Monitor every client site from one dashboard.
Freelancers and agencies: watch all your client sites, certs, and domains in one place, and get alerted the moment one goes down — before the client does.
No credit card · free plan · up and watching in minutes.
The problem
You maintain a dozen sites across different clients, hosts, and stacks. You can't watch them all — so the first sign a client site is down is usually the client's email. And SSL certs and domains expire on accounts you don't log into daily.
Set up in three steps
Add each client site
Paste each site's URL — Holter checks it from the outside, with no agent or code on the client's server.
Get alerted first
When any site goes down or a cert nears expiry, Holter alerts you via email, Slack, Discord, or a webhook — before the client notices.
Give clients a status page
Publish a branded status page for your key clients, on their own domain, updated automatically from that client's monitors.
What Holter does
Holter puts every client site in one dashboard. Add each site's URL and Holter checks it from the outside — uptime, response time, SSL, domain, DNS — and alerts you the moment any one drops. Give key clients a branded status page on their own domain so they can check for themselves.
- ✓ Every client site, certificate, and domain in one dashboard
- ✓ Alerts the moment any site drops — you hear it first
- ✓ Branded status pages on custom domains — up to 10 on Pro, 25 on Business
- ✓ Add a site in a minute — no agent, no client-side code
Simple, transparent pricing
Free includes 5 monitors — a basic uptime check on a few sites, or a fuller set of checks (SSL, DNS, redirect) on one. Pro (up to 100 monitors) and Business (up to 500) scale with your client book — with custom-domain status pages on Pro — from $15/mo.
Free plan needs no card. Every paid plan includes a 14-day free trial.
See full pricingQuestions, answered
Free covers up to 5 monitors; Pro raises the limit to 100 and Business to 500 — plenty for a growing book of client sites.
No. Holter checks each site from the public internet, so you only need the URL. Nothing runs on the client's server.
Yes — a branded status page on their own custom domain, on Pro. Pro includes up to 10 status pages and Business up to 25, each updated automatically from that client's monitors.
Holter checks on a schedule you control and alerts you the instant a site fails a check — to email, Slack, Discord, or a webhook.
No. Free covers up to 5 monitors with no card.
Monitor every client site from one dashboard.
No credit card required. Free plan available.
Watch my client sites