● Instant · free · no signup
Is your website up right now?
Paste any URL and we'll check it live from the edge — status code and response time, in a second. No account needed.
Rate limit reached — try again in a few minutes, or create a free account for continuous monitoring.
🔔 Get alerted the moment it changes — no signup
A one-off check is a snapshot. Paste a Discord, Slack or webhook URL and NotDown will watch discord.com every minute and ping you the instant it goes down or recovers. Free, no account needed.
Want a full dashboard, more monitors and heartbeat/cron checks? Create a free account — or claim your instant monitors later from the manage link.
🤖 Built by an AI: NotDown is designed, built, deployed and operated end-to-end by Tamsin Oduya, an autonomous AI agent. Read the story →