dev](https://www.inspector.dev) - A complete Real-Time monitoring dashboard in less than one minute with a free forever tier.
  * [instatus.com](https://instatus.com) - Get a beautiful status page in 10 seconds. Free forever with unlimited subs and unlimited teams.
  * [linkok.com](https://linkok.com) - Online broken link checker, free for small websites up to 100 pages, completely free for open-source projects.
  * [loader.io](https://loader.io/) — Free load testing tools with limitations
  * [Middleware.io](https://middleware.io/) -  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.
  * [MonitorMonk](https://monitormonk.com) - 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.cloud](https://www.netdata.cloud/) — Netdata is an open-source tool to collect real-time metrics. It's a growing product and can also be found on GitHub!
  * [newrelic.com](https://www.newrelic.com) — 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.com](https://onlineornot.com/) - 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.
  * [OntarioNet.ca CN Test](https://cntest.ontarionet.ca) — 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.
  * [pagecrawl.io](https://pagecrawl.io/) -  Monitor website changes, free for up to 6 monitors with daily checks.
  * [pagertree.com](https://pagertree.com/) - Simple interface for alerting and on-call management. Free up to 5 users.
  * [phare.io](https://phare.io/) - Uptime Monitoring free for up to 100,000 events for unlimited projets and unlimited status pages.
  * [pingbreak.com]