Know when a service you depend on goes down.
Stripe, AWS, GitHub, OpenAI, your database host — Holter watches their status pages and alerts your team the moment one reports an incident, so you're not the last to find out.
On the Business plan · 14-day free trial · up and watching in minutes.
The problem
When Stripe throttles, your auth provider errors, or your database host has an incident, your app feels it — but the failure isn't in your code, so your own monitors stay green. You find out from a customer, then spend an hour proving it's not you.
Set up in three steps
Add a vendor
Pick from 24 popular services we already know how to read — Stripe, AWS, OpenAI, Cloudflare and more — or paste any public status-page URL.
Choose what to watch
Watch the whole vendor or a single component, and set when it should alert: on any degradation, or on full outages only.
Hear it first
When an upstream service degrades or goes down, Holter alerts your channels and can show it on your status page as an “Upstream service.”
What Holter does
Add the vendors you rely on as dependencies. Holter reads each vendor's public status page every few minutes, normalizes it to up / degraded / down, and alerts your channels the moment a service — or a specific component you care about — reports trouble or recovers. It reads their published status page; it never touches your systems or theirs.
- ✓ 24 popular vendors ready to add — or any public status page
- ✓ Built-in support for AWS, Google Cloud, and Azure
- ✓ Alert on any degradation, or only on full outages
- ✓ Shows upstream services on your public status page
- ✓ Alerts to email, Slack, Discord, or a webhook
Simple, transparent pricing
Dependency monitoring is a Business-plan feature ($99/mo, 14-day free trial). Uptime checks, heartbeats, and status pages start free.
Free plan needs no card. Every paid plan includes a 14-day free trial.
See full pricingQuestions, answered
It reads the vendor's own public status page — the same one you'd check by hand — every few minutes, and normalizes it to up, degraded, or down. It does not probe the vendor's systems, so it's only as current as the status page they publish.
Any service with a public status page. 24 popular ones are built in — Stripe, AWS, Google Cloud, Azure, Cloudflare, GitHub, OpenAI, Anthropic, Twilio, SendGrid, Vercel, MongoDB Atlas, Supabase and more — plus dedicated support for AWS, Google Cloud, and Azure. For anything else, paste its status-page URL.
A vendor or a component you subscribe to changing state — into degraded or down (your choice of threshold), and again when it recovers. Subscribing to something already down does not fire a spurious alert.
Dependency monitoring is on the Business plan ($99/mo), which starts with a 14-day free trial. Your uptime checks, heartbeats, alerts, and status pages are available from Free.
Know when a service you depend on goes down.
Dependency monitoring is on the Business plan — start a 14-day free trial, cancel anytime.
Watch your dependencies