Vibe-coded your app? Don't vibe-code your monitoring.
Holter helps you add the boring production checks your AI builder probably skipped: uptime, SSL, DNS, API health, cron jobs, backups, and alert routing.
No credit card · free plan · up and watching in minutes.
Holter adds the checks your builder skipped
The problem
The AI wrote the app and shipped it fast. What it did not do is tell you when the app breaks. Vibe-coded projects almost always skip the unglamorous production layer — uptime checks, SSL expiry, DNS, dead crons — so the first sign of trouble is a user telling you it is down.
Set up in three steps
Point it at your live app
Add your URL and API endpoint — Holter checks them from the outside, with no code changes.
Cover the invisible parts
Add a heartbeat to your crons, queues, and backups so a silent failure becomes an alert.
Get told, don't get DMed
Route alerts to email, Slack, Discord, or a webhook so you hear it first.
What Holter does
Holter is the production step after vibe coding. It watches your live app the way a user would — is it up, is it fast, is the cert valid — and pings you when a background job stops. You do not need to become an SRE or learn an observability platform; you just need to know when something breaks.
- ✓ Uptime & response-time checks — no code changes, no agent
- ✓ SSL, domain, and DNS — the expiries nobody remembers
- ✓ Heartbeats for the crons and backups your builder set up
- ✓ Alerts to email, Slack, Discord, or a webhook
Simple, transparent pricing
Free covers a freshly launched app's basics with no card. Pro adds faster checks, more monitors, and multi-channel alerts as you grow, from $15/mo.
Free plan needs no card. Every paid plan includes a 14-day free trial.
See full pricingQuestions, answered
Start with your live URL, your API, and your SSL cert. Add a heartbeat for any scheduled job. Holter walks you through each one.
No. Holter watches from the outside; your jobs ping it for the rest. Nothing runs on your servers.
Yes. Connect Holter's MCP server and your agent reads the repo locally to propose monitors — Holter never sees your source.
No. It only ever receives the monitors you (or your agent) create, and the heartbeats your jobs send.
Yes — Free covers up to 5 monitors with no card, which is enough for a newly launched app.
Vibe-coded your app? Don't vibe-code your monitoring.
No credit card required. Free plan available.
Monitor my app