Know your site is down
before your client does.
Free uptime monitoring with instant WhatsApp, Telegram, Slack & email alerts. Set up your first check in 60 seconds — no credit card.
Free forever plan · No credit card · Set up in 60 seconds
Is my site up? Check any URL instantly
Free 5 checks per hour. Sign up for 24/7 automated monitoring.
The worst way to find out your site is down is a text from your client.
If you build or maintain sites for other people, downtime isn't just a technical problem — it's a trust problem. Every minute you don't know is a minute they might. ismysiteup watches your sites and APIs around the clock and pings you the second something breaks, so you're fixing it before anyone else notices.
Up and running before your coffee's cold
Three steps. Takes less than a minute.
Add a URL or API endpoint
Paste a link. That's the whole setup for a basic check.
Choose where to get alerted
WhatsApp, Telegram, Slack, or email — on every plan, including free.
Get back to work
We check around the clock and only interrupt you when something's actually wrong.
What you get
Everything you need to know your sites are up — and to hear about it first.
Uptime monitoring that actually reaches you
We check your sites around the clock — as often as every 30 seconds — and send the alert the moment one goes down, not five minutes later. Response time and status code included.
A free plan you can actually use
Five monitors, real alerts, no credit card, no 14-day countdown. Start free and stay free until you outgrow it.
Alerts on WhatsApp, Telegram, Slack & email — on every plan
Email's there when you want a paper trail — but we also ping the messaging apps already in your hand, so you actually see the alert. Every channel, free tier included.
Catches problems, not just outages
SSL certificate expiry, domain-name expiry, and slow response times get flagged early — we even remind you in the days and hours before your domain lapses, so none of them become a 2am emergency.
Built for people juggling many sites
Group monitors by client or project, see everything at a glance, and never lose track of which site belongs to whom.
API Client, endpoint tests & Data Monitors
A built-in API client to build and save requests, scheduled endpoint tests with assertions, and Data Monitors that watch a value in your JSON — orders, signups, balance — and alert you when it stalls, even if the page still returns 200.
Monitor your APIs without writing a line of code.
Point us at an endpoint, set what "healthy" means — a 200 status, a response under 500ms, a specific field in the JSON — and we'll watch it like we watch your sites. No CI pipeline, no monitoring degree. Just the alert when it breaks — even when the page still says 200.
Uptime check
200 OK · 180ms ✓
"Looks fine." Nobody gets paged.
Data Monitor
orders/hour: 42 → 0 🔴
Alert fires. You fix it before the client emails.
Included free — no credit card.
You look more reliable when you already know.
When you message a client "we spotted an issue and we're on it" before they've even noticed, you stop looking like the person who broke something and start looking like the person who's always watching. That's what this tool actually sells: not uptime — your reputation.
Simple pricing. Start free.
Every plan watches your business, not just your server. Upgrade when one monitor isn't enough.
Pro
- 10 Data Monitors
- 50 uptime monitors
- API Client & endpoint tests
- All alert channels, no ads
Business
- 50 Data Monitors
- 200 uptime monitors
- API Client & endpoint tests
- All alert channels, no ads
Frequently asked questions
The honest answers, before you sign up.
Is the free plan really free?
Yes. No card, no trial clock. Five uptime monitors, one Data Monitor, and real alerts via WhatsApp, Telegram, Slack, or email — indefinitely.
How fast will I know if something's down?
Between every 30 seconds and every 12 hours depending on your plan and settings (5 minutes on Free, 1 minute on Pro, 30 seconds on Business), with the first alert sent the moment a check fails — not on the next cycle. After that we batch follow-ups so a flapping site can't spam you, then tell you the instant it recovers.
Do I need my own WhatsApp, Telegram, or Slack setup?
You connect your own channels once — WhatsApp via CallMeBot, Telegram and Slack in a couple of clicks. After that, alerts flow straight to you at no per-message cost from us, on every plan.
Can I monitor sites I manage for clients?
That's exactly who this is built for. Organize everything by client or project, watch it all from one dashboard, and message them 'we spotted it and we're on it' before they've even noticed.
Can I check if my website is down right now without signing up?
Yes — paste any URL into the checker at the top of this page and you'll get the HTTP status, response time, and SSL details instantly. No account needed. Sign up (free) when you want it watched 24/7.
What's a Data Monitor?
It watches an actual value in your API — order count, signups, revenue, queue depth — and alerts you when it stalls or moves the wrong way. That's the failure plain uptime checks miss: the page returns 200 while the business quietly stops. You get both here.
What happens when I outgrow the free plan?
You keep everything you've set up. Pro and Business plans add more monitors, faster checks, and more Data Monitors — nothing breaks and nothing migrates when you upgrade.