Just launched @UptimeGuardXYZ last week that matches this exact idea!
Your post is amazing validation - I built precisely what you described: simple uptime monitoring without complexity. Drop a URL, get alerts when things go wrong.
Built it after my own site went down for hours without me knowing. Sometimes the simplest tools solve the most painful problems!
If anyone wants to check it out, it's live now. Thanks for confirming there's demand for this!
https://t.co/bBefqLMgIW