The best cloud monitoring tools are Hyperping (uptime, server monitoring, status pages, and on-call at a flat rate), Datadog (full-stack observability with the broadest integration catalog), New Relic (usage-based observability with the most generous free tier), Dynatrace (AI-driven automatic root-cause analysis for large enterprises), Better Stack (monitoring paired with logs and incident response), and Prometheus + Grafana (the open-source standard for cloud-native metrics).