Know the moment something you watch changes.
NotDown watches your websites, background jobs, and any web page around the clock — uptime, cron heartbeats, and page-change alerts in one place. It pings your Discord or Slack the second something breaks or changes, so you hear it from us, not from your users.
Just want to know right now? Check any URL instantly — no signup — or see the live status of GitHub, OpenAI, Anthropic, Cloudflare & more.
Website uptime
We hit your URLs from the edge as often as every minute and track status, latency and uptime %. HTTP, keyword and status-code checks.
Cron & job heartbeats
Give your backups and scheduled jobs a heartbeat URL. If a ping doesn't arrive on time, we alert you — a dead-man's switch for anything.
Page-change alerts
Watch any web page — a price, a restock, docs, a job posting, a competitor — and get pinged when its text changes, with a summary of what changed. No browser extension.
Instant Discord/Slack alerts
Get pinged on Discord, Slack, or any webhook the moment a check fails, recovers, or a watched page changes. No noisy false alarms.
Built for humans & agents
A clean JSON API plus a native MCP server let your scripts and AI agents create and operate monitors themselves. For agents & cron →
Up and running in 60 seconds
No agents to install. No credit card. Just add a check.
Add a check
Paste a URL to monitor, or create a heartbeat for a cron job. Set how often it should run.
Connect alerts
Drop in a Discord or Slack webhook (or your own endpoint). Optional but recommended.
Relax
We watch continuously and only bother you when something actually changes.
Share a public status page
Flip any monitor to "public" and get a clean, shareable status page at /status/your-name — no extra setup, no separate product.
Perfect for cron jobs
Add one line to any scheduled task. If it stops pinging, you'll know.
# In your crontab — ping NotDown after a successful backup 0 3 * * * /usr/local/bin/backup.sh && curl -fsS https://notdown.example/ping/YOUR-KEY
Is a popular service down right now?
Before you blame your own code, check the live status board — real-time up/down plus 24-hour uptime and a recent-incidents timeline for the services developers and AI agents depend on: GitHub, OpenAI, Anthropic, Cloudflare, Stripe, Discord, Vercel, Supabase and more. There's also a free, no-key public status JSON API your scripts and agents can poll.