One curl and your phone buzzes. Ack it, fix it, close it. Send from a script, a cron job or your monitoring: no setup, no ads, free for personal use. Businesses get teams, groups, on-call and escalation, without the complexity of PagerDuty or OpsGenie.
curl -H 'X-ZapaPush-Key: YOUR_KEY' \ -d 'Disk full: /var is 95% used' https://api.zapapush.com/send
SWITCH50, paid yearly in advance.ZapaPUSH accepts PagerDuty's and OpsGenie's own alert formats, so moving a tool over means changing one URL and key. There are step-by-step migration guides, and a tutorial for every integration (Prometheus Alertmanager, Grafana, AWS, Google Cloud, Azure, email, webhooks, heartbeats), in the docs.